Invited Speakers

Nanophotonic Materials and Devices

Dr. Igor I. Smolyaninov

Gradient Dynamics LLC, USA

Title and Abstract

Title:

Hyperbolic Metamaterials

Abstract:

Hyperbolic metamaterials were originally introduced to overcome the diffraction limit of optical imaging. Soon thereafter it was realized that hyperbolic metamaterials demonstrate a number of novel phenomena resulting from the broadband singular behavior of their density of photonic states. These novel phenomena and applications include super resolution imaging, new stealth technologies, enhanced quantum-electrodynamic effects, thermal hyperconductivity, superconductivity, and interesting gravitation theory analogues. I will review typical material systems, which exhibit hyperbolic behavior and outline important applications of hyperbolic metamaterials.

Prof. Hiroaki Misawa

Hokkaido University, Japan

Title and Abstract

Title:

Abstract:

Prof. Jeroen Beeckman

Ghent University, Belgium

Title and Abstract

Title:

Integrated optical pure phase modulators based on PZT thin films

Abstract:

We report on fast electro-optic modulation using hybrid integration of ferroelectric thin films on the SiN photonic platform. Efficient and high-speed modulation is made possible thanks to the high-quality deposition of a thin film of lead zirconate titanate onto the SiN photonic chip.

Optical Waveguides and Communications

Prof. Wei-Ren, Peng

Futurewei Technologies Inc., USA

Title and Abstract

Title:

Coding and shaping for digital optical communications

Abstract:

Coding and signal shaping are the keys enabling next generation high-speed optical communication. We will describe our recent works on this topic.

Dr. Hidenori Takahashi

KDDI Research Inc., Japan

Title and Abstract

Title:

Spatial division multiplexing (SDM) for next-generation ultra-high capacity optical transmission system

Abstract:

Spatial division multiplexing (SDM) is a promising technology to dramatically extend transmission capacity for next-generation optical transmission systems. To date, the latest transmission capacity reached to 10 petabits per second using over 100 spatial channels. We will review the latest trends and present our recent activities on SDM.

Prof. Morten Ibsen

Southampton University, UK

Title and Abstract

Title:

Optical Signal-generation, -control and -manipulation with Periodic All-fibre Devices

Abstract:

The concept of periodic fibre devices typically cover structures that are periodic in refractive index (fibre Bragg gratings and long period fibre gratings), or nonlinearity ((2) fibre gratings). We will discuss the latest advances in the use of either of these fibre device-concepts for controlling and manipulating the phase and amplitude properties of light. We will discuss examples of grating designs to generate highly coherent light with very narrow linewidth, typically sub-kHz, for applications requiring low noise and long coherence length. We will also demonstrate grating designs capable of achieving wavelength-conversion well in excess of 100nm and designs for generating efficient frequency doubling to reach wavelength bands that are not readily available from the use of conventional rare-earth doped systems. With the efficiency of the device concepts to some extent relying on the nonlinearity of the host material, we will also discuss some possible future directions of these device concepts as their designs migrate from being formed in silica based fibres into more exotic material platforms such as chalcogenides, fluorides and tellurites.

Quantum Electronics and Laser Technology

Prof. Ju Han Lee

University of Seoul, South Korea

Title and Abstract

Title:

Topological Insulators for 2-μm Pulsed Fiber Lasers

Abstract:

I review our group’s recent investigation results on the use of a saturable absorber based on bulk-structured topological insulators for the implementation of pulsed fiber lasers in the 2 μm spectral region. Our research focus was given to Bi2Te3 and filled skutterudite of In0.25Co4Sb12.

Prof. Yung Fu Chen

National Chiao Tung University, Taiwan

Title and Abstract

Title:

Broad expansion of optical frequency combs by self-Raman scattering in coupled-cavity self-mode-locked monolithic lasers

Y. F. Chen1, M. T. Chang1, H. C. Liang2  and K. W. Su1
1Department of Electrophysics, National Chiao Tung University, 1001 Ta-Hsueh Rd. Hsinchu 300, Taiwan
2Institute of Optoelectronic Science, National Taiwan Ocean University, Keelung 20224, Taiwan

Main author email address: yfchen@cc.nctu.edu.tw

Abstract:

In this work we numerically analyze and experimentally accomplish the broad expansion the optical frequency comb (OFC) by the self-Raman scattering in a coupled-cavity self-mode-locked (SML) monolithic Yb:KGW laser [1,2]. We firstly design a coated Yb:KGW crystal to generate the OFC in the SML operation. The crystal length shorter than 3.00 mm is used to avoid significant re-absorption losses. With a crystal length of 2.93 mm, the SML repetition rate of 25.78 GHz is obtained. We then employ a partially reflective mirror to form a coupled cavity that was set to multiply the repetition rate to reach 128.9 GHz. Furthermore, the critical value of the coupled reflectivity for the generation of self-Raman scattering is systematically explored and found to be approximately 90%. Experimental results reveal that a coupled reflectivity of 95% can lead to the generation of the first- and second-order SRS in the gain medium at the lowest frequency mode. As a result, the OFC can be expanded up to 8.4 THz with the pulse width down to 53 fs, as shown in Fig. 1. The total output power for the fundamental and the Stokes waves can achieve 1.6 W at a pump power of 8.7 W. Previously, several groups demonstrated sub-100 fs Yb:KGW mode-locked lasers with the action of a semiconductor saturable absorber mirror (SESAM) or Kerr-lens. The repetition rates in these earlier works were in the range of 30-80 MHz, whereas the present method can generate the repetition rate greater than 100 GHz. Our exploration confirms that the optical spectra generated by the SML and SRS process can be linked together to obtain an ultrahigh-repetition-rate broadband OFC. 

[1] Y. F. Chen, M. T. Chang, W. Z. Zhang, K. W. Su, K. F. Huang, and H. C. Liang, “Generation of sub-terahertz repetition rates from a monolithic self-mode-locked laser coupled with an external Fabry-Perot cavity,” Laser Photonics Rev. 9, 91−97 (2015).
[2] C. Y. Lee, C. C. Chang, H. C. Liang and Y. F. Chen, “Frequency comb expansion in a monolithic self-mode-locked laser concurrent with stimulated Raman scattering,” Laser Photonics Rev. 8, 750−755 (2014).

Prof. Iam-Choon Khoo

The Pennsylvania State University, USA

Title and Abstract

Title:

Liquid crystalline organic photonic crystals for direct all-optical compression and modulation of ultrafast laser pulses

Abstract:

We report successful fabrication of well aligned cholesteric liquid crystal cells of record-setting thickness, and critically examine the role played by band-edge dispersion and enhanced ultrafast electronic optical nonlinearity in recent successful observations of direct femtosecond laser pulse modulations and group velocity slow-down.

Prof. Claudio Conti

Institute for Complex Systems of the National Research Council, Italy

Title and Abstract

Title:

Topological cascade lasers

Abstract:

Topological lasers are novel integrated light sources that are intrinsically robust with respect to perturbations, as fabrication imperfections, thermal and mechanical stress. We study theoretically and numerically the laser emission from one-dimensional topologically protected states in the so-called Aubry-Andre-Harper model. We report the first finite-difference time-domain Maxwell-Bloch simulations of topological lasers, and also consider a PT-symmetry breaking gain/loss distribution. We show that an engineered cascade of onedimensional devices with varying topological features realizes an integrated source emitting a frequency-comb with tunable spectral features. These topological cascades are a new concept that opens the road to many applications as in metrology, sensing and quantum tehcnologies.

Holography and Information Processing

Prof. Olivier Haeberl

University of Haute-Alsace, France

Title and Abstract

Title:

Tomographic diffractive microscopy: a technique for high-speed, high-resolution and quantitative imaging of unlabelled specimen

Abstract:

Optical microscopy techniques to observe unlabeled samples have recently known a regain of interest. Tomographic diffractive microscopy, to reconstruct images of the observed sample, uses numerical inversion of the diffracted field. This technique has the potential for high-speed imaging of unmarked samples, at higher resolution than conventional microscopes.

Prof. Nikolay V. Petrov

ITMO University, Russia

Title and Abstract

Title:

Pulse Holographic Imaging in Visible and Terahertz Frequency Ranges

Abstract:

In this communication I will describe the methodology of some pulsed holographic imaging approaches for visible and terahertz radiation which operate in the nanosecond-femtosecond timescales. The possibilities and limitations of these time-resolved techniques as well as the solutions to overcome the restrictions will be discussed.

Prof. Yoshio Hayasaki

Utsunomiya University, Japan

Title and Abstract

Title:

Volumetric bubble display with holographic drawing and ultrasonic erasing

Abstract:

A volumetric display with microbubble voxels are three-dimensionally generated in a liquid by focused femtosecond laser pulses. A use of high-viscosity liquid slows down the movement of the microbubbles, and the volumetric graphics can be displayed. This “volumetric bubble display” has a wide viewing angle and simple refresh, and requires no addressing wires. An erasing of the bubble graphics using an ultrasonic vibrator has been also demonstrated.

Optical Design and Testing

Prof. Chung Hao Tien

National Chiao Tung University, Taiwan

Title and Abstract

Title:

Measuring the randomness of light fields

Abstract:

Image formation is a random process. The theory of random processes deals with the mathematical description of temporal (or spatial) functions having a structure that cannot be determined in advance. For optics, the wave amplitude emitted by any practical source has properties that change with time and space to some degree. Based on the Van Cittert–Zernike theorem, in this work we reviewed and examined the basic concepts underlying the theory of the coherence phenomena of light fields through a double-slit and grating interference experiment. This work would be expected to have an impact in the realm of lithography, information optics or partial coherence imaging analysis.

Prof. Le-Minh Hoa

Northumbria University, UK

Title and Abstract

Title:

Multiple input multiple output (MIMO) visible light communications – Design and Testing

Abstract:

Office and home lighting sources are currently evolving through the traditional fluorescent and incandescent sources to the modern energy saving light bulbs and now white light emitting diodes (LEDs). This trend has been spurred on through global awareness of the necessity for reducing the size of our carbon footprint. The introduction of solid state LED lighting has attracted the attention of communications engineer’s worldwide, enabling the achievement of the dual functionality of room illumination whilst simultaneously transmitting wireless data via visible light communication (VLC). This technology offers advantages over the traditional wireless radio frequency (RF) communications system because of the signal quality, license free spectrum it occupies and data security. In order to achieve moderately uniform illumination within homes and offices, it is a common practice to use multiple LED lighting units. From the VLC viewpoint, these lighting units can be used as multiple transmitters each transmitting independent data streams, which forms the multiple-input-multiple-output (MIMO) system. MIMO VLC technique for visible light communications (VLC) facilitates higher data rate thanks to parallel data transmission.The talk will discuss on MIMO VLC technology, including system and sub-system design and testing, and further extend to the security, channel estimation features and camera-based VLC.

Biophotonics and Biomedical Imaging

Prof. Tomoyuki Yokota

University of Tokyo, Japan

Title and Abstract

Title:

Ultra-flexible organic photonic devices

Abstract:

Recently, we have fabricated 1-µm-thick ultra-flexible and lightweight organic electronics, such as organic solar cell, organic polymer light-emitting diodes and organic transistor. These electronics exhibit extraordinarily tough mechanical robustness such as minimum bending radius of 5 μm. By integrating ultra-flexible green and red PLEDs with an OPD, a flexible and conformable reflective pulse oximetry has been demonstrated. In order to detect pulse waves and blood oxygen levels, the device was turned over and wrapped around a finger. While the driving voltage of the PLEDs was set at 5 V, the open-circuit voltage (Voc) of the OPD was monitored for measuring the absorption of green and red light in the blood to the pulse.

Display Technology

Prof. Yasuhiro Takaki

Tokyo University of Agriculture and Technology, Japan

Title and Abstract

Title:

Abstract:

Prof. Wai-Yeung (Raymond) Wong

Hong Kong Baptist University, China

Title and Abstract

Title:

Phosphorescent White Organic Light-emitting Diodes (WOLEDs) as Future Lighting Sources*

Abstract:

White organic light-emitting diodes (WOLEDs) offer a promising avenue to developing future energy-saving solid-state lighting sources because of their intrinsic characters such as low driving voltages, high brightness and efficiency, large area, etc. While commercialization of WOLEDs has attracted tremendous interest in both academic and industrial communities, the discovery of highly efficient phosphors opens up a good channel to meet this target. With the goal towards practical application, many design strategies, including new materials synthesis, judicious design of device configuration, wise management of charges/excitons in different active layers, development of sophisticated and low cost fabrication procedures, etc. have been put forward to achieve high efficiency, good white color stability and quality. In this lecture, the most recent advances in various aspects of the phosphorescent WOLEDs by our research group are presented.1–6(1) Ying, L.; Ho, C.-L.; Wu, H.; Cao, Y.; Wong, W.-Y. Adv. Mater. 2014, 26, 2459–2473.
(2) Yang, X.; Zhou, G.; Wong, W.-Y. J. Mater. Chem. C 2014, 2, 1760–1778.
(3) Zhou, G.; Wong, W.-Y.; Suo, S. J. Photochem. Photobio. C: Photochem. Rev. 2010, 11, 133–156.
(4) Zhang, B.; Tan, G.; Lam, C.-S.; Yao, B.; Ho, C.-L.; Liu, L.; Xie, Z.; Wong, W.-Y.; Ding, J.; Wang, L. Adv. Mater. 2012, 24, 1873–1877.
(5) Wong, W.-Y. et al., Adv. Mater. 2011, 23, 2976−2980.
(6) Wong, W.-Y. et al., Adv. Mater. 2009, 21, 4181−4184.




* This work was supported by the Areas of Excellence Scheme, University Grants Council of the HKSAR.

Prof. Hiroyuki Yoshida

Osaka University, Japan

Title and Abstract

Title:

Functional diffractive optical elements with liquid crystals

Abstract:

Liquid crystal molecules in standard devices are uniformly oriented over a relatively large area. However, there is recently increased interest in liquid crystals with orientation patterned on the sub-micron to micron range. Light propagating through patterned liquid crystals acquire a phase, commonly known as the Berry phase, that depends on the orientation of the optic axis. A flat slab of liquid crystal can thus perform as a diffractive optical element that transcribes the orientation distribution of the liquid crystal onto the transmitted or reflected phase of light. Various devices based on the concept will be presented and its potential use in future displays will be discussed.

Prof. Yi-Pai Huang

National Chiao Tung University, Taiwan

Title and Abstract

Title:

Micro-optical components for Light Field AR/VR Display Application

Abstract:

Depth, resolution, and field of view(FoV) are always the key factors in light field technology. With optimized micro-optical component, the three factors can be fully compensated. Those micro-optical devices can be passive or electrically driven. In this presentation, we will focus on discussing various Liquid Crystal devices which can change the focal length, scan and shift the image position, which can also result in high-resolution image. Additionally, the optimized free-form optical lens array can further enlarge the FoV of AR/VR glass. Finally, the new application of using VR display for bio-medical application will be discussed.

Solid State Lighting

Prof. Hideto Miyake

Graduate School of Regional Innovation Studies Mie University, Japan

Title and Abstract

Title:

Fabrication of high-quality AlN on sapphire be face-to-face annealingFabrication of high-quality AlN on sapphire be face-to-face annealing

Hideto Miyake 1,2), and Kazumasa Hiramatsu 2)
1) Graduate School of Regional Innovation Studies, Mie University,
2) Department of Electrical and Electronic Engineering, Mie University
E-mail address: miyake@elec.mie-u.ac.jp (H. Miyake)

Abstract:

The annealing of sputtered AlN films with different thicknesses grown on sapphire in nitrogen ambient was investigated. In the annealing, two AlN films on sapphire were overlapped “face-to-face” to suppress the thermal decomposition of the AlN films. The sputtered AlN films with small grains consisted of columnar structure were initially aligned with (0002) orientation but became slightly inclined with increasing film thickness resulting in the formation of a two-layer structure. After annealing, films became a single crystalline layer regardless of the film thickness, and their crystallinity markedly improved after annealing at 1700 oC. The full widths at half maximum of the (0002)- and (10-12)-plane X-ray rocking curves were improved to 30-50 and 200-250 arcsec, respectively.This work was partially supported by JSPS KAKENHI Grant Numbers 15H03556 and 16H06415, and JST CREST No. 16815710, JST SICORP InRel-NPower – EU H2020 No. 720527, and  JST SICORP with MOST in China.

Dr. James S. Speck

University of California Santa Barbara, USA

Title and Abstract

Title:

Development of High Performance (0001) LEDs:  Tunnel Junctions and Green LEDs

Abstract:

In this presentation, we highlight two recent areas of development of high performance c-plane GaN-based LEDs
Tunnel Junctions:  Efficient tunnel junctions (TJ) provide a means of carrier conversion between p-type and n‐type material in semiconductor devices and are potentially advantageous for the III‐Nitride material system, where the poor conductivity of p‐GaN impacts the design and efficiency of light emitting and laser diodes (LEDs and LDs).  We have developed a technologically viable hybrid growth approach that involves growing the active region of devices and top p‐GaN layers by the standard (MOCVD) growth technique, followed by growth of the highly doped n-side of the TJ by ammonia‐assisted molecular beam epitaxy. We have successfully realized high performance VCSELS, edge emitting laser diodes, and LEDs.  For LEDs the high conductivity and low optical loss of n-type GaN enables new designs that effectively increase the light extraction efficiency.  We present c-plane 450 nm LEDs with a peak EQE and WPE of 76% and 73%, respectively.Green LEDs:  We demonstrate very high luminous efficacy MOCVD growth of green light-emitting diodes that employ high temperature InGaN QW growth immediately followed by an  Al0.30Ga0.70N cap layer and then a higher temperature GaN barrier.  The peak external quantum efficiency and luminous efficacies were 44.3% and 239 lm/W, respectively.

Photovoltaic Technology

Prof. Bin Hu

University of Tennessee Knoxville, USA

Title and Abstract

Title:

Photoinduced Bulk Polarization and Spin States in Perovskite Solar Cells and Light-Emitting Devices

Abstract:

Organic-inorganic hybrid perovskites possess three coexisted functionalities: (i) electrical polarization, (ii) spin-orbital coupling, and (iii) direct-band structure. As a result, the hybrid perovskites have become emerging photovoltaic and light-emitting materials. This presentation will report experimental studies on photoinduced bulk polarization and spin states with focus on photovoltaic and light-emitting actions. In photovoltaic actions, the presentation will discuss the experimental measurements of detecting photoinduced bulk polarization and the effects of photoinduced bulk polarization on photovoltaic actions. Furthermore, the presentation will discuss optically generated spin states during the development of photovoltaic actions. Especially, the discussion will present the new methodologies of using spin states to enhance the photovoltaic actions in lead-free Sn perovskite solar cells. In light-emitting actions, the presentation will discuss the polarization-induced passivation of grain boundary defects to enhance electroluminescence in perovskite LEDs.

Prof. Tatsuo Mori

Aichi Institute of Technology, Japan

Title and Abstract

Title:

Effect of Air-Flow and Solvent Annealing on Active Layer for Organic Perovskite Solar Cells

Abstract:

Organic perovskite solar cells are one of attractive solar cells in the viewpoint of low cost and comparatively high power conversion efficiency. They easily influence the fabrication process. In this study, the air-flow process to perovskite active layer and to solvent annealing are introduced. And the air-flow process is effective for manufacturing high-performance devices. Key Word—Organic Perovskite Solar Cells, Air-Flow, Solvent annealing, Crystal Domain.

Prof. Tae-Woo Lee

Seoul National University, South Korea

Title and Abstract

Title:

Polymeric interfacial layers in organic and perovskite photovoltaics

Soyeong Ahn1, Hobeom Kim2, Kyung-Geun Lim1, Mi-Ri Choi1 and Tae-Woo Lee2*#
1Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
2Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
Email: twlees@snu.ac.kr, taewlees@gmail.com

1Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
2Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea
Email: twlees@snu.ac.kr, taewlees@gmail.com

Abstract:

Tailoring the interfacial energetics between an electrode and a photoactive layer in organic photovoltaics (OPVs) and metal-halide hybrid perovskite photovoltaics (PePVs) is important to maximize open circuit voltage (Voc) and thereby power conversion efficiency (PCE). Here, we introduced hole- or electron- extracting polymeric interfacial layers to minimize the interfacial energy offset between the electrode and the photoactive layer leading to improved PV characteristics. Although PEDOT:PSS is the most widely used hole extraction layer (HEL), it cannot make Ohmic contact with overlying organic or perovskite photoactive layer due to its low work function (~5.0 eV) leading to decrease in Voc and thereby PCE (PCDTBT and MAPbI3 ~5.4 eV). To overcome the problem, we used self-organized hole extraction layer (SOHEL) which has an increasing gradient WF from bottom to top owing to the gradient concentration of perfluorinated ionomer (PFI) in the film. Use of SOHEL successfully increased Voc and thereby PCE of both organic and perovskite PVs by minimizing energy offset with the photoactive layers. PEDOT:PSS has another problem in terms of aggregation which can degrade PV performance. Therefore, we used a self-doped conducting polymer, PSS-g-PANI, which is soluble in polar solvents. Since PSS-g-PANI also has low work function, nevertheless, PFI was added into PSS-g-PANI to solve the problem of energy mismatch with the photoactive layer. Lastly, improvement in energy level alignment between electron extraction layers (EELs) and a photoactive layer was achieved using solution-processed ultrathin insulating polymer or conjugated polyelectrolytes (CPEs). The insulating polymer, poly(4-hydroxystyrene) (PHS), was found to form a dipole layer that upshifts the vacuum level of the adjacent negative electrode. CPEs (PSBFB-Na, PAHFP-Br) also decreased energy barrier between Al electrode and a photoactive layer. In addition, the ionic groups in the CPEs further improved energy level alignment at the interface after electric-polling which led to redistribution of them. Therefore, the use of PHS or CPE interlayer significantly improved the built-in potential, Voc and PCE of devices.

[1] K.-G. Lim, S. Ahn, Y.-H. Kim, Y. Qi and T.-W. Lee, Universal energy level tailoring of self-organized hole extraction layers in organic solar cells and organic-inorganic hybrid perovskite solar cells, Energy Environ. Sci., 2016, 9, 932.
[2] K.-G. Lim, H.-B. Kim, J. Jeong, H. Kim, J.-Y. Kim and T.-W. Lee, Boosting the Power Conversion Efficiency of Perovskite Solar Cells Using Self-Organized Polymeric Hole Extraction Layers with High Work Function, Adv. Mater., 2011, 26, 37, 6461-6466.
[3] M.-R. Choi, T.-H. Han, K.-G. Lim, S.-H. Woo, D. H. Huh and T.-W. Lee, Soluble Self-Doped Conducting Polymer Compositions with Tunable Work Function as Hole Injection/Extraction Layers in Organic Optoelectronics, Angew. Chem. Int. Ed., 2011, 50, 6274-6277.
[4] K.-G. Lim, S. Ahn., H. Kim, M.-R. Choi, D. H. Heo and T.-W. Lee, Self-Doped Conducting Polymers as a Hole-Extraction Layer for Organic-Inorganic Hybrid Perovskite Solar Cells, Adv. Mater. Interfaces, 2016, 3, 1500678
[5] K.-G. Lim, S. M. Park, H. Y. Woo, T.-W. Lee, Elucidating the Roles of Conjugated Polyelectrolyte Interlayers for High-Efficiency Organic Photovoltaics, ChemSusChem, 2015, 8, 3062-3068.
[6] K.-G. Lim, M.-R. Choi, H.-B. Kim, J. H. Park and T.-W. Lee, High-efficiency polymer photovoltaic cells using a solution-processable insulating interfacial nanolayer: the role of the insulating nanolayer, J. Mater. Chem. A, 2012, 22, 25148-25153.

# Presenting Author
*Corresponding Author

Prof. Wallace C.H. Choy

The University of Hong Kong, Hong Kong

Title and Abstract

Title:

Novel Green Room-Temperature Solution-Processed Metal Oxides for High Performance Optoelectronic Devices

Abstract:

While high temperature evaporation and sputtering are commonly used for forming metal oxide semiconductors, we will discuss our room-temperature solution approaches for forming various metal oxides. To demonstrate their good electron and hole transport properties, we will use them for all solution-procesed organic/inorganic optoelectronics such as organic solar cells (OSCs), perovskite solar cells, dye sensitized solar cells, organic light emitting diodes, etc which can favor the efficient transport of carriers between the photoactive layer and electrode as well as high optical transparency. Transition metal oxides are promising materials for carrier transport layers because of their good electrical properties, stability, and optical transmission. We propose and demonstrate several low-temperature solution-processed approaches for forming transparent and efficient metal oxide-based carrier transport layers including electron and hole transport layers [1-6]. With the incorporation of metal nanoparticles [7-10], the electrical and optical properties can be enhanced. The interesting features of the novel carrier extraction layers are low temperature, solution process and water free for high performance optoelectronics such as OSCs with power conversion efficiency (PCE) of 10.5% [1-10]. In addition, we have developed some room-temperature processed Ag nano-network which can serve as transparent flexible electrodes [11]. With the knowledge of solution processed organic and inorganic materials, we also propose different approaches for highly stable and efficient perovskite SCs [12] with no hysteresis and most recent PCE of 20.5%.
[1] F. Jiang, W.C.H. Choy, X. Li, D. Zhang, J. Cheng, Adv. Mat., 27, 2930, 2015.
[2] F. Xie, W.C.H. Choy, C. Wang, X. Li, S. Zhang, J. Hou, Adv. Mat., 25, 2051, 2013.
[3] X.C. Li, W.C.H. Choy, et al. Light: Sci. & Applications, 4, e273, 2015.; S. Lu, X. Guan, F. Huang, W.C.H. Choy, et al, Adv. Energy Mat., 5, 1500631, 2015.
[4] X.C. Li, F.X. Xie, S.Q. Zhang, J.H. Hou, W.C.H. Choy, Adv. Function. Mat., 24, 7348, 2014.
[5] F.X. Xie, C.M. Chen, W.C.H. Choy et al, ACS Appl. Mat. & Interfaces, 6, 5367, 2014; D. Zhang, W.C.H. Choy, et al, Org. Electron, 13 2042, 2012.
[7] F.X. Xie, W.C.H. Choy, et al, Energy Environ. Sci., 6, 3372, 2013; D. Zhang, W.C.H. Choy, et al, Adv. Funct. Mat., 23, 4255, 2013.
[9] D. Zhang, F. Xie, P. Lin, W.C.H. Choy, ACS Nano, 7, 1740, 2013.
[10] X.C. Li, W.C.H. Choy, F. Xie, et al, J. Mater. Chem. A, 1, 6614, 2013; J. Liu, X. Li, W.C. H. Choy et al, Adv. Mat. Interface, 2, 1500324, 2015. X. Ren, W.C.H. Choy, et al Small, 12, 5200, 2016.
[11] H. Lu, W. C. H. Choy, et. al. Adv Function. Mat., 25, 4211, 2015; H. Lu, W. C. H. Choy et al, ACS Nano, 8, 10980, 2014; H. Lu, X. Ren, H.P. Ho, W. C. H. Choy, et. al. Scientific Reports, 5, 7876, 2015..
[12] F.X. Xie, W.C.H. Choy, et. al., ACS Nano, 9, 639, 2015; H. Zhang, W.C. H. Choy, et al. Adv. Energy Mat., 5, 1501354, 2015. H. Zhang, W.C.H. Choy, et al. ACS Nano, 10, 1503, 2016; H. Lu, W.C.H. Choy, et. al., Nanoscale, 8, 5946, 2016; J. Liu, W.C.H. Choy, et. al., Nanoscale, 8, 3638, 2016; X. Zhang, W.C.H. Choy, et. al., Nano Lett., 16, 1415, 2016; H. Zhu, W.C.H. Choy, et. al., ACS Nano, 10, 6808, 2016; J. Mao, W.C.H. Choy, et. al., Adv. Funct. Mat., DOI: 10.1002/adfm.201606525.; H. Zhu, W.C.H. Choy, et. al, Adv. Funct. Mat., DOI:10.1002/adfm.201605469; H.Zhang, W.C.H.Choy,et.al, Adv.Mat. DOI:10.1002/adma.201604695.

Thin-Film Technology and Optical Engineering

Dr. George Chang

Browave Corporation, Taiwan

Title and Abstract

Title:

Free Space Matrix in NG-PON2

Abstract:

In NG-PON2, it is defined to use a WM device to multiplex the  L band downstream and demultiplex the C band upstream at OLT,the critical issue is that the loss budget is tight in the system, WM device powered by Free Space Matrix can help to improve for that. Besides, considering A grade connector applied in the system can help on loss budget too.

Prof. Chang Kwon Hwangbo

Optical Technology Education Center, South Korea

Title and Abstract

Title:

Epsilon-Near-Zero Thin Films for Perfect Absorption

Abstract:

Epsilon-near-zero (ENZ, for dielectric function close to zero) metamaterials have been studied in various research areas such as wavefront engineering, supercoupling effect, strong coupling, nonlinear optics, and perfect absorption. At an ENZ wavelength at  , the normal electric field   is very strong and well-confined in an ultra-thin film. Strong enhancement and spatial confinement of electric field induces a large light absorption even in a low loss thin film. In this talk we demonstrate tunable ENZ indium tin oxide (ITO) thin films and broadband perfect absorption using the ITO multilayers at different ENZ wavelengths. Further we propose a new broadband coherent perfect absorption design for optical switching based on ENZ multilayer films.

Title:

Abstract:

Prof. Cheng Chung Lee

National Central University, Taiwan

Title and Abstract

Title:

Application of quantum dots on the optical interference coatings

Abstract:

The preparation of quantum dots, ODs, and it application to solar cell and high reflector will be demonstrated. The extra photons formed by QDs emission are utilized for generating extra charge carriers in devices (0.5%~2% at each wavelength). The reflectors with QDs are greater than 100% which is higher than the limitation of the conventional quarter wave stack.

 

 Important Dates

Paper Submission Opening:3/2

Paper Submission Deadline:8/31

Paper Submission Deadline:9/20

Online Registration Beginning:8/2

Acceptance Notice:10/13

Acceptance Notice:10/17

Early-Bird Registration Deadline:10/20

Early-Bird Registration Deadline:10/30