Article
Materials Science, Multidisciplinary
Qifa Liu, Jingtong Bin, Kerui Feng, Lu Cheng, Lianjie Zhao, Guohua Wu, Jing Chen
Summary: In this study, GaN-based blue photonic crystal surface emitting lasers (PCSELs) were designed by incorporating a TiO2 photonic crystal (PhC) layer on top of the GaN surface. The structure design was optimized to achieve high PhC confinement factor and low gain threshold. The calculated photonic band diagram shows that the designed PCSELs operate at the gamma 1 band edge with low energy consumption.
RESULTS IN PHYSICS
(2022)
Review
Chemistry, Analytical
Youwei Zhang, Ruiqiang Xu, Qiushi Kang, Xiaoli Zhang, Zi-hui Zhang
Summary: This paper reviews the reasons for the low external quantum efficiency (EQE) of micro LEDs and introduces optimization techniques to improve the EQE of micro LEDs.
Article
Engineering, Electrical & Electronic
Vijay S. Palaparthy, Sandeep G. Surya, Ashwini S. Gajarushi, Saurabh Arun Chandorkar, Tapanendu Kundu, Maryam Shojaei Baghini, V. Ramgopal Rao
Summary: A novel dual readout MEMS cantilever with high optical and resistive sensitivities has been developed, integrating a 2D PhC waveguide and piezoresistor element. Excellent piezoresistive and optical sensitivities were achieved, allowing for two distinct signatures for the same target analyte. The unique design of the miniaturized MEMS cantilever makes it vital for high detection accuracy applications.
IEEE SENSORS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Bhuvaneshwari Krishnamoorthi, B. Elizabeth Caroline, Margarat Michael, Sridarshini Thirumaran
Summary: In this study, a single and dual rhombic-shaped ring resonator (RR) bio-sensor using 2D photonic crystal (2D-PhC) and circular Si rods in a square lattice in an air arrangement is designed and simulated. The photonic band gap (PBG) of the structure is calculated using the plane wave expansion method, and the bio-sensor structure is investigated using the finite-difference time-domain method. The optimized simulation parameters are obtained, and the bio-sensor shows the capability of analyzing eleven different components of blood based on the refractive index.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Physics, Applied
Jinpeng Huang, Minglei Tang, Binru Zhou, Zhiqiang Liu, Xiaoyan Yi, Junxi Wang, Jinmin Li, Anlian Pan, Liancheng Wang
Summary: Augmented reality is a next-generation interactive display that enhances user interaction with digital content and the real world. The use of micro-LEDs in AR has some limitations, but this study successfully incorporates distributed Bragg reflectors into micro-LEDs to improve their optical characteristics, making them suitable for various AR applications.
APPLIED PHYSICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Yu-Chung Lin, Ikai Lo, Cheng-Da Tsai, Ying-Chieh Wang, Hui-Chun Huang, Chu-An Li, Mitch M. C. Chou, Ting-Chang Chang
Summary: Red, green, and blue lighting micro-LEDs can be fabricated using InxGa1-xN multiple quantum wells grown on GaN/γ-LiAlO2 microdisk substrates. Optimization of self-assembly growth of InxGa1-xN multiple quantum well microdisks using a ball-stick model has been achieved through bottom-up nanotechnology. It has also been demonstrated that a beautiful InxGa1-xN-QW microdisk for optoelectronic applications can be fabricated by selecting an appropriate buffer layer.
Article
Engineering, Electrical & Electronic
Shotaro Ueda, Daiki Kawasaki, Ryosuke Nishitsuji, Hirotaka Yamada, Kenji Sueyoshi, Hideaki Hisamoto, Tatsuro Endo
Summary: In this study, a highly sensitive PhC sensor was developed by combining a photonic crystal and a highly luminescent material. The fluorescence intensity change in the visible wavelength region was used for detection. The sensor showed high sensitivity and accuracy in detecting disease biomarkers, making it a potential tool for biomedical applications.
MICROELECTRONIC ENGINEERING
(2022)
Article
Nanoscience & Nanotechnology
Sae Katsuro, Weifang Lu, Kazuma Ito, Nanami Nakayama, Naoki Sone, Koji Okuno, Motoaki Iwaya, Tetsuya Takeuchi, Satoshi Kamiyama, Isamu Akasaki
Summary: The study explores the effects of different p-GaN shell growth conditions on the emission characteristics of MQS NW-LEDs, showing that thick p-GaN shells can influence the emission peak and light output. By utilizing a high growth rate of p-GaN shell, the current injection into both the r- and m-planes of NW structures is enhanced, leading to improved light output and EL peak intensity of NW-LEDs. Additionally, the high growth rate of p-GaN shell can suppress dislocations and defects at the apex, inhibiting current injection in nonradiative recombination centers near the c-plane.
Article
Engineering, Electrical & Electronic
Juhi Nishat Ansari, Sanjaykumar C. Gowre, Mahesh V. Sonth, Baswaraj Gadgay, Aashis S. Roy
Summary: This paper structured and simulated a 2D hexagonal photonic nano crystal cavity infiltrated with hemoglobin and urine samples for refractive index biosensing application. The results showed significant shifting of resonant wavelength and high sensitivity for the biosensor application. The photonic band gap was determined using the PWE method and simulation results were analyzed using OptiFDTD.
INTEGRATED FERROELECTRICS
(2021)
Article
Nanoscience & Nanotechnology
Shumeng Yan, Meixin Feng, Shizhao Fan, Rui Zhou, Yongjun Tang, Tianhao Jiang, Jianxun Liu, Yu Zhou, Qian Sun, Hui Yang
Summary: This study reports a method to thermally activate buried p-GaN in tunnel junction LED (TJ-LED) by creating a hydrogen outgassing passage through vertically aligned nanopipe arrays across the top n-GaN layer. The large-size TJ-LED chips fabricated using this method exhibit nearly equivalent p-GaN activation and superior light extraction efficiency compared to conventional LEDs, with a 44% boost in light extraction efficiency at an injection current density of 100 A cm(-2).
Article
Crystallography
Umair Ahmed, Yousuf Khan, Muhammad Khurram Ehsan, Muhammad Rizwan Amirzada, Naqeeb Ullah, Abdul Rafay Khatri, Atiq Ur Rehman, Muhammad A. Butt
Summary: This study investigated the spectral properties of DBR-PhC structures in the NIR range by varying different structural properties. It aimed to achieve optical filtering properties, simplify the structure of Fabry-Perot filters, and apply the proposed DBR-PhC device to various optical filtering and sensing applications.
Article
Health Care Sciences & Services
Shabir Moosa
Summary: The primary health care system in Africa faces challenges in terms of insufficient human resources, inequitable distribution, and lack of training. However, there are opportunities in terms of global milestones and political will for investment in primary health care. The African Forum for PHC calls for the development of a regional plan to build robust primary health care systems, train and recruit sufficient workforce, and support primary health care with appropriate financing.
RISK MANAGEMENT AND HEALTHCARE POLICY
(2023)
Article
Chemistry, Physical
Hehe Zhang, Jan Mischke, Wolfgang Mertin, Gerd Bacher
Summary: This paper provides an overview of the current status of graphene-based transparent conductive electrodes in GaN-based LEDs. It focuses on manufacturing progress and the resulting properties of the fabricated devices, discussing the impact of graphene-based transparent conductive electrodes on current spreading and contact resistance, as well as future challenges and perspectives on the use of graphene in GaN-based LEDs.
Article
Physics, Applied
Jinpeng Huang, Yi Xu, Binru Zhou, Huming Zhan, Peng Cao, Junxi Wang, Jinmin Li, Xiaoyan Yi, Anlian Pan, Liancheng Wang
Summary: 3D micro-LED displays combine the characteristics of 3D display and the advantages of micro-LEDs, providing users with a 3D experience. LP micro-LEDs with varied chip diameters are investigated and show potential for use in 3D micro-LED displays.
APPLIED PHYSICS LETTERS
(2023)
Article
Crystallography
Xiaomeng Fan, Shengrui Xu, Hongchang Tao, Ruoshi Peng, Jinjuan Du, Ying Zhao, Jinfeng Zhang, Jincheng Zhang, Yue Hao
Summary: The method of improving the performance of UV-LEDs with stair-like Si-doping GaN layer has been studied, showing better quality and lower dislocation density. The experimental results indicate significant improvements in light output power and wall plug efficiency. The enhancement in photoelectric characteristics is attributed to the reduction of dislocation density and alleviation of current crowding by introducing stair-like Si-doping GaN.
Article
Optics
Yizhi Zhu, Heng Guo, Qiannan Cui, Jinping Chen, Zhuxin Li, Junfeng Lu, Tien-Chang Lu, Zhengchun Peng, Chunxiang Xu, Caofeng Pan
Summary: Manipulating photocarrier dynamics for luminescent materials is of fundamental importance for controlling the luminescent properties of optoelectronic devices. This study demonstrates the enhancement and prolongation of photoluminescence through interfacial engineering, which enables resonant coupling between localized surface plasmon and exciton. The photocarrier dynamics at the interface are mediated by plasmon-induced hot electron transfer (PHET) and plasmon-induced resonant energy transfer (PIRET) processes, which can be actively switched on and off by varying the excitation laser wavelength. These findings are highly significant for actively manipulating photocarrier dynamics in perovskite luminescent devices.
LASER & PHOTONICS REVIEWS
(2023)
Article
Nanoscience & Nanotechnology
Chun-Feng Lai, Fu-Jia Shiau
Summary: This study presents and investigates pH-triggered drug-eluting contact lenses (DCLs) combined with large-pore mesoporous silica nanoparticles (LPMSNs). LPMSN-laden DCLs can prolong the residence time of glaucoma drugs in an artificial lacrimal fluid (ALF) environment at pH 7.4 compared to reference DCLs. The LPMSN-laden DCLs do not require drug preloading and are compatible with current contact lens manufacturing processes. LPMSN-laden DCLs soaked at pH 6.5 exhibit better drug loading capabilities than reference DCLs due to specific adsorption.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Chemistry, Multidisciplinary
Zhen-Ting Huang, Ting-Wei Chien, Chang-Wei Cheng, Cheng-Ching Li, Kuo-Ping Chen, Shangjr Gwo, Tien-Chang Lu
Summary: Stable electrical modulation of plasmonic nano-lasers is achieved on a hybrid graphene-insulator-metal (GIM) platform at room temperature. A zinc oxide (ZnO) nanowire is placed on the GIM platform to create a plasmonic cavity, and the graphene layer is used for electrical modulation. The lasing thresholds of the ZnO nanowire plasmonic nanolasers on the GIM platform can be modulated by the gate voltage, demonstrating high potential for plasmonic circuit applications.
Article
Engineering, Electrical & Electronic
Chia-Yen Huang, Wen-Hsuan Hsieh, Teng-Li Shao, Chang-Hsien Wu, Tien-Chang Lu
Summary: We reported an unexpected power degradation mechanism in high-power UVC LEDs grown on high-quality AlN templates. Nitrogen desorption, activated by UVC photon emitted from the active region, introduced observable nitrogen loss and created a continuous leakage path from the active region to the p-electrode via various trap-assisted transport mechanisms, resulting in the power degradation of the LEDs.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Chemistry, Multidisciplinary
Jun-Wei Liao, Zhen-Ting Huang, Chia-Hung Wu, Nikita Gagrani, Hark Hoe Tan, Chennupati Jagadish, Kuo-Ping Chen, Tien-Chang Lu
Summary: In this study, localized surface plasmon lasing at room temperature in the communication band was achieved using metallic nanoholes as plasmonic nanocavity and InP nanowires as gain medium. Optimization of laser performance was demonstrated through coupling between two metallic nanoholes, allowing for manipulation of lasing properties. These plasmonic nanolasers offer lower power consumption, smaller mode volumes, and higher spontaneous emission coupling factors, making them promising for high-density sensing and photonic integrated circuits.
Article
Chemistry, Multidisciplinary
Lih-Ren Chen, Chia-Jui Chang, Yi-Jing Wu, Cheng-Lin Liu, Wei Lin, Tien-Chang Lu
Summary: This study presents research on InP-based photonic-crystal surface-emitting lasers (PCSELs) for high-power emission in the L band. The incorporation of embedded air voids within a 2D photonic crystal structure enables vertical laser emission. Investigation into the regrowth processes successfully retained the air holes and achieved an atomically flat p-type surface, resulting in higher output efficiency.
CRYSTAL GROWTH & DESIGN
(2023)
Article
Chemistry, Multidisciplinary
Chia-Hung Wu, Chih-Jen Ku, Min-Wen Yu, Jhen-Hong Yang, Pei-Yuan Wu, Chen-Bin Huang, Tien-Chang Lu, Jer-Shing Huang, Satoshi Ishii, Kuo-Ping Chen
Summary: This study explores plasmonic photodetection using graphene as a 2D material, achieving non-scattering near-field detection of surface plasmon polaritons. The maximum photoresponsivity is 29.2 mA W-1, and the polarization state of the input light produces a 400% contrast. This has potential applications in on-chip optoelectronic circuits.
Editorial Material
Optics
Jin-Wei Shi, Tien-Chang Lu, Fumio Koyama
Article
Materials Science, Multidisciplinary
Zuhaib Khan, Min-Long Wu, Cheng-Wei Lin, Cheng-Chun Chen, Chia-Jui Chang, Tien-Chang Lu, Nikolay Ledentsov Jr, Nikolay Ledentsov, Jin-Wei Shi
Summary: This article demonstrates a novel layout and arrangement of electrodes for a vertical-cavity surface-emitting laser (VCSEL) array, which improves both its high-speed data transmission performance and the brightness of the output beam. The new design reduces the pitch size between neighboring light emission apertures, allowing downsizing of the whole active area and achieving high brightness output. The demonstrated compact 7 x 7 VCSEL array features separate electrodes for dc current injection and ac signal modulation, leading to improved electrical-optical frequency response, wider bandwidth, and higher brightness output compared to a reference device.
ADVANCED PHOTONICS RESEARCH
(2023)
Article
Nanoscience & Nanotechnology
Chia-Jui Chang, Yu-Wen Chen, Lih-Ren Chen, Kuo-Bin Hong, Jhih-Sheng Wu, Yao-Wei Huang, Tien-Chang Lu
Summary: This article introduces a new method for directly generating vector vortex beams from photonic crystal surface emitting lasers while preserving C-6 rotation symmetry. The ability to dynamically switch between different orders is demonstrated.
Article
Chemistry, Multidisciplinary
Zhen-Ting Huang, Ting-Wei Chien, Chang-Wei Cheng, Cheng-Ching Li, Kuo-Ping Chen, Shangjr Gwo, Tien-Chang Lu
Summary: Stable electrical modulation of plasmonic nanolasers is achieved on a graphene-insulator-metal platform, where the gate voltage can adjust the lasing thresholds of the ZnO nanowire plasmonic nanolasers, providing high-speed modulation characteristics.
Article
Nanoscience & Nanotechnology
Chia-Jui Chang, Lih-Ren Chen, Kuo-Bin Hong, Tien-Chang Lu
Summary: Photonic crystal surface-emitting lasers (PCSELs) have promising properties over traditional semiconductor lasers. However, the minimum achievable lasing threshold of PCSELs is still larger than that of vertical-cavity surface-emitting lasers (VCSELs), limiting its applications. In this study, a new design is proposed to reduce the threshold current of PCSELs by using selective quantum-well intermixing, while maintaining the advantage of small divergence angle.
Article
Chemistry, Physical
Min-Wen Yu, Yu-Tang Lin, Chia-Hung Wu, Tung-Jung Wang, Jhuang-Hao Cyue, Jun Kikkawa, Satoshi Ishii, Tien-Chang Lu, Kuo-Ping Chen
Summary: This work successfully controlled the number of sulfur vacancies in monolayer WS2 flakes synthesized by chemical vapor deposition (CVD), resulting in a difference in photoluminescence (PL) intensity. The sulfur vacancies introduce defect trap states that cause carrier recombination and reduce carrier drift to graphene, thus decreasing the photocurrent. Furthermore, the gate-tunable Fermi level of graphene allows tunable responsivity of the WS2-graphene photodetector.
APPLIED SURFACE SCIENCE
(2024)
Article
Optics
Zhen-Ting Huang, Chiao-Yun Chang, Kuo-Ping Chen, Tien-Chang Lu
Summary: The article describes the research results of realizing off-G lasing using FW-BIC in a one-dimensional suspended high-contrast grating, which can achieve low-threshold operation and precise angle control.
ADVANCED PHOTONICS
(2022)
Article
Materials Science, Multidisciplinary
Wen-Hui Xu, Yu-Hsun Chou, Zih-Ying Yang, Yi-Yun Liu, Min-Wen Yu, Chen-Hang Huang, Chun-Tse Chang, Chen-Yu Huang, Tien-Chang Lu, Tzy-Rong Lin, Kuo-Ping Chen
Summary: A ZnO-based Tamm plasmon-polariton ultraviolet laser was successfully realized with strong electric field confinement in the active layer. The coupling between TPPs and photons with a Rabi splitting of approximately 30 meV was observed at room temperature. In addition, TPP lasing at 373 nm was clearly observed through optical pumping, and its corresponding characteristics were verified. These results provide a basis for better understanding of the TPP lasing mechanisms.
ADVANCED PHOTONICS RESEARCH
(2022)
