Article
Chemistry, Multidisciplinary
Pau Guell-Grau, Francesc Pi, Rosa Villa, Olof Eskilson, Daniel Aili, Josep Nogues, Borja Sepulveda, Mar Alvarez
Summary: The first stretchable plasmonic-enhanced and wrinkled Fabry-Perot (FP) cavities are demonstrated, which are composed of self-embedded arrays of Au nanostructures at controlled depths into elastomer films. These novel structures have unprecedented optomechanical effects and can be used for strain sensing.
ADVANCED MATERIALS
(2022)
Article
Optics
Kejing Huang, Jiaming Zhang, Wentao Wang, Cong Zhao, Ran Huang, Liping Zhen, Honggang Luo, Jie Liu, Yongliang Zhang, Jinglai Duan
Summary: In this study, high-quality elliptical gold nanowires (NWs) were successfully fabricated using an advanced ion-track template technology with precise control over the geometry engineering. Compared to ordinary NWs, the elliptical NWs exhibited highly polarization-dependent plasmonic responses. Plasmonic Fabry-Perot resonances on finite NWs were measured for the first time.
Article
Nanoscience & Nanotechnology
Ren-Min Ma, Si-Yi Wang
Summary: Plasmonic nanolasers, a new class of coherent emitters, amplify surface plasmons in a plasmonic nanocavity and can operate beyond the diffraction limit with faster speed and lower power consumption. Emerging as a promising technology, they offer a wide range of applications and potential for further development.
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
Chemistry, Physical
Fang Chen, Yuchang Li, Wenxing Yang, Boyun Wang, Shuyuan Xiao
Summary: Fano resonance is achieved in a Fabry-Perot (FP) cavity with WS2 sheet, resulting from the interaction between the FP cavity mode and the exciton mode supported by WS2. The system is theoretically modeled using coupled-mode theory (CMT) and numerically studied using finite difference-time domain method (FDTD). Results show that the Fano resonance coupling strength reaches up to 14.1 meV due to WS2's large dipole transition moment, and the line-shapes can be tuned by the height of FP cavity, the position of WS2 sheet, and the refractive index of the dielectric. Moreover, tuning the orientation of the WS2 sheet can change the Fano resonance profile to a symmetrical Lorentz line-shape. The designed structure has potential applications in enhanced light absorption in two-dimensional materials and sensing nano-devices.
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
Mehdi Dehghan, Mohammad Kazem Moravvej-Farshi, Masoud Jabbari, Ghafar Darvish, Mohsen Ghaffari-Miab
Summary: The research successfully designed a bistable THz switch by integrating plasmonic absorption in graphene with a Fabry-Perot cavity resonance, resulting in peaks representing the OFF and ON states for high output and extinction ratio. This optical bistability is achieved by graphene's nonlinear property and enhanced optical intensity due to cavity resonance, adding an intensity-dependent term to the graphene surface conductivity.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Chemistry, Multidisciplinary
Xinye Liao, Junxiang Zeng, Yunxiang Zhang, Xin He, Junbo Yang
Summary: In this study, a dual-band metamaterial absorber based on the combination of plasmonic resonance and Fabry-Perot resonance was numerically investigated. It achieves near-unity absorption for guided lasers and has the advantage of double absorption peaks with insensitivity to polarization and incident angle.
Article
Chemistry, Multidisciplinary
Debarghya Sarkar, Sangyeon Cho, Hao Yan, Nicola Martino, Paul H. H. Dannenberg, Seok Hyun Yun
Summary: Nanolasers with ultrasmall InGaP and InGaAsP disk structures have been demonstrated, offering potential applications in on-chip lightsources and optical barcoding particles. Single-mode lasing was achieved from both disk-on-pillar and isolated particles, with Purcell-enhanced stimulated emission obtained when isolated disks were placed on gold. Wafer-scale fabrication of nanodisks with random size variation was enabled by UV lithography and plasma ashing. Silica-coated nanodisk particles generated stable subnanometer spectra within biological cells across a wide bandwidth.
Article
Materials Science, Multidisciplinary
Meili Li, Junfeng Lu, Peng Wan, Mingming Jiang, Feng Lin, Xianxin Wu, Xinfeng Liu, Caofeng Pan
Summary: In this study, the piezoelectric effect of CsPbBr3 perovskite was utilized to enhance the performance of nanolasers based on the ScAu/M/CPB structure. By changing the applied strain, the piezoelectric polarization effect induced a shift in the plasmonic lasing mode, resulting in a reduction in the lasing threshold. The enhancement mechanism was explained, demonstrating the effective coupling of piezoelectric effect and plasmonics in improving nanolaser performance.
ADVANCED OPTICAL MATERIALS
(2023)
Review
Materials Science, Multidisciplinary
Ru Wang, Chunfeng Wang, Yi Ma, Jianli Sun, Peiguang Yan, Chunxiang Xu, Caofeng Pan
Summary: Plasmonic nanolasers, which go beyond the diffraction limit, have gained significant attention. However, the high optical confinement caused by the plasmon effect also leads to metal absorption loss, increasing the pump threshold. This paper discusses the factors affecting the threshold, reviews experimental efforts, explores applications, and discusses approaches for threshold reduction and future possibilities.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Min-Soo Hwang, Ha-Reem Kim, Kwang-Yong Jeong, Hong-Gyu Park, Yuri Kivshar
Summary: Nanophotonics historically focuses on controlling light at the nanoscale, with recent advancements leading to the development of novel nonplasmonic nano structures and nanolasers empowered by topology and interference effects. These new developments in high-index dielectric nanostructures have expanded the field of nanophotonics and introduced innovative optical devices.
Article
Physics, Multidisciplinary
Mohammad Eskandari, Alireza Shamsi
Summary: This paper investigates the utilization of photonic and plasmonic modes to enhance the absorption of ultrathin film Si Solar Cells. Simulation results show that these mechanisms significantly improve the cell's absorption. Au nanoparticles with different radii are used on the front surface of the cell to explore plasmonic effects and take advantage of the optical properties of localized surface plasmons (LSPs). The use of Au NPs with radii of 25, 50, and 75 nm simultaneously increases the absorption dramatically. Cu NPs are employed on the backside of the cell to enhance absorption in the near-IR region. The achieved performance improvement of ultra-thin film solar cells promises increased application potential in solar energy harvesting.
Article
Chemistry, Multidisciplinary
Jia-Yuan Sun, Duc Huy Nguyen, Jia-Ming Liu, Chia-Yao Lo, Yuan-Ron Ma, Yi-Jia Chen, Jui-Yun Yi, Jian-Zhi Huang, Hien Giap, Hai Yen Thi Nguyen, Chun-Da Liao, Ming-Yi Lin, Chien-Chih Lai
Summary: Record-low-threshold, room-temperature ultraviolet (UV) lasing of plasmon-coupled core-shell nanowires directly grown on silicon is demonstrated for the first time. The naturally formed metal-semiconductor heterostructure of the nanowires leads to a 100-fold improvement in growth density, resulting in intense plasmonic resonance outcoupled to the resonant Fabry-Perot microcavity. This hybrid photonic-plasmonic system achieves a record-low laser threshold with a high spontaneous emission coupling factor, making it a simple and cost-competitive architecture for future UV sources in silicon integration.
Article
Optics
Hamed Moradi, Moheimen Zhoulideh, Mahdi Ghafariasl
Summary: We propose an ultrasensitive tunable terahertz (THz) sensor based on graphene gratings integrated with a Fabry-Perot (FP) cavity. The vertical polarization of the incident light on the graphene gratings causes interference in the propagation of plasmonic waves, enabling ultrasensitive refractive index sensing. This sensor covers a wide range of frequencies and has the potential for various applications, including bio-sensing.
OPTICS COMMUNICATIONS
(2023)
Article
Physics, Condensed Matter
Tsung-Yin Tsai, Pin-Fang Chen, Shu-Wei Chang, Yuh-Renn Wu
Summary: A full sp(3)d(5) tight-binding model is used to calculate the band structure of Mo(x)W(1-x)S(2) alloy monolayers and nanoribbons, with parameters extracted from density functional theory. The electronic properties of Mo(x)W(1-x)S(2) alloys, including band structure, bandgap, and density-of-states effective mass, are computationally determined for potential use in future device design.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2021)
Article
Nanoscience & Nanotechnology
Yu-Jung Lu, Teng Lam Shen, Kang-Ning Peng, Pi-Ju Cheng, Shu-Wei Chang, Ming-Yen Lu, Chih Wei Chu, Tzung-Fang Guo, Harry A. Atwater
Summary: The study demonstrates the improvement of upconversion efficiency and reduction of lasing threshold using single-mode upconversion lasing in a plasmonic nanocavity. This breakthrough in nanolaser technology has significant implications for various applications in photonics and nanotechnology.
Article
Optics
Chih-Hsien Lin, Ding-Wei Huang, Tien-Tsorng Shih, Hao-Chung Kuo, Shu-Wei Chang
Summary: This paper presents a scheme of waveguide photodetectors based on corner reflectors, which allow efficient reflection of optical power back to germanium for additional absorption at the end of the photodetectors, enabling further size reduction and potentially more flexible optimization of the devices.
Review
Cell Biology
Li-An Chu, Shu-Wei Chang, Wei-Chun Tang, Yu-Ting Tseng, Peilin Chen, Bi-Chang Chen
Summary: Superresolution imaging allows visualization of detailed structures of organelles, with multi-dimensional imaging helping us understand cell function. Analyzing structural changes and molecular interactions across a large volume in 3D with different labelled targets is now necessary. Scientists have expanded 2D superresolution microscopic tools into 3D imaging techniques, focusing on reducing phototoxicity in live imaging of cell nucleus.
CURRENT OPINION IN GENETICS & DEVELOPMENT
(2021)
Article
Nanoscience & Nanotechnology
Po-Cheng Tsai, Chun-Wei Huang, Shoou-Jinn Chang, Shu-Wei Chang, Shih-Yen Lin
Summary: Bilayer molybdenum disulfide was epitaxially grown on monolayer graphene by sulfurizing a molybdenum oxide film, with the top layer of MoS2 isolated through atomic-layer etching. The top-gate transistor showed hysteresis in drain current, indicating weak tunneling through 2D layers. This thin heterostructure of 2D materials could be advantageous for applications in dynamic random access memories with reduced thickness.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Engineering, Electrical & Electronic
Chien-Ting Tung, Hsin-Yu Lin, Shu-Wei Chang, Chao-Hsin Wu
Summary: In this study, a charge-control model was developed for tunnel-junction transistor lasers (TJTLs). It was found that the doping concentration in the base-collector junction plays a crucial role in the voltage modulation capability of TJTLs. A trade-off between optical power and modulation capability was observed during the design of doping concentration. Additionally, it was discovered that placing the quantum well closer to the base-collector junction can enhance the output power and modulation bandwidth.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2022)
Article
Nanoscience & Nanotechnology
Meng-Ju Yu, Chih-Li Chang, Hao-Yu Lan, Zong-Yi Chiao, Yu-Chia Chen, Ho Wai Howard Lee, Yia-Chung Chang, Shu-Wei Chang, Takuo Tanaka, Vincent Tung, Ho-Hsiu Chou, Yu-Jung Lu
Summary: Research has shown that a titanium nitride metasurface absorber demonstrates broadband absorption with over 92% average absorption in the wavelength range of 400 to 750 nm, attributed to localized surface plasmon resonance. By integrating this technology with a polymer photocatalyst, a 300% increase in hydrogen evolution rate was observed due to enhanced rates of light absorption, carrier separation, and hot-carrier transfer, providing a new approach for high-efficiency solar energy harvesting systems.
Article
Biology
Wei-Chun Tang, Yen-Ting Liu, Cheng-Han Yeh, Chieh-Han Lu, Chiao-Hui Tu, Yi-Ling Lin, Yu-Chun Lin, Tsui-Ling Hsu, Liang Gao, Shu-Wei Chang, Peilin Chen, Bi-Chang Chen
Summary: This study improves lattice lightsheet microscopy (LLSM) to manipulate cellular behavior with subcellular resolution through optogenetic activation (optoLLSM). By integrating a position-controllable Bessel beam as a stimulation source, spatiotemporal photoactivation can be achieved by changing spatial light modulator (SLM) patterns. The study demonstrates the ability to control membrane ruffling and cell migration behavior using light-triggered recruitment of phosphoinositide 3-kinase and guided cell migration with low energy power.
COMMUNICATIONS BIOLOGY
(2022)
Article
Nanoscience & Nanotechnology
Po-Cheng Tsai, Coung-Ru Yan, Shoou-Jinn Chang, Shu-Wei Chang, Shih-Yen Lin
Summary: We fabricated top-gate transistors on MoS2 with different layer thicknesses in the source and drain regions using atomic layer etching. The transistor exhibited high and low levels of drain current under forward and reverse gate bias, respectively, at zero gate voltage due to the presence of ALE. The hysteresis loop on the transfer curve indicated the existence of two distinct charge states within a certain range of gate bias, and a long retention time of the charge was observed.
Article
Optics
Chao-Chieh Cheng, Pi-Ju Cheng, Tzu-Wei Huang, Wei-Ting Wang, Jui-Tse Tsai, Min-Hsiung Shih, Shu-Wei Chang
Summary: Optical modes spinning with maximum chirality in chip-level cavities are crucial for quantum and biomedical applications. In this study, the researchers realize circularly-polarized-like lasing modes with maximum chirality at the exceptional point of photonic-crystal one-hole cavities. By improving the reliability of fine-tuning, they achieve robust chirality of the radiation field.
Article
Engineering, Electrical & Electronic
Lucas Yang, Shu-Wei Chang, Chao-Hsin Wu
Summary: This study investigates the electrical characteristics and capture-escape lifetimes of Quantum-well-based heterojunction bipolar light-emitting transistors (HBLETs or LETs) using a steady-state testing method. It provides important knowledge for improving the device modulation bandwidth.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Engineering, Electrical & Electronic
Mukul Kumar, Lu-Ching Hsueh, Sheng-Wen Cheng, Shu-Wei Chang, Chao-Hsin Wu
Summary: We developed an analytical model to determine the current gain of HBLETs with MQWs inserted into the base. Our model provides insights into the transistor's operation and aids in designing an efficient epi-layer structure. The current gain decreases as the number of QWs in the base increases, but increases when the QW is placed near the collector. The number and position of QWs affect charge capture and ultimately impact the transistor's current gain. We verified our model using experimental data and layer structure designs.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2023)
Article
Nanoscience & Nanotechnology
Chun-Yen Peng, Hao-Tien Cheng, Yu-Heng Hong, Wen-Cheng Hsu, Fu-He Hsiao, Tien-Chang Lu, Shu-Wei Chang, Shih-Chen Chen, Chao-Hsin Wu, Hao-Chung Kuo
Summary: This study comprehensively analyzes the performance of a commercial photonic-crystal surface-emitting laser (PCSEL) using small-signal measurement and bit-error-rate test. The radio frequency characteristics of the PCSEL are also investigated for the first time. Compared to other types of lasers, the PCSEL shows great potential for a wider optical bandwidth. It is demonstrated that the PCSEL can serve as a promising candidate for high-speed optical communication as a light source.
NANOSCALE RESEARCH LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Hsiang-Ting Lin, Yao-Yu Hsu, Pi-Ju Cheng, Wei-Ting Wang, Shu-Wei Chang, Min-Hsiung Shih
Summary: In this study, in situ optical chirality tunable nanorod trimer metasurfaces were demonstrated, which could control the degree of circular polarization of transmitted wave by adjusting the gap distances between nanorods and the manipulation of localized surface plasmon resonance (LSPR) coupling. These fabricated chiral metasurfaces can be used as important elements for chip-scale flexible optoelectronic integrated circuits in sensing, display, and communication applications.
NANOSCALE ADVANCES
(2022)
Article
Biochemical Research Methods
Yu-Jui Fan, Han-Yun Hsieh, Sheng-Fang Tsai, Cheng-Hsuan Wu, Chia-Ming Lee, Yen-Ting Liu, Chieh-Han Lu, Shu-Wei Chang, Bi-Chang Chen
Summary: The study developed a continuous cell-imaging system with subcellular resolution by integrating a microfluidic platform with lattice lightsheet microscopy (LLSM). By using a microfluidic channel sealed with a water refractive index-matched thin film, aberrations of the lightsheet entering the device were reduced, leading to clearer cell images.
