Article
Optics
Min Zhang, Danni Hao, Shuai Wang, Rui Li, Shou Wang, Yanqing Ma, Ramiro Moro, Lei Ma
Summary: This paper reports a subwavelength chiral metamaterial structure with tunable geometries and compositions for chiral biochemical sample detection. The chiroptical response of the metamaterial can be adjusted by manipulating the number of stacking layers and the twisted angle of the periodic unit. Experimental and numerical analysis reveal that the chiroptical response originates from the optical resonances of the gold disks and the adjacent array layers. The chiral metamaterial can achieve label-free detection of proline in biological samples and enantio-discrimination of chiral molecules, and the transmission circular dichroism (TCD) intensity can be regulated by the analyte concentration.
Article
Chemistry, Multidisciplinary
Mariachiara Manoccio, Marco Esposito, Elisabetta Primiceri, Angelo Leo, Vittorianna Tasco, Massimo Cuscuna, Dmitry Zuev, Yali Sun, Giuseppe Maruccio, Alessandro Romano, Angelo Quattrini, Giuseppe Gigli, Adriana Passaseo
Summary: This study demonstrates the sensing capabilities of a chip-based metamaterial, combining 3D chiral geometry with a functional core-shell nanoarchitecture. The modified optical response of the chiral metamaterial allows for analysis in complex environments and efficient interaction with biomolecules, leading to high sensitivity detection of biomarkers. Measurements in spiked solution and human serum show the potential for early diagnostics and diseases progression monitoring in a range not accessible with common immunological assays, opening new perspectives for next-generation biomedical systems.
Article
Chemistry, Multidisciplinary
S. R. K. Chaitanya Indukuri, Christian Frydendahl, Nityanand Sharma, Noa Mazurski, Yossi Paltiel, Uriel Levy
Summary: Chirality is an important property of biological and pharmaceutical molecules, and the detection of chiral molecules is challenging. Circular dichroism (CD) and fluorescence detection circular dichroism (FDCD) sensing can enhance the measurement sensitivity of chirality, and a negative-index metamaterial (NIM) cavity can further improve the sensitivity and achieve background-free chiral sensing.
Article
Materials Science, Multidisciplinary
Lixin Jiang, Yongfeng Li, Lin Zheng, Hongya Chen, Qi Yuan, Zhibiao Zhu, He Wang, Yongqiang Pang, Jiafu Wang, Shaobo Qu
Summary: Previous methods for reconfigurable chirality require human intervention, but this study proposes a temperature-adaptive chiral meta-device that can manipulate optical chirality through sensing and morphological transformation, opening up new possibilities for various chiral devices.
MATERIALS & DESIGN
(2023)
Article
Materials Science, Multidisciplinary
Lixin Jiang, Yongfeng Li, Lin Zheng, Hongya Chen, Qi Yuan, Zhibiao Zhu, He Wang, Yongqiang Pang, Jiafu Wang, Shaobo Qu
Summary: We propose a self-adaptable material that can autonomously sense environmental changes and undergo morphological transformation, which offers a promising but challenging approach for various chiral devices. By using shape memory alloy, we design a 3D morphable chiral meta-device that can manipulate optical chirality and exhibit reconfigurable circular dichroism. This work paves the way for self-adaptive chiral meta-devices with 3D morphological transformation and has potential applications in optical communication and biosensing.
MATERIALS & DESIGN
(2023)
Article
Chemistry, Multidisciplinary
Junyan Zheng, Xin He, Paul Beckett, Xinjie Sun, Zixin Cai, Wenyi Zhang, Xu Liu, Xiang Hao
Summary: Dichroic circular polarizers (DCPs) and metasurface-based circular polarizers both have their own advantages and disadvantages. However, the plasmonic DCP structure proposed in this paper operates in the visible range with high circular dichroism transmission and maximum transmission efficiency, and is less sensitive to the angle of incidence.
Article
Chemistry, Multidisciplinary
Cuiping Ma, Peng Yu, Wenhao Wang, Yisong Zhu, Feng Lin, Jiaying Wang, Zhimin Jing, Xiang-Tian Kong, Peihang Li, Alexander O. Govorov, Dong Liu, Hongxing Xu, Zhiming Wang
Summary: This paper theoretically investigates the dynamics of thermally induced fluid convection of a chiral plasmonic metasurface and proposes the concept of optofluidic circular dichroism. Results show different fluid velocities of thermally induced convection around a chiral plasmonic metasurface under different circularly polarized excitation. This concept can potentially be used to induce chiral fluid convection in various optofluidics applications.
Article
Chemistry, Analytical
Ayesha Kosar Fahad, Rabia Nazir, Cunjun Ruan
Summary: This paper presents the design of a polarizer that can perform over a wide range of bandwidths in dual frequency bands. The proposed polarizer is ultrathin, works in dual wide-bands, is polarization-diverse, and maintains performance over +/- 45 degrees and +/- 30 degrees oblique incidences.
Article
Engineering, Electrical & Electronic
Syed Hussain Ali Bokhari, Hammad M. Cheema
Summary: The study presents a chiral metasurface that demonstrates robustness at a 60-degree incident angle and high transmission efficiency within a specific frequency range. A methodology for determining resonant frequency is proposed, and it is shown that the metasurface can be scaled for broader microwave applications.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2021)
Article
Physics, Multidisciplinary
Dongsheng Song, Rafal E. Dunin-Borkowski
Summary: This study presents a method for three-dimensional magnetic measurement at atomic scale using EMCD technology, which allows for obtaining signals related to magnetization in three Cartesian directions by using a subangstrom convergent electron beam in STEM. Atomic resolution EMCD signals from all three directions can be separately acquired by moving the detector, and signal enhancement can be achieved by using a defocused electron beam.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Maryam Hajji, Michele Cariello, Cameron Gilroy, Martin Kartau, Christopher D. Syme, Affar Karimullah, Nikolaj Gadegaard, Aurelie Malfait, Patrice Woisel, Graeme Cooke, William J. Peveler, Malcolm Kadodwala
Summary: The use of chiral quantum metamaterials in nano-cavities can significantly enhance the detection sensitivity of chiral molecules, with the ability to easily detect six biomolecules per cavity. This phenomenon is attributed to significant local changes in the optical density of states caused by the introduction of biomolecules, which are invisible in classical light-scattering measurements.
Article
Optics
Hiroya Tomita, Kazuma Hashimoto, Kei Takeya, Saroj R. Tripathi
Summary: In this study, a broadband terahertz wave circular polarizer consisting of metallic helices was developed, capable of transmitting circularly polarized terahertz wave over a wide frequency range.
Article
Chemistry, Multidisciplinary
Miao Peng, Hui Luo, Zhaojian Zhang, Tengfang Kuang, Dingbo Chen, Wei Bai, Zhijie Chen, Junbo Yang, Guangzong Xiao
Summary: This study introduces a chiral metalens as a photonic probe to generate a robust optical pulling force, with the ability to flexibly switch between pulling and pushing forces under different circular polarization states of incident light. The work could lead to a new advanced optical manipulation technique, with potential applications ranging from contactless wafer-scale fabrication to cell assembly and spacecraft attitude control.
Article
Chemistry, Multidisciplinary
Zeyu Feng, Chenlu He, Yifan Xie, Chutian Zhang, Jiahe Li, Dingdong Liu, Zifan Jiang, Xin Chen, Gang Zou
Summary: Chiral metal nanostructures have recently gained attention due to their strong chiroptical properties and enhanced light-matter interactions. In this study, twisted-stacked silver nanowire arrays (TNAs) with independently controllable CD signals at interband transition and plasmonic extinction regions were constructed. These TNAs exhibited high sensitivity towards protein secondary structures, with different responses depending on the protein's beta-sheets or alpha-helices content. The mutually independent optical activities at the interband transition and plasmonic extinction regions complemented each other, providing enhanced sensitivity and reliability in chiral biosensing.
Article
Computer Science, Information Systems
Qinghe Zhuang, Feng Yan, Zhengfeng Xiong, Meng Yang, Min Liu
Summary: This paper presents a novel high-power rotary waveguide phase shifter based on circular polarizers specifically engineered for high-power microwave (HPM) applications. The phase shifter is capable of performing a precise 360 degree linear phase shift through rotation and consists of three parts: a linearly polarized to left-handed circularly polarized (LP-LHCP) mode converter, a left-handed to right-handed circularly polarized (LH-RHCP) mode converter, and a linearly polarized to right-handed circularly polarized (LP-RHCP) mode converter. The paper analyzes the phase-shifting principle, optimizes the three parts of the X-band rotary waveguide phase shifter, and conducts simulation studies on the entire phase shifter, which is made of aluminum. The results show good performance in terms of reflection, insertion loss, and phase shift within the frequency range.
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
Chemistry, Multidisciplinary
Chia-Tse Tai, Po-Yuan Chiu, Chia-You Liu, Hsiang-Shun Kao, C. Thomas Harris, Tzu-Ming Lu, Chi-Ti Hsieh, Shu-Wei Chang, Jiun-Yun Li
Summary: The demonstration of 2D hole gases in GeSn/Ge heterostructures shows a high mobility of up to 20,000 cm(2) V-1 s(-1). The study observed Shubnikov-de Haas oscillations and integer quantum Hall effect, and investigated the Rashba spin-orbit coupling through magneto-transport. Additionally, a transition from weak localization to weak anti-localization was observed, demonstrating the tunability of SOC strength by gating.
ADVANCED MATERIALS
(2021)
Review
Crystallography
Tai-Cheng Yu, Wei-Ta Huang, Wei-Bin Lee, Chi-Wai Chow, Shu-Wei Chang, Hao-Chung Kuo
Summary: Visible light communication (VLC) is an advanced optical wireless communication technology that provides high-speed data transmission and lighting simultaneously. Although LEDs are considered optimal for VLC systems, issues with modulation bandwidth have led researchers to explore micro-LEDs and laser diodes as new light sources. Additionally, advancements in modulation technology have increased the system's transmission capacity.
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
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)
