Results 121 to 130 of about 246,481 (370)

Laser‐Driven Strong‐Field Terahertz Sources

Advanced Optical Materials, 2019
A review on the recent development of intense laser‐driven terahertz (THz) sources is provided here. The technologies discussed include various types of sources based on optical rectification (OR), spintronic emitters, and laser‐filament‐induced plasma ...
J. Fülöp, S. Tzortzakis, T. Kampfrath
semanticscholar   +1 more source

On‐Chip Active Non‐Reciprocal Topological Photonics

Advanced Materials, Volume 37, Issue 26, July 3, 2025.
An ultra‐compact and efficient on‐chip isolator is experimentally demonstrated by integrating magneto‐optical InSb onto a terahertz silicon topological chip. The simultaneous breaking of spatial and temporal reversal symmetries forms a valley‐conserved non‐reciprocal waveguide mode, enabling a compact cavity size of 6.4 × 2.5λ2 and a low insertion loss
Ridong Jia, Thomas Caiwei Tan, Sobhan Subhra Mishra, Wenhao Wang, Yi Ji Tan, Ranjan Singh   +5 more
wiley   +1 more source

Ultrahigh Conductive MXene Films for Broadband Electromagnetic Interference Shielding

Advanced Materials, EarlyView.
A new series of nitrogen‐substituted MXene films, spanning the full composition range, achieves record‐high conductivity (35 000 S cm⁻¹) and outstanding electromagnetic interference (EMI) shielding across X, Ka, and W bands, even in ultrathin layers.
Ju‐Hyoung Han, Jaeeun Park, Mincheal Kim, Sungwoo Lee, Jin Myeong Heo, Young Ho Jin, Yujin Chae, Juwon Han, Jaewon Wang, Shi‐Hyun Seok, Yeoseon Sim, Gangil Byun, Gun‐Do Lee, EunMi Choi, Soon‐Yong Kwon   +14 more
wiley   +1 more source

A Feasible Approach to Detect Pesticides in Food Samples Using THz-FDS and Chemometrics

Journal of Spectroscopy, 2020
The use of pesticides will have an impact on food, organisms, and environment. Specifically, pesticide residues in food will damage human health. Because of its high permeability, low energy, high spectral resolution, and fingerprint characteristics ...
Qian Chen, Shengyao Jia, Jianyuan Qin, Yong Du, Zongshan Zhao   +4 more
doaj   +1 more source

Interface Topology Driven Loss Minimization in Integrated Photonics: THz Ultrahigh‐Q Cavities and Waveguides

Advanced Materials, EarlyView.
Compact, robust, and ultralow‐loss on‐chip photonic devices are essential for densely integrated photonic chips. Here, the underlying radiation mechanism in topological valley edge states is unveiled and a new methodology of interface topology driven bandgap and wavevector engineering is proposed to thoroughly suppress their radiation losses, thereby ...
Zhonglei Shen, Yi Ji Tan, Wenhao Wang, Thomas Caiwei Tan, Ruqiang Yan, Liuyang Zhang, Ranjan Singh   +6 more
wiley   +1 more source

InGaN/GaN Distributed Feedback Laser Diodes with Surface Gratings and Sidewall Gratings

Micromachines, 2019
A variety of potential applications such as visible light communications require laser sources with a narrow linewidth and a single wavelength emission in the blue light region. The gallium nitride (GaN)-based distributed feedback laser diode (DFB-LD) is
Zejia Deng, Junze Li, Mingle Liao, Wuze Xie, Siyuan Luo   +4 more
doaj   +1 more source

Dual‐Selective Terahertz‐Nanodisc Metasurfaces for Exploring Neurotransmitter Dynamics beyond Spectral Limitations

Advanced Materials, EarlyView.
Observation and detection of neurotransmitter dynamics in aqueous system has been hurdle for analytical fields due to its weak and reversible nature. A terahertz‐nanodisc metasurface which implements comprehensive detection over conformational change and selective sensing is introduced. Utilizing the THz regime photonics and biomimetic environment with
Taeyeon Kim, Yeon Kyung Lee, Yeeun Roh, Jaehun Park, Yong‐Sang Ryu, Hyun Seok Song, Minah Seo   +6 more
wiley   +1 more source

Terahertz spectrum analyzer based on a terahertz frequency comb

Optics Express, 2008
Precision frequency measurements of terahertz (THz) waves are required to establish metrology in the THz spectral region. However, frequency measurement techniques in this region are immature. We propose a THz spectrum analyzer to measure the absolute frequency and spectral shape of continuous-wave THz waves.
Shuko Yokoyama, Tsutomu Araki, Takeshi Yasui, Masaki Nose, Ryotaro Nakamura   +4 more
openaire   +3 more sources

Monolithic Terahertz Topological Mach‐Zehnder Interferometer

Advanced Materials, EarlyView.
A monolithic topological Mach‐Zehnder interferometer (MZI) is presented, integrating the splitter, combiner, and waveguide arms on a single chip. The interferometric fringes exhibiting high on‐off contrast with extinction ratios over 20 dB are achieved by utilizing tailored unit cells that facilitate interface‐dependent out‐of‐plane radiation losses ...
Nikhil Navaratna, Yi Ji Tan, Wenhao Wang, Ranjan Singh   +3 more
wiley   +1 more source

Detection of melatonin and 5-HTP in dietary supplements based on multiple spectra

Frontiers in Nutrition
IntroductionMelatonin and 5-hydroxytryptophan (5-HTP), known for benefits in regulating sleep and combating depression, respectively, are incorporated into dietary supplements.
Huiyu Yang, Huiyu Yang, Huiyu Yang, Xinrui Zhang, Xinrui Zhang, Xinrui Zhang, Yang Gao, Yang Gao, Yang Gao, Zhuang Peng, Zhuang Peng, Zhuang Peng, Bo Su, Bo Su, Bo Su, Kai Li, Cunlin Zhang, Cunlin Zhang, Cunlin Zhang   +18 more
doaj   +1 more source