Results 81 to 90 of about 40,370 (319)

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

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

Efficient metallic spintronic emitters of ultrabroadband terahertz radiation

, 2016
Terahertz electromagnetic radiation is extremely useful for numerous applications such as imaging and spectroscopy. Therefore, it is highly desirable to have an efficient table-top emitter covering the 1-to-30-THz window whilst being driven by a low-cost,
Beaurepaire, E., Braun, L., Freimuth, F., Hannegan, J., Hayden, L. M., Henrizi, J., Jaiswal, S., Jakob, G., Jourdan, M., Kampfrath, T., Kläui, M., Kronenberg, A., Maldonado, P., Martens, U., Mokrousov, Y., Münzenberg, M., Oppeneer, P. M., Radu, I., Seifert, T., Turchinovich, D., Wolf, M.   +20 more
core   +1 more source

High‐Performance Phototransistor Based on a 2D Polybenzimidazole Polymer

Advanced Materials, EarlyView.
A crystalline 2D polybenzimidazole polymer (2DPBI), incorporating a porphyrin‐based π‐system linked via 1,3‐diazole units, is synthesized on the water surface over large areas. The 2DPBI thin‐film exhibits high charge carrier mobility (≈240 cm2 V−1 s−1, measured by terahertz spectroscopy), strong photoresponse, and band‐like transport, enabling ...
Anupam Prasoon, Preetam Dacha, Heng Zhang, Elif Unsal, Mike Hambsch, Alexander Croy, Shuai Fu, Nguyen Ngan Nguyen, Kejun Liu, Haoyuan Qi, Sein Chung, Minyoung Jeong, Lei Gao, Ute Kaiser, Kilwon Cho, Hai I. Wang, Renhao Dong, Gianaurelio Cuniberti, Mischa Bonn, Stefan C. B. Mannsfeld, Xinliang Feng   +20 more
wiley   +1 more source

Stimuli‐Responsive Low‐Frequency Terahertz Absorption ON‐OFF Switchability in Spin‐Crossover Material

Advanced Materials, EarlyView.
A switchable Fe(II)–Hg(II) coordination polymer exhibits reversible ON‐OFF terahertz (THz) absorption through temperature‐ and light‐induced spin‐crossover. The material shows strong, tunable THz responses linked to phonon modes around Fe(II) centers, supported by spectroscopic measurements and calculations.
Guanping Li, Olaf Stefanczyk, Kunal Kumar, Laurent Guérin, Kazuki Nakamura, Maryam Alashoor, Lulu Xiong, Koji Nakabayashi, Kenta Imoto, Yuiga Nakamura, Sumit Ranjan Maity, Guillaume Chastanet, Nicholas F. Chilton, Shin‐ichi Ohkoshi   +13 more
wiley   +1 more source

MILLIMETER AND TERAHERTZ WAVE SCATTERING DIAGRAMS IN RAINS [PDF]

Радиофизика и электроника, 2015
Detailed information about millimeter and terahertz wave scattering diagrams in rains is needed to develop millimeter and terahertz range radio engineering systems.
V. L. Kostina, Yu. I. Malyshenko, A. N. Roenko   +2 more
doaj   +1 more source

Visualization of ferroelectric domains in boracite using emission of terahertz radiation

, 2014
We report on the emission of terahertz radiation by irradiation of femtosecond laser pulses in non-centrosymmetric paraelectric and ferroelectric phases of Co$_3$B$_7$O$_{13}$I boracite.
Abe, N., Arima, T., Kida, N., Kinoshita, Y., Okamoto, H., Saito, M., Sotome, M., Takeda, R.   +7 more
core   +1 more source

Physics and Applications of Terahertz Radiation [PDF]

, 2014
THz Detectors 1 Quantum Well Photodetectors Fabrizio Castellano. 1.1 Fundamentals of photoconductors and photodiodes. 1.2 Semiconductor quantum wells. 1.3 Intersubband transitions. 1.4 Transport in multi-quantum-well systems. 1.5 Quantum well detectors. 1.6 Quantum dot detectors. 2 Bolometric Detectors Francois Simoens. 2.1 Bolometric detection.
Douglas J. Paul, Matteo Perenzoni
openaire   +2 more sources

Plasmonic‐Strain Engineering of Quantum Emitters in Hexagonal Boron Nitride

Advanced Materials Interfaces, EarlyView.
Hexagonal boron nitride (hBN) defects attract interest for single‐photon emission in quantum technologies. This study presents an hBN‐gold nanocone platform to engineer emission centers. The findings reveal emission overlap with gold fluorescence, complicating attribution.
Anuj Kumar Singh, Utkarsh, Pablo Tieben, Kishor Kumar Mandal, Brijesh Kumar, Rishabh Vij, Amrita Majumder, Ikshvaku Shyam, Shagun Kumar, Kenji Watanabe, Takashi Taniguchi, Venu Gopal Achanta, Andreas W. Schell, Anshuman Kumar   +13 more
wiley   +1 more source

Giant Spin Pumping at Polymer/Ferromagnet Interfaces for Hybrid Spintronic Devices

Advanced Materials Interfaces, EarlyView.
The integration of spintronic materials into flexible electronics takes a leap forward with efficient spin pumping across metal‐polymer interfaces. Despite large resistivity mismatch, a silicon‐based polymer (HSQ) demonstrates high spin mixing conductance (≈20 nm−2), possibly driven by spin‐orbital coupling, unveiling new opportunities for polymer ...
Shiva Gaur, Akash Kumar, Himanshu Bangar, Utkarsh Shashank, Hukum Singh, Saroj Prasad Dash, Anubhav Raghav, Johan Åkerman   +7 more
wiley   +1 more source