Results 91 to 100 of about 1,429,782 (326)

Terahertz Rectifyier for Integrated Image Detector

Procedia Engineering, 2015
AbstractWe present a new CMOS compatible direct conversion terahertz detector operating at room temperature. The rectenna consists in a truncated conical helix extruded from a planar spiral and connected to a nanometric metallic whisker at one of its edges. The whisker reaches the semiconductor substrate that constitutes the antenna ground plane.
VARLAMAVA, VOLHA, De Amicis, Giovanni, Del Monte, Andrea, PERTICAROLI, STEFANO, RAO, ROSARIO, PALMA, Fabrizio   +5 more
openaire   +1 more source

Carrierless I-Q Mixing for Terahertz Communications

, 2022
We experimentally demonstrate the transmission of a carrierless quadrature amplitude-modulated signals at a data rate up to 64 Gbit/s using a 253 GHz photonics-based terahertz communications system with optical intensity modulation, 10-km single mode ...
Shehata, M., Wang, K., Withayachumnankul, W.   +2 more
core   +1 more source

Unlocking Terahertz Steganography: Authentication of Hidden Images in Flexible Media

Advanced Materials Technologies, EarlyView.
Hidden information in multilayered devices, such as steganographic portraits, is detected and authenticated using reflection‐mode terahertz time‐domain imaging. Image reconstruction relies on a dedicated figure‐of‐merit obtained by integrating the signal intensity over the time‐window associated with the reflection from the metallic mirror backing the ...
Tiziana Ritacco, Francesca Vittorioso, Dimitrios C. Zografopoulos, Romeo Beccherelli, Walter Fuscaldo   +4 more
wiley   +1 more source

Improvement of an InfraRed Pyroelectric Detector Performances in THz Range Using the Terajet Effect

Applied Sciences, 2021
An infrared (IR) pyroelectric detector was investigated for terahertz (THz) detection using the principle of the terajet effect, which focuses the beam beyond the diffraction limit.
Oleg V. Minin, Jaime Calvo-Gallego, Yahya M. Meziani, Igor V. Minin   +3 more
doaj   +1 more source

Localized Ion Irradiation Enables Topography‐Free High‐Tc Superconducting Metamaterials

Advanced Optical Materials, EarlyView.
A topography‐free oxygen ion‐irradiation strategy is demonstrated for patterning superconducting YBCO terahertz metamaterials without physical material removal. The approach preserves film integrity while enabling large spectral tunability, ultrafast optical modulation, and dual‐band resonance control, providing a scalable platform for low‐loss ...
Teng Chen Ietro Pang, Yogesh Kumar Srivastava, Sobhan Subhra Mishra, Sambhu Jana, Jérôme Lesueur, Ranjan Singh   +5 more
wiley   +1 more source

Effective Generation of Milliwatt-Level Sub-Terahertz Wave for Nonlinear Response Measurement of Two-Dimensional Material by Optical Heterodyne Technique

Advances in Condensed Matter Physics, 2017
By using optical heterodyne technique, we demonstrated the stable emission of sub-terahertz wave with the frequency ranging from 88 GHz to 101 GHz, which can operate as microwave source for nonlinear response measurement system.
Shuqing Chen, Zhiqiang Xie, Junmin Liu, Yanliang He, Yao Cai, Xiaoke Zhang, Jiangnan Xiao, Ying Li, Dianyuan Fan   +8 more
doaj   +1 more source

Near‐Field Nanoimaging of Programmable Phase Transitions in Ga+‐Irradiated VO2

Advanced Optical Materials, EarlyView.
Focused Ga+ ion irradiation locally reprograms the insulator‐to‐metal transition in VO2 thin films. Infrared and terahertz near‐field nanoimaging reveals that low irradiation doses localize the resistive‐switching filament within the defect region, while high doses suppress switching there and redirect the filament into pristine VO2.
Sarabpreet Singh, Nareg Ghazikhanian, Muhammad Asjad, Erbin Qiu, Ivan K. Schuller, Yohannes Abate   +5 more
wiley   +1 more source

Designing and manufacturing aspherical polystyrene lenses for the terahertz region

Semiconductor Physics, Quantum Electronics & Optoelectronics, 2018
We report on the development of lenses for terahertz vision systems from their design up to manufacturing. Fused deposition modeling was used for assisting the 3D printing manufacturing process.
A. Shevchik-Shekera, V. Zabudsky, A. Golenkov, S. Dvoretsky   +3 more
doaj   +1 more source

Epitaxial MgSnN2 on 4H‐SiC (0001): An Earth‐Abundant Nitride for Green Optoelectronics and Photovoltaics

Advanced Optical Materials, EarlyView.
The importance of photovoltaics (PV) and optoelectronics based on new Earth‐abundant materials is increasing with the ever‐growing energy demand and the need to address it with sustainable material technology. The paper demonstrates good quality magnetron sputter epitaxy of the inexpensive and eco‐friendly semiconductor MgSnN2 for green gap ...
D. Gogova, D. Tran, V. Stanishev, D. Shafizadeh, C.‐L. Hsiao, M. Kim, B. Pécz, A. Kovács, K. Frey, A. Sulyok, N. K. Singh, A. Le Febvrier, P. Eklund, V. Darakchieva   +13 more
wiley   +1 more source

Wavelength‐Multiplexed 2D Beam Steering via a Passive Diffractive Network

Advanced Optical Materials, EarlyView.
Illustration of a wavelength‐multiplexed diffractive beam steering system, which is composed of K cascaded diffractive layers, each containing phase‐modulating elements that are jointly optimized using deep learning–based optimization. When illuminated with a set of wavelengths {λ1,λ2,…,λNw}$\{ {{{\lambda }_1},{{\lambda }_2},\ldots ,{{\lambda }_{{{N}_w}
Che‐Yung Shen, Yuhang Li, Çağatay Işıl, Tianyi Gan, Mona Jarrahi, Aydogan Ozcan   +5 more
wiley   +1 more source