Results 81 to 90 of about 219,971 (340)

Tight focusing field of cylindrical vector beams based on cascaded low-refractive index metamaterials

Nanophotonics, 2023
Using low-refractive-index metamaterials, we design a transmission-type radial-angular cylindrical vector beam generator. A high numerical aperture lens is constructed using an asymmetric meta-grating structure. The metamaterial vector beam generator and
Ke Lan, Li Chenxia, Zhang Simeng, Fang Bo, Tang Ying, Hong Zhi, Jing Xufeng   +6 more
doaj   +1 more source

Orthogonal Sampling-Based Broad-Band Signal Generation With Low-Bandwidth Electronics

IEEE Open Journal of the Communications Society, 2023
High-bandwidth signals are needed in many applications like radar, sensing, measurement and communications. Especially in optical networks, the sampling rate and analog bandwidth of digital-to-analog converters (DACs) is a bottleneck for further ...
Mohamed I. Hosni, Janosch Meier, Younus Mandalawi, Karanveer Singh, Paulomi Mandal, Ahmed H. Elghandour, Thomas Schneider   +6 more
doaj   +1 more source

Terahertz imaging and spectroscopy of large-area single-layer graphene

, 2011
We demonstrate terahertz (THz) imaging and spectroscopy of a 15x15-mm^2 single-layer graphene film on Si using broadband THz pulses. The THz images clearly map out the THz carrier dynamics of the graphene-on-Si sample, allowing us to measure sheet ...
A. D. Jameson, A. M. van der Zande, Bae, Berger, Brumfiel, Castro Neto, Choi, Dragoman, E. D. Minot, Ferrari, Geim, Geim, J. L. Tomaino, J. W. Kevek, Kim, Lee, Li, Li, Lin, M. J. Paul, Mak, Nahata, P. L. McEuen, Pisana, Ponomarenko, R. A. Barton, Rangel, Ryzhii, Tan, Wang, Yun-Shik Lee, Zhang   +31 more
core   +1 more source

Opportunities of Semiconducting Oxide Nanostructures as Advanced Luminescent Materials in Photonics

Advanced Materials, EarlyView.
The review discusses the challenges of wide and ultrawide bandgap semiconducting oxides as a suitable material platform for photonics. They offer great versatility in terms of tuning microstructure, native defects, doping, anisotropy, and micro‐ and nano‐structuring. The review focuses on their light emission, light‐confinement in optical cavities, and
Ana Cremades, Pedro Hidalgo, David Maestre, Ruth Martínez‐Casado, Emilio Nogales, Beatriz Rodríguez, G. Cristian Vásquez, Bianchi Méndez   +7 more
wiley   +1 more source

Filterless and Compact ANy-WDM Transmission System Based on Cascaded Ring Modulators

IEEE Access, 2022
To cope with the exponential increase in internet services and corresponding data traffic, especially data centers and access networks require new high data rate transmission methods with low cost, very small package and low energy consumption.
Mohamed I. Hosni, Karanveer Singh, Younus Mandalawi, Janosch Meier, Ayman M. Mokhtar, Thomas Schneider   +5 more
doaj   +1 more source

Low-Loss THz Waveguide Bragg Grating using a Two-Wire Waveguide and a Paper Grating

, 2013
We propose a novel kind of the low-loss THz Waveguide Bragg Grating (TWBG) fabricated using plasmonic two-wire waveguide and a micromachined paper grating for potential applications in THz communications.
Bock, Wojtek J., Chinifooroshan, Yasser, Markov, Andrey, Skorobogatiy, Maksim, Tripathi, Saurabh M., Yan, Guofeng   +5 more
core   +1 more source

Design and characterization of optical-THz phase-matched traveling-wave photomixers [PDF]

, 1999
Design and characterization of optical-THz phase-matched traveling-wave photomixers for difference-frequency generation of THz waves are presented.
Blake, Geoffrey A., Gossard, Arthur C., Jackson, Andrew W., Kadow, Christopher, Matsuura, Shuji, Pearson, J. C., Wyss, Rolf A.   +6 more
core   +1 more source

3D Anodic Alumina Nanoarchitectures: A Decade of Progress from Foundational Science to Functional Metamaterials

Advanced Materials, EarlyView.
Ordered three‐dimensional anodic aluminum oxide (3D‐AAO) nanoarchitectures with longitudinal and transverse pores enable architecture‐driven metamaterials. The review maps fabrication advances, including hybrid pulse anodization, and shows how 3D‐AAO templates tailor properties across magnetism, energy, catalysis, and sensing.
Marisol Martín‐González
wiley   +1 more source

Co-Crystal Formation of Antibiotic Nitrofurantoin Drug and Melamine Co-Former Based on a Vibrational Spectroscopic Study

Pharmaceutics, 2019
The co-crystallization of active pharmaceutical ingredients (APIs) has received increasing attention due to the modulation of the relative physicochemical properties of APIs such as low solubility, weak permeability and relatively inferior oral ...
Ziming Zhang, Qiang Cai, Jiadan Xue, Jianyuan Qin, Jianjun Liu, Yong Du   +5 more
doaj   +1 more source

Wireless THz link with optoelectronic transmitter and receiver [PDF]

Optica, 2019
Photonics might play a key role in future wireless communication systems that operate at terahertz (THz) carrier frequencies. A prime example is the generation of THz data streams by mixing optical signals in high-speed photodetectors.
T. Harter, S. Ummethala, M. Blaicher, S. Muehlbrandt, S. Wolf, Marco M. Weber, M. Adib, J. Kemal, Marco Merboldt, F. Boes, S. Nellen, A. Tessmann, M. Walther, B. Globisch, T. Zwick, W. Freude, S. Randel, C. Koos   +17 more
semanticscholar   +1 more source