Results 121 to 130 of about 853,308 (389)
Reusing Waste Coffee Grounds as Electrode Materials: Recent Advances and Future Opportunities
Global Challenges, Volume 7, Issue 1, January 2023., 2023 Coffee industry produces more than 8 million tons of waste coffee grounds (WCG) annually. In recent decades, upcycling of WCG‐derived carbon into value‐added electrode materials has attracted growing interests owing to their low cost and high electrochemical properties.
Matthew Pagett +3 more
wiley +1 more source
Optical vector analysis with attometer resolution, 90-dB dynamic range and THz bandwidth
Nature Communications, 2019 Typical methods for optical vector analysis have tradeoffs among resolution, dynamic range, and bandwidth. The authors use an asymmetric optical probe signal generator and receiver to perform attometer resolution measurement over a THz of bandwidth while
Ting Qing +4 more
doaj +1 more source
Ultralow Phase Noise Optoelectronic Oscillator and Its Application to a Frequency Synthesizer
Leida xuebao, 2019 We propose a novel injection-locked OptoElectronic Oscillator (OEO) with ultralow phase noise based on two cascaded phase modulators, which is further applied to construct a frequency synthesizer.
LIU Shifeng +6 more
doaj +1 more source
Advanced Photonics Research, EarlyView.This study demonstrates a label‐free optical method to monitor cells using a terahertz metasurface‐based biosensing platform. The obtained terahertz signal change for the cell‐contained nanoslots before and after external stimulus is analyzed in terms of transmittance and frequency shift, dynamically representing the cell apoptosis process.
Yeeun Roh +4 more
wiley +1 more source
IEEE Photonics Journal, 2010 A novel approach to achieving photonically assisted microwave frequency twelvetupling with large frequency tunability is proposed and demonstrated. The frequency twelvetupling is realized through a joint operation of polarization modulation, four-wave ...
Wangzhe Li, Jianping Yao
doaj +1 more source
Discovery of dissipative microwave photonic solitons [PDF]
arXiv, 2020 Dissipative solitons rely on the double balance between nonlinearity and dispersion as well as gain and loss have attracted a lot of attention in optics, since it gives rise to ultrashort pulses and broadband frequency combs with good stability and smooth spectral envelopes. Here we observe a novel dissipative solitons in microwave photonics that gives
arxiv
Characterization of Power-to-Phase Conversion in High-Speed P-I-N Photodiodes
, 2011 Fluctuations of the optical power incident on a photodiode can be converted into phase fluctuations of the resulting electronic signal due to nonlinear saturation in the semiconductor.
Datta, S. +6 more
core +1 more source
Advanced Photonics Research, EarlyView.This work introduces a low‐loss diffractive neural network, fabricated using an imprinting technique with parowax material, for recognizing and manipulating the topological charge of orbital angular momentum (OAM) waves. It is also demonstrated that the low‐loss diffractive network can perform mathematical operations based on the topological charges of
Wei Jia +4 more
wiley +1 more source
IEEE Photonics Journal, 2016 Under proper optical injection, period-one (P1) dynamics of an optically injected semiconductor laser can be excited by undamping the relaxation resonance of the semiconductor through Hopf bifurcation.
Pei Zhou +4 more
doaj +1 more source
Reconfigurable On-chip Photoconductive Switches [PDF]
arXiv, 2019 Microwave photonics uses light to carry and process microwave signals over a photonic link. However, light can instead be used as a stimulus to microwave devices that directly control microwave signals. Such optically controlled amplitude and phase-shift switches are investigated for use in reconfigurable microwave systems, but they suffer from large ...
arxiv