scholarly journals Narrowband photodetection in the near-infrared with a plasmon-induced hot electron device

2013 ◽  
Vol 4 (1) ◽  
Author(s):  
Ali Sobhani ◽  
Mark W. Knight ◽  
Yumin Wang ◽  
Bob Zheng ◽  
Nicholas S. King ◽  
...  
Keyword(s):  
Near Infrared ◽  
Hot Electron ◽  
Electron Device

OSAS-B: a balloon-borne heterodyne spectrometer for sounding atomic oxygen in the MLT region

2021 ◽  
Author(s):  
Martin Wienold ◽  
Alexey Semenov ◽  
Heiko Richter ◽  
Heinz-Wilhelm Hübers
Keyword(s):  
Atomic Oxygen ◽  
Near Infrared ◽  
Lower Thermosphere ◽  
Local Oscillator ◽  
Hot Electron ◽  
Water Vapor Absorption ◽  
Mesosphere And Lower Thermosphere ◽  
Spectrally Resolved ◽  
Heterodyne Spectrometer ◽  
Mlt Region

<p>The Oxygen Spectrometer for Atmospheric Science on a Balloon (OSAS-B) is dedicated to the remote sounding of atomic oxygen in the mesosphere and lower thermosphere (MLT) region of Earth's atmosphere, where atomic oxygen is the dominant species. Quantitative radiometry of atomic oxygen via its visible and near-infrared transitions has been difficult, due to the complex excitation physics involved. OSAS-B is a heterodyne spectrometer for the thermally excited ground state transition of atomic oxygen at 4.75 THz. It will enable spectrally resolved measurements of the line shape,  which in turn enables the determination of the concentration of atomic oxygen in the MLT. Due to water absorption, this line can only be observed from high-altitude platforms such as a high-flying airplanes, balloons or satellites. Recently the first spectrally resolved observation of the 4.75-THz line has been reported using a heterodyne spectrometer on SOFIA, the Stratospheric Observatory for Infrared Astronomy [1]. Compared to SOFIA a balloon-borne instrument has the advantage of not being hampered by atmospheric water vapor absorption. OSAS-B will comprise a hot-electron bolometer mixer and a quantum-cascade laser as local oscillator in a combined helium/nitrogen dewar. A turning mirror will allow for sounding at different vertical inclinations. The  first flight of OSAS-B is planned for autumn 2022 in the frame of the European HEMERA project [2].</p><p>[1] H. Richter et al., Direct measurements of atomic oxygen in the mesosphere and lower thermosphere using terahertz heterodyne spectroscopy, accepted for publication in Communications Earth & Environment (2021).</p><p>[2] https://www.hemera-h2020.eu/</p>

scholarly journals Plasmonic Hot-Electron Reactive Oxygen Species Generation: Fundamentals for Redox Biology

2020 ◽  
Vol 8 ◽  
Author(s):  
Elisa Carrasco ◽  
Juan Carlos Stockert ◽  
Ángeles Juarranz ◽  
Alfonso Blázquez-Castro
Keyword(s):  
Reactive Oxygen Species ◽  
Near Infrared ◽  
Chemical Reactivity ◽  
Reactive Oxygen Species Generation ◽  
Reactive Oxygen ◽  
Ros Generation ◽  
Oxygen Species ◽  
Hot Electron ◽  
Redox Biology

For decades, the possibility to generate Reactive Oxygen Species (ROS) in biological systems through the use of light was mainly restricted to the photodynamic effect: the photoexcitation of molecules which then engage in charge- or energy-transfer to molecular oxygen (O2) to initiate ROS production. However, the classical photodynamic approach presents drawbacks, like per se chemical reactivity of the photosensitizing agent or fast molecular photobleaching due to in situ ROS generation, to name a few. Recently, a new approach, which promises many advantages, has entered the scene: plasmon-driven hot-electron chemistry. The effect takes advantage of the photoexcitation of plasmonic resonances in metal nanoparticles to induce a new cohort of photochemical and redox reactions. These metal photo-transducers are considered chemically inert and can undergo billions of photoexcitation rounds without bleaching or suffering significant oxidative alterations. Also, their optimal absorption band can be shape- and size-tailored in order to match any of the near infrared (NIR) biological windows, where undesired absorption/scattering are minimal. In this mini review, the basic mechanisms and principal benefits of this light-driven approach to generate ROS will be discussed. Additionally, some significant experiments in vitro and in vivo will be presented, and tentative new avenues for further research will be advanced.

scholarly journals Manifestation of the spontaneous parity-time symmetry breaking phase transition in hot-electron photodetection based on a tri-layered metamaterial

Nanophotonics ◽  
2019 ◽  
Vol 8 (3) ◽  
pp. 495-504 ◽  
Author(s):  
Qiang Bai
Keyword(s):  
Phase Transition ◽  
Theoretical Model ◽  
Symmetry Breaking ◽  
Pt Symmetry ◽  
Coupled Mode Theory ◽  
Hot Electron ◽  
Electron Device ◽  
Coupled Mode ◽  
Time Symmetry ◽  
Existence Conditions

AbstractWe theoretically and numerically demonstrate that the spontaneous parity-time (PT) symmetry breaking phase transition can be realized respectively by using two independent tuning ways in a tri-layered metamaterial that consists of periodic array of metal-semiconductor Schottky junctions. The existence conditions of PT symmetry and its phase transition are obtained by using a theoretical model based on the coupled mode theory. A hot-electron photodetection based on the same tri-layered metamaterial is proposed, which can directly show the spontaneous PT symmetry breaking phase transition in photocurrent and possesses dynamical tunability and switchability. This work extends the concept of PT symmetry into the hot-electron photodetection, enriches the functionality of the metamaterial and the hot-electron device, and has varieties of potential and important applications in optoelectronics, photodetection, photovoltaics, and photocatalytics.

High‐gain lateral hot‐electron device

1989 ◽  
Vol 55 (14) ◽  
pp. 1421-1423 ◽  
Author(s):  
A. Palevski ◽  
C. P. Umbach ◽  
M. Heiblum
Keyword(s):  
High Gain ◽  
Hot Electron ◽  
Electron Device

Hot Electron-Based Near-Infrared Photodetection Using Bilayer MoS2

Nano Letters ◽  
2015 ◽  
Vol 15 (11) ◽  
pp. 7440-7444 ◽  
Author(s):  
Wenyi Wang ◽  
Andrey Klots ◽  
Dhiraj Prasai ◽  
Yuanmu Yang ◽  
Kirill I. Bolotin ◽  
...  
Keyword(s):  
Near Infrared ◽  
Hot Electron ◽  
Infrared Photodetection

scholarly journals Nonmetallic plasmonic heterostructures with multi-synergies on boosting hot electron generation for CO2 photoreduction

2021 ◽  
Author(s):  
Zaizhu Lou ◽  
Changhai Lu ◽  
Xinru Li ◽  
Juan Li ◽  
Liang Mao ◽  
...  
Keyword(s):  
Electron Transfer ◽  
Near Infrared ◽  
Photothermal Effect ◽  
Hot Electron ◽  
Hot Carriers ◽  
Tungsten Oxides ◽  
Pyroelectric Effect ◽  
Electron Generation ◽  
Nir Light ◽  
Physical Effects

Abstract Constructing multi-physical effects on semiconductors is one new horizon to develop next-generation photocatalysts. Here we use pyroelectric black phosphorus (BP) to couple with nonmetallic plasmonic tungsten oxides (WO) forming a BP/WO heterostructures as photocatalysts to convert CO2 for CO under visible-near-infrared (Vis-NIR) light irradiation. Nonmetallic plasmonic heterostructures exhibit 26.1 µmol h− 1 g− 1 CO generation with a selectivity of 98 %, and which is 7- and 17-fold higher than those of plasmonic WO and pyroelectric BP, respectively. The interface P-O-W bonds in heterostructures are constructed to work as channels for electron transfer from BP to plasmonic WO. Moreover, the photothermal energy generated by SPR excitation on WO can make the temperature of heterostructures rapidly increasing from 24 to 86 oC in 10 min, triggering the pyroelectric BP for carriers to promote electron transfer. Multi-physical effects including plasmonic hot carriers and photothermal effect of WO, intrinsic band excitation and pyroelectric effect of BP and W-O-P bonds play synergistic roles on boosting hot electron generation for CO2 reduction. This work provides clear proofs to demonstrate that constructing multi-physical effects on semiconductors is one useful strategy to promote NIR-harvesting for artificial photosynthesis.

Broad-band microwave detection with a novel 2D hot-electron device

1998 ◽  
Vol 23 (5) ◽  
pp. 1079-1082 ◽  
Author(s):  
S. Barbieri ◽  
F. Mango ◽  
F. Beltram ◽  
M. Lazzarino ◽  
L. Sorba
Keyword(s):  
Broad Band ◽  
Hot Electron ◽  
Electron Device ◽  
Microwave Detection

scholarly journals Au@Nb@H x K1-xNbO3 nanopeapods with near-infrared active plasmonic hot-electron injection for water splitting

2018 ◽  
Vol 9 (1) ◽  
Author(s):  
Ying-Chu Chen ◽  
Yu-Kuei Hsu ◽  
Radian Popescu ◽  
Dagmar Gerthsen ◽  
Yan-Gu Lin ◽  
...  
Keyword(s):  
Water Splitting ◽  
Near Infrared ◽  
Electron Injection ◽  
Hot Electron ◽  
Hot Electron Injection

RELATIVISTIC CORRECTIONS TO BALLISTIC QUANTUM TUNNELING THROUGH Ga1−xAlxAs BARRIERS

1991 ◽  
Vol 05 (13) ◽  
pp. 881-888
Author(s):  
H. CRUZ ◽  
A. HERNANDEZ-CABRERA ◽  
A. MUÑOZ
Keyword(s):  
Effective Mass ◽  
Transmission Coefficient ◽  
Analytical Solutions ◽  
Quantum Tunneling ◽  
Type Equation ◽  
Hot Electron ◽  
Electron Device ◽  
Relativistic Corrections ◽  
Dirac Type ◽  
Quantum Electron

Analytical solutions of a Dirac-type equation as effective mass equation. for electrons are obtained and by means of these solutions we have analytically calculated the relativistic transmission coefficient for quantum electron ballistic tunneling through Ga 1−x Al x As -GaAs single barriers. This solution for the transmission coefficient is applied to the tunnel injector of a hot electron device finding that relativistic corrections yield small but significant shifts in the transmittance-voltage characteristics.

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