scholarly journals The dependence of terahertz radiation on the built-in electric field in semiconductor microstructures

2007 ◽  
Vol 15 (8) ◽  
pp. 5120 ◽  
Author(s):  
Jenn-Shyong Hwang ◽  
Hui-Ching Lin ◽  
Chin-Kuo Chang ◽  
Tai-Shen Wang ◽  
Liang-Son Chang ◽  
...  
Keyword(s):  
Electric Field ◽  
Terahertz Radiation

Terahertz Radiation from Nonpolar InN Due to Drift in an Intrinsic In-Plane Electric Field

2010 ◽  
Vol 3 (9) ◽  
pp. 092201 ◽  
Author(s):  
Grace D. Metcalfe ◽  
Hongen Shen ◽  
Michael Wraback ◽  
Gregor Koblmüller ◽  
Chad Gallinat ◽  
...  
Keyword(s):  
Electric Field ◽  
Terahertz Radiation

scholarly journals Терагерцовые дисперсия и усиление при стриминге электронов в графене при 300 K

2020 ◽  
Vol 54 (9) ◽  
pp. 888
Author(s):  
А.А. Андронов ◽  
В.И. Позднякова
Keyword(s):  
Boron Nitride ◽  
Electric Field ◽  
Terahertz Radiation ◽  
High Resistance ◽  
Applied Voltage ◽  
Momentum Space ◽  
Hexagonal Boron Nitride ◽  
Strong Electric Field ◽  
Microwave Generator ◽  
Time Frequency

Abstract We interpret the recent observations of Otsuji’s team (Sendai) on switching from absorption to amplification at a temperature of T = 300 K during the passage of terahertz radiation through hexagonal boron nitride–graphene sandwiches with multiple gates on the surface with an increase in the electric field in graphene. It is shown that these effects are related to dispersion and negative conductivity near the transit-time frequency of electrons in momentum space under streaming (anisotropic distribution) in graphene in a strong electric field. On the basis of these data, a universal tunable terahertz source is proposed, which has the form of a graphene-containing sandwich with a high-resistance silicon wafer (a cavity) with an applied voltage. This terahertz cavity is a complete analog of the microwave generator implemented on an InP chip by Vorobev’s team (St. Petersburg).

Emission of terahertz radiation from GaN/AlGaN heterostructure under electron heating in lateral electric field

2013 ◽  
Author(s):  
V. A. Shalygin ◽  
L. E. Vorobjev ◽  
D. A. Firsov ◽  
A. N. Sofronov ◽  
G. A. Melentyev ◽  
...  
Keyword(s):  
Electric Field ◽  
Terahertz Radiation ◽  
Electron Heating ◽  
Lateral Electric Field

Emission of terahertz radiation from selectively doped AlGaN/GaN heterostructures under the heating of two-dimensional electrons by an electric field

2012 ◽  
Vol 76 (2) ◽  
pp. 207-210 ◽  
Author(s):  
V. A. Shalygin ◽  
L. E. Vorobjev ◽  
D. A. Firsov ◽  
A. N. Sofronov ◽  
G. A. Melentyev ◽  
...  
Keyword(s):  
Electric Field ◽  
Terahertz Radiation ◽  
Two Dimensional

scholarly journals Transition-Cherenkov radiation of terahertz generated by super-luminous ionization front in femtosecond laser filament

2010 ◽  
Vol 28 (3) ◽  
pp. 399-407 ◽  
Author(s):  
Guang-Yue Hu ◽  
Baifei Shen ◽  
An-Le Lei ◽  
Ru-Xin Li ◽  
Zhi-Zhan Xu
Keyword(s):  
Femtosecond Laser ◽  
Electric Field ◽  
Terahertz Radiation ◽  
High Frequency ◽  
Cherenkov Radiation ◽  
Radiation Spectrum ◽  
Ionization Front ◽  
Electron Current ◽  
Coherent Superposition ◽  
Light Speed

AbstractSuper-luminous ionization front achieved by using axicon as focus lens is proposed to improve the transition-Cherenkov radiation of terahertz emitted from a femtosecond laser filament in air. Benefitted from the better coherent superposition of radiation electric field generated by dipole-like electron current behind the ionization front, the terahertz radiation in far zone is enhanced by one order when the velocity of ionization front exceeds the light speed. Moreover, the radiation spectrum extends toward high frequency and covers the entire terahertz gap.

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