Observation of Four-fold Azimuthal Angle Dependence in the Terahertz Radiation Power of (100) p-InAs

2006 ◽  
Author(s):  
E. Estacio ◽  
C. Ponseca ◽  
A. Quema ◽  
S. Ono ◽  
R. Pobre ◽  
...  
Keyword(s):  
Terahertz Radiation ◽  
Radiation Power ◽  
Azimuthal Angle ◽  
Angle Dependence

Magnetic-field-induced fourfold azimuthal angle dependence in the terahertz radiation power of (100) InAs

2007 ◽  
Vol 90 (15) ◽  
pp. 151915 ◽  
Author(s):  
Elmer Estacio ◽  
Hisashi Sumikura ◽  
Hidetoshi Murakami ◽  
Masahiko Tani ◽  
Nobuhiko Sarukura ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Terahertz Radiation ◽  
Radiation Power ◽  
Azimuthal Angle ◽  
Angle Dependence

Terahertz emission from GaInAs p-i-n diodes photoexcited by femtosecond laser pulses

2016 ◽  
Vol 55 (4) ◽  
Author(s):  
Ignas Nevinskas ◽  
Sandra Stanionytė ◽  
Vaidas Pačebutas ◽  
Arūnas Krotkus
Keyword(s):  
Femtosecond Laser ◽  
Crystallographic Orientation ◽  
Azimuthal Angle ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Voltage Source ◽  
Terahertz Emission ◽  
External Voltage ◽  
Angle Dependence ◽  
Lattice Matched

Lattice-matched GaInAs p-i-n diodes of different i-region thicknesses have been MBE grown on n-type InP (100) and (111) crystallographic orientation substrates. It has been found that terahertz emission from such structures when illuminated with femtosecond laser pulses can be more efficient than that from the known to date best surface terahertz emitter (111) p-InAs. The explanation of the terahertz generation mechanism from p-i-n diodes is based on ultrafast photocurrent effects. Anisotropic transient photocurrents causing the 3ϕ azimuthal angle dependence are observed in the sample on (111) substrate. These p-i-n structures allow covering a technologically important 1.55 μm range and may provide controllability and compactness of a THzTDS system when biased with an external voltage source.

scholarly journals APPROXIMATE VORTEX SOLUTION OF FADDEEV MODEL

2008 ◽  
Vol 23 (09) ◽  
pp. 1361-1369 ◽  
Author(s):  
CHANG-GUANG SHI ◽  
MINORU HIRAYAMA
Keyword(s):  
Differential Equation ◽  
Ordinary Differential Equation ◽  
Minimum Energy ◽  
Azimuthal Angle ◽  
Static Field ◽  
Angle Dependence ◽  
Approximate Analytic Expression ◽  
Vortex Solution ◽  
Analytic Expression ◽  
Faddeev Model

Through an ansatz specifying the azimuthal-angle dependence of the solution, the static field equation for vortex of the Faddeev model is converted to an algebraic ordinary differential equation. An approximate analytic expression of the vortex solution is explored so that the energy per unit vortex length becomes as small as possible. It is observed that the minimum energy of vortex is approximately proportional to the integer which specifies the solution.

Azimuthal angle dependence of di-jet production in unpolarized hadron scattering

2009 ◽  
Author(s):  
Zhun Lu ◽  
Ivan Schmidt ◽  
Donald G. Crabb ◽  
Yelena Prok ◽  
Matt Poelker ◽  
...  
Keyword(s):  
Azimuthal Angle ◽  
Jet Production ◽  
Angle Dependence

scholarly journals Spin-Injection Terahertz Radiation in Magnetic Junctions

2012 ◽  
Vol 190 ◽  
pp. 153-156
Author(s):  
S.G. Chigarev ◽  
E.M. Epshtein ◽  
Y.V. Gulyaev ◽  
I.V. Malikov ◽  
G.M. Mikhailov ◽  
...  
Keyword(s):  
Joule Heating ◽  
Terahertz Radiation ◽  
Room Temperature ◽  
Radiation Power ◽  
Spin Injection ◽  
Point Contact ◽  
Ferromagnetic Film ◽  
Stimulated Radiation ◽  
Radiation Processes ◽  
Thermal Background

Electromagnetic radiation of 1 - 10 THz range is observed at room temperature in a structure with a point contact between a ferromagnetic rod and a thin ferromagnetic film under electric current of high enough density. The radiation is due to nonequilibrium spin injection between the components of the structure. By estimates, the injection can lead to inverted population of the spin subbands. The radiation power exceeds by orders of magnitude the thermal background (with the Joule heating taking into account) and follows the current without inertia. Efficiency of the oscillator depends strongly on the material used and quantum efficiency may exceed the unity. It means the stimulated radiation processes play an important role.

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