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

Beat excitation of terahertz radiation in a semiconductor slab in a magnetic field

2012 ◽  
Vol 73 (2) ◽  
pp. 269-274 ◽  
Author(s):  
Manish Kumar ◽  
Lalita Bhasin ◽  
V.K. Tripathi
Keyword(s):  
Magnetic Field ◽  
Terahertz Radiation

scholarly journals Reorientation of α-Fe2O3crystallites in an external magnetic field

2014 ◽  
Vol 70 (a1) ◽  
pp. C165-C165
Author(s):  
Michał Stękiel ◽  
Radosław Przeniosło ◽  
Dariusz Wardecki ◽  
Thomas Buslaps ◽  
Jacek Jasiński
Keyword(s):  
Magnetic Field ◽  
Angular Distribution ◽  
External Field ◽  
Intensity Distribution ◽  
Azimuthal Angle ◽  
Magnetic Interaction ◽  
Cylindrical Container ◽  
Ambient Conditions ◽  
X Ray ◽  
Weak Ferromagnetic

The magnetic interaction between the crystallites of weak ferromagnetic α-Fe2O3 has been studied by combining SR based X-ray diffraction with an externally applied magnetic field. The measurements were performed with several polycrystalline α-Fe2O3 [1,2] samples (dry or in suspensions) placed in a half-filled cylindrical container in ambient conditions. The axis of the cylindrical container was oriented vertically parallel to the applied dc magnetic field. The polycrystalline sample had a free surface, so the α-Fe2O3 crystallites were free to move. The full Debye-Scherrer diffraction rings were measured with a 2D pixel detector at the beamline ID-15B at ESRF. In the absence of the magnetic field the intensity distribution over azimuthal angle was a uniform, i.e. there was no texture. The applied maximal field, B=0.9T was too small to change the magnetic ordering of α-Fe2O3 but it was sufficiently strong to reorient large amount of crystallites in order to minimize the angle between their ferromagnetic moment direction and the external field. Pronounced texture patterns with clear maxima in the angular distribution of the intensity across each Debye-Scherrer ring were observed. The observed textured intensity distribution was analyzed quantitatively by using a model based on the magnetic anisotropy observed in single crystals of α-Fe2O3. The analysis yielded two important parameters: (i) the width of the angular distribution of the ferromagnetic moments directions around the external field direction, and (ii) the relative quantity of the crystallites that did reorient in the external field. The α-Fe2O3 samples were also characterized with TEM technique. The analysis of X-ray and TEM studies provide new conclusions about the magnetic interaction between the α-Fe2O3 crystallites [3]. The proposed measurement technique can be applied to study other weak ferromagnetic materials.

Submilliwatt, short-pulse, terahertz radiation from femtosecond-laser irradiated InAs in a magnetic field

1998 ◽  
Author(s):  
N. Sarukura ◽  
H. Ohtake ◽  
S. Izumida ◽  
Zhenlin Liu ◽  
S. Ono ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Femtosecond Laser ◽  
Terahertz Radiation ◽  
Short Pulse

Radiation Power of a High-Current Vacuum Arc Stabilized by an Axial Magnetic Field in the Visible and UV Ranges of the Spectrum

2021 ◽  
Vol 47 (2) ◽  
pp. 118-121
Author(s):  
Yu. A. Barinov ◽  
K. K. Zabello ◽  
A. A. Logachev ◽  
I. N. Poluyanova ◽  
E. V. Sherstnev ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Axial Magnetic Field ◽  
Radiation Power ◽  
Vacuum Arc ◽  
High Current

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.

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