Nonlinear absorption characteristics of piezopolar semiconductor plasmas

2020 ◽  
Author(s):  
Ratna Agrawal ◽  
Ravi Vanshpal ◽  
Swati Dubey ◽  
S. Ghosh
Keyword(s):  
Nonlinear Absorption ◽  
Semiconductor Plasmas ◽  
Absorption Characteristics

scholarly journals Wavelength-Dependent Nonlinear Absorption in Palladium Nanoparticles

2021 ◽  
Vol 11 (4) ◽  
pp. 1640
Author(s):  
Chunyu Chen ◽  
Jun Wang ◽  
Yachen Gao
Keyword(s):  
Surface Plasmon Resonance ◽  
Excitation Energy ◽  
Systematic Study ◽  
Nonlinear Absorption ◽  
Palladium Nanoparticles ◽  
Excitation Wavelength ◽  
Saturated Absorption ◽  
Multi Wavelength ◽  
Resonant Region ◽  
Absorption Characteristics

This paper aims to study the nonlinear absorption characteristics of palladium nanoparticles (PdNPs) at off-resonant wavelengths. For this purpose, multi-wavelength (500–650 nm) nanosecond Z-scan technique was used. The experimental results indicate that saturated absorption (SA) and the transition from SA to reverse saturated absorption (RSA) can occur, and depends on the excitation wavelength and energy. When the excitation wavelength is constant, with the increase of excitation energy, PdNPs change from SA to RSA. When the excitation energy is constant, with the excitation wavelength approaching surface plasmon resonance (SPR), PdNPs change from SA to RSA. This phenomenon of SA and RSA under multi-wavelength excitation in the off-resonant region provides a supplement for the systematic study of the nonlinear absorption of PdNPs.

NONLINEAR OPTICAL PARAMETERS OF MAGNETOACTIVE SEMICONDUCTOR-PLASMAS

2008 ◽  
Vol 22 (22) ◽  
pp. 3877-3887
Author(s):  
M. SINGH ◽  
D. JOSEPH ◽  
S. DUHAN
Keyword(s):  
Magnetic Field ◽  
Refractive Index ◽  
Absorption Coefficient ◽  
Nonlinear Absorption ◽  
Nonlinear Optical ◽  
Doping Concentration ◽  
Liquid Nitrogen Temperature ◽  
Transverse Magnetic ◽  
Optical Parameters ◽  
Semiconductor Plasmas

The nonlinear optical parameters (absorption coefficient and refractive index) of semiconductor-plasmas subjected to a transverse magnetic field have been investigated analytically. By employing the coupled-mode scheme, an expression of third-order optical susceptibility and resultant nonlinear absorption and refractive index of the medium are obtained. The analysis has been applied to both cases, viz., centrosymmetric (β = 0) and noncentrosymmetric (β ≠ 0) in the presence of magnetic field. The numerical estimates are made for InSb crystal at liquid nitrogen temperature duly irradiated by a 10-nanosecond pulsed 10.6 μm CO 2 laser. The influence of doping concentration and magnetic field on both the nonlinear absorption and refractive index has been explored, and the results are found to be well in agreement with theory and experiment. Analysis further establishes that absorption coefficient and refractive index can be controlled with precision in semiconductors by the proper selection of doping concentration and an external magnetic field, and hence these media may be used for fabrication of fast cubic nonlinear optical devices under off-resonant transition regime.

Controlling the nonlinear absorption characteristics of TiO2/carbon nanocomposites on films

2018 ◽  
Vol 108 ◽  
pp. 510-514 ◽  
Author(s):  
Ahmet Karatay ◽  
Yusuf Osman Donar ◽  
Ali Sınağ ◽  
Ayhan Elmali
Keyword(s):  
Nonlinear Absorption ◽  
Carbon Nanocomposites ◽  
Absorption Characteristics

Optical nonlinear absorption characteristics of crystalline Ge2Sb2Te5 thin films

2011 ◽  
Vol 110 (3) ◽  
pp. 033503 ◽  
Author(s):  
Shuang Liu ◽  
Jingsong Wei ◽  
Fuxi Gan
Keyword(s):  
Thin Films ◽  
Nonlinear Absorption ◽  
Absorption Characteristics

Optical nonlinear absorption characteristics of Sb2Se3 nanoparticles

2014 ◽  
Author(s):  
Molli Muralikrishna ◽  
Aditha Sai Kiran ◽  
B. Ravikanth ◽  
P. Sowmendran ◽  
V. Sai Muthukumar ◽  
...  
Keyword(s):  
Nonlinear Absorption ◽  
Absorption Characteristics
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