Low Threshold ZnSe1−x Tex Optical Limiters

1994 ◽  
Vol 374 ◽  
Author(s):  
W. Ji ◽  
H. S. Tan ◽  
Z. C. Feng ◽  
P. Becla
Keyword(s):  
Laser Pulses ◽  
Free Carrier ◽  
Charge Carriers ◽  
Nanosecond Laser ◽  
Free Charge ◽  
Limiting Behavior ◽  
Optical Limiters ◽  
Low Threshold ◽  
Nanosecond Laser Pulses ◽  
Limiting Threshold

AbstractWe report an experimental investigation of optical limiting with bulk ZnSe1−xTex crystals at wavelengths just below the band edge, using nanosecond laser pulses. The limiting threshold as low as a few mJ/cm2 has been demonstrated. The generation of free charge carriers by singlephoton absorption, and subsequent free-carrier nonlinearities (nonlinear absorption and selfdefocusing) are responsible for the limiting behavior.

Formation of Periodical Sub-Micron Sized Structures on Silicon by Interfered Nanosecond Laser Pulses

2010 ◽  
Vol 97-101 ◽  
pp. 3803-3806
Author(s):  
Yong Xiang Hu ◽  
Heng Zhang ◽  
Zheng Qiang Yao
Keyword(s):  
Cost Effective ◽  
Laser Pulses ◽  
Laser Beams ◽  
Nanosecond Laser ◽  
Effective Technique ◽  
First Order ◽  
Direct Fabrication ◽  
Cost Effective Technique ◽  
Nanosecond Laser Pulses ◽  
Micro Structuring

Laser interference micro-structuring is a relatively efficient and cost-effective technique for fabricating periodical micro-nano-structuring surfaces. The direct fabrication of sub-micron sized dot array on silicon was performed by four interfering nanosecond laser beams with a diffractive beam splitter. The mechanism to form the dot array was analyzed and it was found that the obtained conical dot array had a negative shape of the interference pattern of four laser beams. A second-order peak between two first-order peaks also occurred due to the liquid-solid expansion.

scholarly journals Dynamics of Strong Coupling Between Free Charge Carriers in Organometal Halide Perovskites and Aluminum Plasmonic States

2022 ◽  
Vol 9 ◽  
Author(s):  
Yang Luo ◽  
Hai Wang ◽  
Le-Yi Zhao ◽  
Yong-Lai Zhang
Keyword(s):  
Strong Coupling ◽  
Transient Absorption ◽  
Perovskite Solar Cells ◽  
Coupled System ◽  
Free Carrier ◽  
Charge Carriers ◽  
Free Charge ◽  
Free Carriers ◽  
Halide Perovskites ◽  
Poor Absorption

We have investigated a strong coupled system composed of a MAPbIxCl3-x perovskite film and aluminum conical nanopits array. The hybrid states formed by surface plasmons and free carriers, rather than the traditional excitons, is observed in both steady-state reflection measurements and transient absorption spectra. In particular, under near upper band resonant excitation, the bleaching signal from the band edge of uncoupled perovskite was completely separated into two distinctive bleaching signals of the hybrid system, which is clear evidence for the formation of strong coupling states between the free carrier–plasmon state. Besides this, a Rabi splitting up to 260 meV is achieved. The appearance of the lower bands can compensate for the poor absorption of the perovskite in the NIR region. Finally, we found that the lifetime of the free carrier–SP hybrid states is slightly shorter than that of uncoupled perovskite film, which can be caused by the ultrafast damping of the SPs modes. These peculiar features on the strong coupled hybrid states based on free charge carriers can open new perspectives for novel plasmonic perovskite solar cells.

scholarly journals Laser Formation of Periodic Micro- and Nanostructures on the Surface of Monocrystalline Silicon

2020 ◽  
Vol 21 (2) ◽  
pp. 215-218
Author(s):  
I. A. Mohylyak ◽  
O. Yu. Bonchyk ◽  
S. A. Korniy ◽  
S. G. Kiyak ◽  
D. I. Popovych
Keyword(s):  
Periodic Structures ◽  
Experimental Studies ◽  
Laser Pulses ◽  
Pulse Mode ◽  
Semiconductor Surface ◽  
Nanosecond Laser ◽  
Periodic Nanostructures ◽  
Nanosecond Laser Pulses ◽  
Electron Microscopes ◽  
Microscopic Investigations

Experimental studies of the features of the formation of laser-induced periodic nanostructures on the surface of silicon wafers in the zones of action of second, millisecond and nanosecond laser pulses are conducted in the work. The results of microscopic investigations by optical and electron microscopes of periodic structures formed on surfaces with crystallographic orientation (111), (100) are presented. The obtained results can be used to optimize the laser pulse mode for controlled micro- nanostructuring of the semiconductor surface.

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