Enhancing all-optical switching by localizing the control and signal light fields in the same defect region

2007 ◽  
Vol 24 (9) ◽  
pp. 2141 ◽  
Author(s):  
Hui Zou ◽  
Guan-Quan Liang ◽  
He-Zhou Wang
Keyword(s):  
Optical Switching ◽  
Light Fields ◽  
Defect Region ◽  
Signal Light ◽  
All Optical ◽  
All Optical Switching

scholarly journals All-Optical Switching In A Medium of A Four-Level Vee-Cascade Atomic Medium

2021 ◽  
Author(s):  
Khoa Dinh Xuan ◽  
Ai Nguyen Van ◽  
Dong Hoang Minh ◽  
Doai Le Van ◽  
Bang Nguyen Huy
Keyword(s):  
Optical Switching ◽  
Electromagnetically Induced Transparency ◽  
Probe Field ◽  
Storage Devices ◽  
Signal Light ◽  
All Optical ◽  
Electromagnetically Induced Absorption ◽  
Induced Transparency ◽  
All Optical Switching ◽  
Signal Field

Abstract We proposed a model for all-optical switching in a medium consisting of four-level vee-cascade atomic systems excited by coupling, probe, and signal fields. It is shown that, by changing the intensity or the frequency of the signal field, the medium can be actively switched between either electromagnetically induced transparency (EIT) or electromagnetically induced absorption (EIA), which has behavior of all-optical switching. As a result, a cw probe field is switched into square pulses by modulating the intensity or the frequency of the signal light. Furthermore, width of the square probe pulses can be controlled by tuning the switching period of the signal field. Such a tuneable all-optical switching is useful for finding related applications in optic communications and optical storage devices.

scholarly journals All-Optical Switching Based on the Plasma Channel Induced by Laser Pulses

2018 ◽  
Vol 2018 ◽  
pp. 1-7
Author(s):  
Chao Tan ◽  
Binliang Hu ◽  
Shiping Zhan ◽  
Yonghua Hu ◽  
Bin Zhong
Keyword(s):  
Optical Switching ◽  
Plasma Channel ◽  
Laser Pulses ◽  
Dark Spot ◽  
Incident Intensity ◽  
Signal Light ◽  
All Optical ◽  
Signal Laser ◽  
All Optical Switching ◽  
Control Laser

We display a theoretical and experimental study of all-optical switching for signal lasers based on the plasma channel induced by the control laser. Using the plasma channel generated in the carbon disulfide (CS2) solution, the signal light can be modulated as some spatial distributions including unchanging, ring-shaped beam, and other intensity profiles. The modulation on the signal light can be conveniently adjusted by changing the control light’s incident intensity distribution. We can infer the dark spot shape in the modulated signal laser through the intensity profile of control laser beam. These results provide the great potential of plasma channel induced by lasers as an all-optical switching for various optoelectronic applications.

scholarly journals Ultraviolet All-Optical Switching via Zinc Oxide Thin Films

2020 ◽  
Vol 1 (1) ◽  
Author(s):  
Trenten Andrew Smith ◽  
Samuel J Haeuser ◽  
Seth T King ◽  
Eric J Gansen
Keyword(s):  
Zinc Oxide ◽  
Optical Switching ◽  
Short Wave ◽  
Wide Bandgap ◽  
Optical Switches ◽  
Control Pulse ◽  
Signal Pulse ◽  
Signal Light ◽  
All Optical ◽  
All Optical Switching

Zinc oxide (ZnO) is a semiconductor material exhibiting a wide bandgap in the ultraviolet (UV) region. ZnO is a promising material for use in short-wave optoelectronic devices such as all-optical switches (AOSs). Our switch is composed of a polycrystalline ZnO thin film grown by DC sputter deposition and uses a 120ps control pulse tuned to the band edge of the film to modify the transmission of a weaker signal pulse. The signal light is heavily absorbed in the absence of the control pulse, representing an off state of the switch. The control pulse, when incident on the film, resonantly excites electrons to create excitons. This decreases the material’s absorption by filling energy states and screening the built-in electric field of the ZnO. Consequently, more signal light is transmitted by the film, representing an on state.

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