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.

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 Au Nanoparticles-Doped Polymer All-Optical Switches Based on Photothermal Effects

Polymers ◽  
2020 ◽  
Vol 12 (9) ◽  
pp. 1960 ◽  
Author(s):  
Yue Cao ◽  
Daming Zhang ◽  
Yue Yang ◽  
Baizhu Lin ◽  
Jiawen Lv ◽  
...  
Keyword(s):  
Power Consumption ◽  
Optical Switching ◽  
Au Nanoparticles ◽  
Optical Switches ◽  
Order Mode ◽  
Mode Switch ◽  
First Order ◽  
All Optical ◽  
Doped Polymer ◽  
All Optical Switching

This article demonstrated the Au nanoparticles-doped polymer all-optical switches based on photothermal effects. The Au nanoparticles have a strong photothermal effect, which would generate the inhomogeneous thermal field distributions in the waveguide under the laser irradiation. Meanwhile, the polymer materials have the characteristics of good compatibility with photothermal materials, low cost, high thermo-optical coefficient and flexibility. Therefore, the Au nanoparticles-doped polymer material can be applied in optically controlled optical switches with low power consumption, small device dimension and high integration. Moreover, the end-pumping method has a higher optical excitation efficiency, which can further reduce the power consumption of the device. Two kinds of all-optical switching devices have been designed including a base mode switch and a first-order mode switch. For the base mode switch, the power consumption and the rise/fall time were 2.05 mW and 17.3/106.9 μs, respectively at the wavelength of 650 nm. For the first-order mode switch, the power consumption and the rise/fall time were 0.5 mW and 10.2/74.9 μs, respectively at the wavelength of 532 nm. This all-optical switching device has the potential applications in all-optical networks, flexibility device and wearable technology fields.

scholarly journals All-optical switching in dye-doped DNA nanofibers

2019 ◽  
Vol 7 (1) ◽  
pp. 170-176 ◽  
Author(s):  
Adam Szukalski ◽  
Maria Moffa ◽  
Andrea Camposeo ◽  
Dario Pisignano ◽  
Jaroslaw Mysliwiec
Keyword(s):  
Optical Switching ◽  
Optical Switches ◽  
Electrospun Fibers ◽  
All Optical ◽  
All Optical Switching ◽  
Pyrazoline Derivative

Electrospun fibers made of DNA semi-intercalated with a push–pull, luminescent nonlinear pyrazoline derivative are introduced as novel all-optical switches.

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.

Pulse optimization for all-optical switching engineered in photonic crystal waveguide with micro-resonator

2017 ◽  
Vol 26 (04) ◽  
pp. 1750050
Author(s):  
Dragan Vujic
Keyword(s):  
Photonic Crystal ◽  
Optical Switching ◽  
Optical Switches ◽  
Shape Preservation ◽  
Quality Factors ◽  
Cavity Transmission ◽  
Pulse Distortion ◽  
All Optical ◽  
All Optical Switching ◽  
Buildup Time

We have investigated switching properties and especially pulse shape preservation in the process of all-optical switching. To this end, we made two different designs of all-optical switches based on two-dimensional (2D) photonic crystal (PC) waveguides with different dispersive properties and micro-resonators with different quality factors. We realized numerically that all-optical switching without or with marginal temporal pulse distortion can be obtained under precisely chosen conditions on pulse duration and detuning. In particular, the former has to be approximately 2.5 times longer than cavity buildup time and the latter has to be equal to one full width at half maximum of the cavity transmission spectrum.

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