26 August 2010 Ultrafast bandgap photonics semiconductor phenomenology: response to ultra-short pulse laser
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Proceedings Volume 7780, Detectors and Imaging Devices: Infrared, Focal Plane, Single Photon; 778009 (2010); doi: 10.1117/12.858568
Event: SPIE NanoScience + Engineering, 2010, San Diego, California, United States
Abstract
It is known that ultra-fast laser is able to change solids physical state: to melt, to evaporate, to ionize. It is less known that ultra-fast laser is able to change semiconductor optical state: to bleach it. Such short time changes in semiconductor optical characteristics depend on the bandgap structure, therefore we are introducing the term - Ultrafast Bandgap Photonics. Phenomena of Ultrafast bandgap photonics are time-dependent and the optical effects are reversible: ultra-fast laser "bleaches" semiconductor and temporally changes spectral reflectivity, absorptivity, and transmittance as well as polarization characteristics. Applications of Ultra-fast bandgap photonics are remote control of semiconductor characteristics and material properties. Ultrafast Bandgap Photonics effects may temporally alter photodetector's fundamental characteristics - responsivity and detectivity as well as its response time and spectral bandwidth - all of these may happen without changes in photodetector electrical response. While Ultrafast Bandgap Photonics applications are directly depend on pulse dwell time and pulse repetition rate; it is important to say that laser energy per pulse should be carefully managed. In this paper we discuss some foundations of ultra-fast bandgap photonics - specifically for low pulse energy ultrafast laser.
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Michael K. Rafailov, "Ultrafast bandgap photonics semiconductor phenomenology: response to ultra-short pulse laser", Proc. SPIE 7780, Detectors and Imaging Devices: Infrared, Focal Plane, Single Photon, 778009 (26 August 2010); doi: 10.1117/12.858568; https://doi.org/10.1117/12.858568
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KEYWORDS
Semiconductors

Ultrafast phenomena

Electrons

Photonics

Semiconductor lasers

Photons

Pulsed laser operation

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