Publication

Utilizing electromagnetically induced transparency in InAs quantum dots for all-optical transistor design

Hamed Sattari
2017
Journal Articles

Abstract

We propose a multilayer medium with semiconductor quantum dot nano-structures as a defect layer for all-optical control of the 1.55 mu m probe beam. The effect of the coupling field and incoherent pump on absorption and dispersion properties of the quantum dot defect layer is investigated. Depending on the intensity of the coupling field and rate of the incoherent pump field, the possibility of the absorption cancellation and even amplification are demonstrated. The optimum values of the coupling field intensity and incoherent pump field for complete transmission or amplification are obtained. The dynamical behavior of the structure is investigated, and the estimated switching time scales are about tens of picoseconds. (C) 2017 Optical Society of America

Official source

https://infoscience.epfl.ch/entities/publication/ea8ec36c-e1a3-4c0b-b653-4a73c29f6e25

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Hamed Sattari
2017
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/ea8ec36c-e1a3-4c0b-b653-4a73c29f6e25

About this result

Related concepts (20)

Quantum dot

Quantum dots (QDs) – also called semiconductor nanocrystals, are semiconductor particles a few nanometres in size, having optical and electronic properties that differ from those of larger particles as a result of quantum mechanics. They are a central topic in nanotechnology and materials science. When the quantum dots are illuminated by UV light, an electron in the quantum dot can be excited to a state of higher energy. In the case of a semiconducting quantum dot, this process corresponds to the transition of an electron from the valence band to the conductance band.

Optical transistor

An optical transistor, also known as an optical switch or a light valve, is a device that switches or amplifies optical signals. Light occurring on an optical transistor's input changes the intensity of light emitted from the transistor's output while output power is supplied by an additional optical source. Since the input signal intensity may be weaker than that of the source, an optical transistor amplifies the optical signal. The device is the optical analog of the electronic transistor that forms the basis of modern electronic devices.

Optical computing

Optical computing or photonic computing uses light waves produced by lasers or incoherent sources for data processing, data storage or data communication for computing. For decades, photons have shown promise to enable a higher bandwidth than the electrons used in conventional computers (see optical fibers). Most research projects focus on replacing current computer components with optical equivalents, resulting in an optical digital computer system processing binary data.

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