The effect of carrier-induced change on the optical properties of AlGaAs-GaAs intermixed quantum wells

Michael C.Y. Chan; Paul C.K. Kwok; E. Herbert Li

doi:10.1109/2944.720480

The effect of carrier-induced change on the optical properties of AlGaAs-GaAs intermixed quantum wells

Michael C.Y. Chan, Paul C.K. Kwok, E. Herbert Li

Hong Kong Metropolitan University

Research output: Contribution to journal › Article › peer-review

8 Citations (Scopus)

Abstract

The carrier-induced effects in the change of absorption and refractive index on the AlGaAs-GaAs intermixing modified quantum wells (QW's) have been investigated theoretically. Band-filling, bandgap shrinkage, and free-carrier absorption have been included for various carrier concentrations. The Schrödinger and the Poisson equations have been considered self-consistently. The polarized absorption coefficients are calculated using the Kane k · p method for a four band model and followed by the Kramers-Krönig transformation to obtain the refractive index change. The results obtained show a more enhanced bandgap renormalization and change of absorption, but a reduced change in refractive index for the larger intermixing extents. It is important to know the carrier-induced optical parameter changes the intermixed QW's because of their recent interests in photonics.

Original language	English
Pages (from-to)	685-694
Number of pages	10
Journal	IEEE Journal on Selected Topics in Quantum Electronics
Volume	4
Issue number	4
DOIs	https://doi.org/10.1109/2944.720480
Publication status	Published - Jul 1998

Keywords

Charge carrier processes
Optical refraction
Quantum wells
Quantum-well interdiffusion
Quantum-well intermixing

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10.1109/2944.720480

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title = "The effect of carrier-induced change on the optical properties of AlGaAs-GaAs intermixed quantum wells",

abstract = "The carrier-induced effects in the change of absorption and refractive index on the AlGaAs-GaAs intermixing modified quantum wells (QW's) have been investigated theoretically. Band-filling, bandgap shrinkage, and free-carrier absorption have been included for various carrier concentrations. The Schr{\"o}dinger and the Poisson equations have been considered self-consistently. The polarized absorption coefficients are calculated using the Kane k · p method for a four band model and followed by the Kramers-Kr{\"o}nig transformation to obtain the refractive index change. The results obtained show a more enhanced bandgap renormalization and change of absorption, but a reduced change in refractive index for the larger intermixing extents. It is important to know the carrier-induced optical parameter changes the intermixed QW's because of their recent interests in photonics.",

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AU - Chan, Michael C.Y.

AU - Kwok, Paul C.K.

AU - Li, E. Herbert

PY - 1998/7

Y1 - 1998/7

N2 - The carrier-induced effects in the change of absorption and refractive index on the AlGaAs-GaAs intermixing modified quantum wells (QW's) have been investigated theoretically. Band-filling, bandgap shrinkage, and free-carrier absorption have been included for various carrier concentrations. The Schrödinger and the Poisson equations have been considered self-consistently. The polarized absorption coefficients are calculated using the Kane k · p method for a four band model and followed by the Kramers-Krönig transformation to obtain the refractive index change. The results obtained show a more enhanced bandgap renormalization and change of absorption, but a reduced change in refractive index for the larger intermixing extents. It is important to know the carrier-induced optical parameter changes the intermixed QW's because of their recent interests in photonics.

AB - The carrier-induced effects in the change of absorption and refractive index on the AlGaAs-GaAs intermixing modified quantum wells (QW's) have been investigated theoretically. Band-filling, bandgap shrinkage, and free-carrier absorption have been included for various carrier concentrations. The Schrödinger and the Poisson equations have been considered self-consistently. The polarized absorption coefficients are calculated using the Kane k · p method for a four band model and followed by the Kramers-Krönig transformation to obtain the refractive index change. The results obtained show a more enhanced bandgap renormalization and change of absorption, but a reduced change in refractive index for the larger intermixing extents. It is important to know the carrier-induced optical parameter changes the intermixed QW's because of their recent interests in photonics.

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The effect of carrier-induced change on the optical properties of AlGaAs-GaAs intermixed quantum wells

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Keywords

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