Optimization of intersubband resonant second-order susceptibility in asymmetric graded AlxGa1-xAs quantum wells using supersymmetric quantum mechanics

Tomic, S ORCID: https://orcid.org/0000-0003-3622-6960, Milanović, V and Ikonić, Z 1997, 'Optimization of intersubband resonant second-order susceptibility in asymmetric graded AlxGa1-xAs quantum wells using supersymmetric quantum mechanics' , Physical Review B, 56 (3) , pp. 1033-1036.

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Abstract

A systematic procedure is proposed for the design of ternary alloys based quantum-well structures optimized for double-resonance second-harmonic generation. The method relies on the supersymmetric quantum mechanics as derived here for the case of position-dependent effective mass. Starting from a symmetric, truncated quasiparabolic potential, itself lacking any second-order nonlinearity, we generate a family of asymmetric potentials, fully isospectral with the starting potential, and choose the one which maximizes the product of transition matrix elements relevant for the second-order nonlinearity. Realization of the optimized potential (in an approximate manner) by grading the ternary alloy AlxGa1-xAs is then described. The best value of nonlinear susceptibility obtained exceeds those reported in the literature.

Item Type:	Article
Themes:	Energy
Schools:	Schools > School of Computing, Science and Engineering > Salford Innovation Research Centre
Journal or Publication Title:	Physical Review B
Publisher:	American Physical Society
Refereed:	Yes
ISSN:	0163-1829
Depositing User:	Prof Stanko Tomic
Date Deposited:	07 Nov 2011 12:31
Last Modified:	16 Feb 2022 13:32
URI:	https://usir.salford.ac.uk/id/eprint/18894

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