Electrooptic effects in GaAs-AlGaAs narrow coupled quantum wells

M P Earnshaw, D W E Allsopp

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

The linear and quadratic electrooptic coefficients in narrow single and strongly coupled GaAs-AlxGa1-xAs quantum wells have been measured, The quadratic electrooptic effect is enhanced over that of conventional square quantum wells for both TE and TM polarization in all the structures considered, by up to six times in the case of 2-nm-wide GaAs-Al0.2Ga0.8 As strongly coupled quantum wells. The origin of the enhanced quadratic electrooptic effect was found to correlate with a larger red shift in the absorption edge exciton and strong Coulombic coupling of the bound exciton states with the quasi-continua.
Original languageEnglish
Pages (from-to)897-904
Number of pages8
JournalIEEE Journal of Quantum Electronics
Volume37
Issue number7
Publication statusPublished - 2001

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Electrooptical effects
Semiconductor quantum wells
electro-optics
aluminum gallium arsenides
quantum wells
Excitons
excitons
red shift
Polarization
continuums
polarization
coefficients

Cite this

Electrooptic effects in GaAs-AlGaAs narrow coupled quantum wells. / Earnshaw, M P; Allsopp, D W E.

In: IEEE Journal of Quantum Electronics, Vol. 37, No. 7, 2001, p. 897-904.

Research output: Contribution to journalArticle

Earnshaw, MP & Allsopp, DWE 2001, 'Electrooptic effects in GaAs-AlGaAs narrow coupled quantum wells', IEEE Journal of Quantum Electronics, vol. 37, no. 7, pp. 897-904.
Earnshaw, M P ; Allsopp, D W E. / Electrooptic effects in GaAs-AlGaAs narrow coupled quantum wells. In: IEEE Journal of Quantum Electronics. 2001 ; Vol. 37, No. 7. pp. 897-904.
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AB - The linear and quadratic electrooptic coefficients in narrow single and strongly coupled GaAs-AlxGa1-xAs quantum wells have been measured, The quadratic electrooptic effect is enhanced over that of conventional square quantum wells for both TE and TM polarization in all the structures considered, by up to six times in the case of 2-nm-wide GaAs-Al0.2Ga0.8 As strongly coupled quantum wells. The origin of the enhanced quadratic electrooptic effect was found to correlate with a larger red shift in the absorption edge exciton and strong Coulombic coupling of the bound exciton states with the quasi-continua.

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