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Electrorefraction associated with Wannier-Stark localization in strongly coupled three-quantum-well structures

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Title Electrorefraction associated with Wannier-Stark localization in strongly coupled three-quantum-well structures
 
Creator BHATNAGAR, A
ALLSOPP, DWE
CHEN, X
EARNSHAW, MP
BATTY, W
 
Subject electric-field
refractive-index
wave-guides
absorption-coefficient
optical modulator
phase modulation
low-voltage
superlattices
electroabsorption
coupled quantum wells
electroabsorption
electrorefraction
stark ladders
wannier-stark effect
 
Description Wannier-Stark localization of heavy holes and the associated refractive index changes in a strongly coupled GaAs-Al0.75Ga0.25As three-quantum-well structure have been investigated. Electroabsorption has been measured for TE polarization and the results compared with simulations performed by the exciton Green's function method to reveal the dominant contributions to the differential absorption at low applied electric Field. The refractive index changes calculated by Kramers-Kronig transformation are large compared with those arising from the quantum-confined Stark effect in conventional square quantum wells and are shown to derive from the emergence of only first-order ladder states due to the strong localization of heavy holes. Preliminary experimental confirmation of strong electrorefraction associated with heavy-hole state localization is obtained at 80 meV detuning. This effect is potentially useful for electrooptic device applications.
 
Publisher IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
 
Date 2011-08-01T02:16:17Z
2011-12-26T12:53:14Z
2011-12-27T05:40:28Z
2011-08-01T02:16:17Z
2011-12-26T12:53:14Z
2011-12-27T05:40:28Z
2000
 
Type Article
 
Identifier IEEE JOURNAL OF QUANTUM ELECTRONICS, 36(6), 702-707
0018-9197
http://dx.doi.org/10.1109/3.845727
http://dspace.library.iitb.ac.in/xmlui/handle/10054/8313
http://hdl.handle.net/10054/8313
 
Language en