Electroabsorption and retardation due to intersubband transitions in coupled quantum wells
| ISSN: |
1077-3118
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| Source: |
AIP Digital Archive
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| Topics: |
Physics
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| Notes: |
Electro-optical modulation due to intersubband transitions in a coupled quantum well structure is experimentally studied. By using an appropriate set of cross/parallel polarizer-analyzer measurements, we were able to resolve the contribution of electroabsorption and electroretardation to the overall modulation of the infrared light. Fitting the experimental results to a simple model that allows the quantum properties of the structure to vary with the applied electric field revealed that the most significant contribution to the modulation comes from linewidth broadening of the optical transition. We attribute this effect to a larger degree of localization of the envelope states near the interfaces that give rise to a faster dephasing time due to elastic scattering. © 1999 American Institute of Physics.
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| Type of Medium: |
Electronic Resource
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| URL: |