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Extremely low-intensity optical nonlinearity in asymmetric coupled quantum wells (1987)

Little, J. W. ; Whisnant, J. K. ; Leavitt, Richard P. ; [et al.]

Woodbury, NY : American Institute of Physics (AIP)

Applied Physics Letters 51 (1987), S. 1786-1788

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ISSN: 1077-3118

Source: AIP Digital Archive

Topics: Physics

Notes: We have observed an intensity-dependent shift in the exciton absorption features for a system of coupled quantum wells in which a thin barrier separates two wells of unequal widths. We found that for a fixed external bias on the sample, the normal quantum Stark shift of the excitons in the wells was suppressed when light of 1 μW/cm2 intensity was used to measure the absorption. The shift became systematically larger as the light intensity was decreased to as low as 100 pW/cm2. This extremely low-level nonlinearity may be due to internal fields that arise when free electrons and holes are separated within the coupled-well system.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1063/1.98522

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