Combined local and carrier transport optical nonlinearities in a hetero n-i-p-i structure
- 11 March 1991
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 58 (10) , 1018-1020
- https://doi.org/10.1063/1.104410
Abstract
Nonlinear optical effects have been measured in a novel hetero n‐i‐p‐i structure with strained InAs/GaAs superlattices as the quantum wells. For intensities below 6 W/cm2, changes in transmission are observed due to the screening of built‐in fields in conjunction with the quantum‐confined Stark effect. For intensities greater than 30 W/cm2, a further increase in transmission is observed due to state filling and exciton screening in the wells. It is demonstrated that a n‐i‐p‐i structure, because of its lengthened carrier lifetime, can be used to reduce the intensity necessary for exciton saturation and state filling in quantum wells when the wells are placed in the i regions. Total changes in transmission greater than 25% have been seen, with no sign that the nonlinearity is saturating at 1 kW/cm2 (the highest excitation used here).Keywords
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