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2008
Journal Article
Title
Two-photon photocurrent autocorrelation using intersubband transitions at nearly-resonant excitation
Other Title
Zweiphotonen Photostrom Autokorrelation von Intersubbandübergängen bei nahezu resonanter Anregung
Abstract
We investigate nonlinear mid-infrared detection via two-photon transitions involving two bound subbands and one continuum resonance in an n-type multiple quantum well. By varying the excitation energy, we have tuned the two-photon transition from resonant, yielding optimum resonant enhancement with a real intermediate state, to nearly-resonant, with a virtual but resonantly enhanced intermediate state. For autocorrelation purposes, the latter configuration improves time resolution whilst partially retaining a resonant enhancement of the two-photon transition strength.
Author(s)