Two-photon photocurrent autocorrelation using intersubband transitions at nearly-resonant excitation


Two-photon photocurrent autocorrelation using intersubband transitions at nearly-resonant excitation

Schneider, H.; Maier, T.; Liu, H. C.; Walther, M.

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.

Keywords: intersubband transition; multiple quantum well; two-photon excitation; mid-infrared detector; ultrafast spectroscopy

  • Open Access Logo Optics Express 16(2008)3, 1523-1528

Permalink: https://www.hzdr.de/publications/Publ-10912
Publ.-Id: 10912