To monitor the density of photo-generated charge carriers on a semiconductor surface, we demonstrate a detectorless imaging system based on the analysis of the optical feedback in terahertz quantum cascade lasers. Photo-excited free electron carriers are created in high resistivity n-type silicon wafers via low power (congruent to 40 mW/cm(2)) continuous wave pump laser in the near infrared spectral range. A spatial light modulator allows to directly reconfigure and control the photo-patterned intensity and the associated free-carrier density distribution. The experimental results are in good agreement with the numerical simulations.

Imaging of free carriers in semiconductors via optical feedback in terahertz quantum cascade lasers / Mezzapesa, F. P.; Columbo, L. L.; Brambilla, Massimo; Dabbicco, M.; Vitiello, M. S.; Scamarcio, G.. - In: APPLIED PHYSICS LETTERS. - ISSN 0003-6951. - STAMPA. - 104:4(2014). [10.1063/1.4863671]

Imaging of free carriers in semiconductors via optical feedback in terahertz quantum cascade lasers

BRAMBILLA, Massimo;
2014-01-01

Abstract

To monitor the density of photo-generated charge carriers on a semiconductor surface, we demonstrate a detectorless imaging system based on the analysis of the optical feedback in terahertz quantum cascade lasers. Photo-excited free electron carriers are created in high resistivity n-type silicon wafers via low power (congruent to 40 mW/cm(2)) continuous wave pump laser in the near infrared spectral range. A spatial light modulator allows to directly reconfigure and control the photo-patterned intensity and the associated free-carrier density distribution. The experimental results are in good agreement with the numerical simulations.
2014
Imaging of free carriers in semiconductors via optical feedback in terahertz quantum cascade lasers / Mezzapesa, F. P.; Columbo, L. L.; Brambilla, Massimo; Dabbicco, M.; Vitiello, M. S.; Scamarcio, G.. - In: APPLIED PHYSICS LETTERS. - ISSN 0003-6951. - STAMPA. - 104:4(2014). [10.1063/1.4863671]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/3734
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