Journal
APPLIED PHYSICS LETTERS
Volume 104, Issue 4, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4863671
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Funding
- MASSIME
- National Firb Project PHOCOS [RBFR08E7VA]
- Italian Ministry of Education, University, and Research (MIUR)
- [MIUR-PON02-0576 INNOVHEAD]
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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. (C) 2014 AIP Publishing LLC.
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