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  • 2015 European Conference on Lasers and Electro-Optics - European Quantum Electronics Conference
  • (Optica Publishing Group, 2015),
  • paper CD_8_6

Enhanced two-photon-absorption using sub-wavelength antennas

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Abstract

Two-photon absorption (TPA) in semiconductors is a third order non-linear optical process, allowing absorption of subbandgap photon pairs. However, TPA remains an intrinsically low efficient process. Therefore, photodetection based on TPA is generally used for autocorrelation measurements of pulsed laser sources, or high speed signal processing. Measurable levels of photocurrent at lower intensities can be reached only through electronic gain or light-matter interaction improvement.

© 2015 IEEE

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