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20 February 2012 Detection of ultrafast THz pulses via electro-absorption in coupled asymmetric quantum wells
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Abstract
We utilize quantum-confined Stark-effect in asymmetric double quantum wells (ADQW) to realize coherent detection of broadband THz pulses. For that, broadband THz transients formed by a two-color air plasma are focused onto ADQW, in turn dynamically shifting the ADQW bands, with the bandedge at ~ 825 nm. Spectrally-resolved detection scheme analyzes absorption modulation signatures imprinted onto the transmitted NIR probe spectrum. Use of only few micron thick samples ensures large detection bandwidth, currently demonstrated up to ~ 15 THz. Time-domain analysis of this signal shows pronounced bi-polar (coherent) as well as small unipolar components of the signal.
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Chia-Yeh Li, Denis V. Seletskiy, Jeffrey G. Cederberg, and Mansoor Sheik-Bahae "Detection of ultrafast THz pulses via electro-absorption in coupled asymmetric quantum wells", Proc. SPIE 8260, Ultrafast Phenomena and Nanophotonics XVI, 82600L (20 February 2012); https://doi.org/10.1117/12.907721
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