A near-room-temperature all-optical polarization switch based on the excitation of spin-polarized “virtual” carriers in quantum wells

Near-room-temperature operation of an all-optical polarization switch based on the virtual excitation of spin-polarized carriers in semiconductor quantum wells is demonstrated. The device is shown to exhibit a pulse-width-limited switching time, a contrast ratio of >18dB, an optical bandwidth of...

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Published in:Journal of applied physics 2005-09, Vol.98 (6)
Main Authors: Yildirim, Murat, Prineas, J. P., Gansen, Eric J., Smirl, Arthur L.
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Language:English
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description Near-room-temperature operation of an all-optical polarization switch based on the virtual excitation of spin-polarized carriers in semiconductor quantum wells is demonstrated. The device is shown to exhibit a pulse-width-limited switching time, a contrast ratio of >18dB, an optical bandwidth of ∼3THz, and an energy throughput of >0.1% using a thin (40 wells) GaAs∕AlGaAs sample. The results of differential transmission measurements are used to identify the dominant switching mechanisms and to monitor the spin and temporal dynamics of the carriers excited during the operation of the switch.
doi_str_mv 10.1063/1.2042531
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title A near-room-temperature all-optical polarization switch based on the excitation of spin-polarized “virtual” carriers in quantum wells
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