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Ultrafast optical switching of terahertz metamaterials fabricated on Er As Ga As nanoisland superlattices

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Abstract

We demonstrate optical switching of electrically resonant terahertz planar metamaterials fabricated on ErAsGaAs nanoisland superlattice substrates. Photoexcited charge carriers in the superlattice shunt the capacitive regions of the constituent elements, thereby modulating the resonant response of the metamaterials. A switching recovery time of 20ps results from fast carrier recombination in the ErAsGaAs superlattice substrates.

© 2007 Optical Society of America

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