Ultrafast optical switching of terahertz metamaterials fabricated on ErAs/GaAs nanoisland superlattices |
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| Authors: | Chen Hou-Tong Padilla Willie J Zide Joshua M O Bank Seth R Gossard Arthur C Taylor Antoinette J Averitt Richard D |
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| Institution: | Los Alamos National Laboratory, New Mexico 87545, USA. chenht@lanl.gov |
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| Abstract: | We demonstrate optical switching of electrically resonant terahertz planar metamaterials fabricated on ErAs/GaAs 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 20 ps results from fast carrier recombination in the ErAs/GaAs superlattice substrates. |
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