Ultrafast optical switching of terahertz metamaterials fabricated on ErAs/GaAs nanoisland superlattices

摘要

We demonstrate optical switching of electrically resonant terahertz planar metamaterials fabricated onErAs/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.