7 March 2014 Active metasurfaces
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Abstract
An innovative method of examining properties of metasurfaces is presented. A pump-probe technique is used to create a metasurface composed of conductive shapes on a silicon surface. A wave-front of intense pulse of 82 fs from Ti:Sa laser with wavelength of 800 nm is shaped by a spatial light modulator and then focused into a preprogrammed array of vshaped features on a high purity float zone silicon substrate. The laser pulse generates electron-hole pairs on the silicon substrate, thus a metasurface consisting of an array of metal-like v-shaped antennas is inscribed on the silicon substrate. The lifetime of v-shaped antennas is in millisecond time range. In the meantime, the second, less intense pulse, also of wavelength 800 nm is converted to a pulse of terahertz radiation with a peak-power at wavelength approximately 800 μm and used to probe the metasurface inscribed in the silicon. Tracing the position of the refracted terahertz beam is achieved with a specially designed INO video camera for terahertz radiation.
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Ada-Simona Popescu, Ada-Simona Popescu, Tamelia Ali, Tamelia Ali, Igor Bendoym, Igor Bendoym, Simeon Bikorimana, Simeon Bikorimana, Roger Dorsinville, Roger Dorsinville, Linda Marchese, Linda Marchese, Alain Bergeron, Alain Bergeron, Marc Terroux, Marc Terroux, Andrii B. Golovin, Andrii B. Golovin, David T. Crouse, David T. Crouse, } "Active metasurfaces", Proc. SPIE 8985, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VII, 89850Z (7 March 2014); doi: 10.1117/12.2040372; https://doi.org/10.1117/12.2040372
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