4 May 2007 Optically tunable photonic crystals used as devices for the THz range
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In this work we report on structures operating as actively tunable filters or modulators for the terahertz spectral range. These devices can be described as one-dimensional photonic crystals with defects and are composed of quartz, MgO and GaAs thin platelets; the optically transparent materials (quartz and MgO) are used as Bragg mirrors forming a resonator and GaAs is placed inside this resonator. The tunability is achieved by photoexcitation of free carriers within the GaAs layer by an ultrashort laser pulse. The optical control of such devices features a very fast (sub-nanosecond) response which is attractive e.g. for future applications in telecommunications.
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Filip Kadlec, Filip Kadlec, Petr Kužel, Petr Kužel, } "Optically tunable photonic crystals used as devices for the THz range", Proc. SPIE 6581, Metamaterials II, 65810O (4 May 2007); doi: 10.1117/12.723348; https://doi.org/10.1117/12.723348

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