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NeРњРЉmec, Ultrafast opto-terahertz photonic crystal modulator, Opt Lett 32 (2007), 680.Р”В§. Averitt, Active terahertz metamaterial devices, NatureР”В¦. Operation of an electrically driven terahertz modulator, Appl PhysР”Тђ. Li, Determination principal component content of Pulsed spectroscopic imaging, Appl Phys Lett 86 (2005), 241116.Р”Р€. Kemp, Detection and identiРїВ¬Рѓcation of explosives using terahertz Buttner, Integrated THz technology for label-free geneticР”Вiagnostics, Appl Phys Lett 80 (2002), 154РІР‚вЂњ156.Р”Сћ. Of the high-resistivity silicon photonic crystal slab, demonstrat-Р”РЋ. Here is based on the modulated semiconductor laser excitation atР”РЋ50-mW average power at 808 nm to illuminate the line defect We experimentally demonstrated that the designed optically controlled THz modulator based on photonic crystal slab are able toР”Р„chieve THz wave modulation. Photonic crystal having short lifetime of photocarriers. Modulation speed is limited by the lifetime of photocarriers.Р”Р‡urther studies will be conducted with another semiconductor Photonic crystal defect is illuminated by the pumping light, photocarriers are induced and the refractive index is changed. The photonic crystal bandgap can be shifted dynamically

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The free carriers are distributed uniformly within the illuminated Photo-induced carriers in silicon is excited. Carrier injection into the silicon photonic crystal isР”Р„chieved using a modulated semiconductor laser at 808 nm with Wave modulator is based on dynamic bandgap shift of the highresistivity silicon photonic crystal by the photo-induced chargeР”В¬arriers. Figure 4(b) shows the detected signal from THz wave pyroelectricР”Вetector with 0.8 Kb/s. With 0.8 Kb/s for laser modulation is shown in Figure 4(a). Measured THz wave transmittanceР”В¬haracteristic of the novel THz wave modulator with the modulated laser is shown in Figure 4. [Color РїВ¬Рѓgure can be viewed in the online issue, which is availableР”Р„t THz wave communication. Research Program of China (2007CB310403), and China Postdoctoral Science Foundation.Р”Р‡igure 3 Photography of the setup for tested terahertz wave modulator. This research was partially supported by the National Natural Science Foundation of China (No.

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