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Optical modulation of continuous terahertz waves towards cost-effective reconfigurable quasi-optical terahertz components

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  • We report optical modulation of continuous terahertz (THz) wave in the frequency range of 570-600 GHz using photo-induced reconfigurable patterns on a silicon wafer. The patterns were implemented using programmable illumination from a commercially-available digital light processing (DLP) projector. A modulation depth of 20 dB at 585 GHz has been demonstrated. Modulation speed measurement shows a 3-dB bandwidth of ~1.3 kHz which is primarily limited by the DLP system. A photo-induced polarizer with tunable polarization angle has been demonstrated, showing a 3-dB extinction ratio. Reconfigurable aperture-arrays (4 x 4 pixels) have been attempted for room-temperature coded-aperture imaging using a single Schottky diode detector at 585 GHz. We envision that this technique will provide a simple but powerful means to realize a variety of cost-effective reconfigurable quasi-optical THz circuits and components.
  • This paper was published in Optics Express and is made available as an electronic reprint with the permission of the Optical Society of America. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-21-23-28657. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
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  • Li-Jing Cheng and Lei Liu, "Optical modulation of continuous terahertz waves towards cost-effective reconfigurable quasi-optical terahertz components," Optics Express 21, 28657-28667 (2013). doi:10.1364/OE.21.028657
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  • 21
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  • 23
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  • This work was partiallysupported by NSF Grants ECCS-1002088 and ECCS-1102214. The authors also would like toacknowledge partial supports from the Advanced Diagnostics and Therapeutics (AD&T) andthe Center for Nano Science and Technology (NDnano) at the University of Notre Dame.
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