Journal
OPTICS EXPRESS
Volume 21, Issue 23, Pages 28657-28667Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.21.028657
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Funding
- NSF [ECCS-1002088, ECCS-1102214]
- Advanced Diagnostics and Therapeutics (ADT)
- Center for Nano Science and Technology (NDnano) at the University of Notre Dame
- Directorate For Engineering
- Div Of Electrical, Commun & Cyber Sys [1002088] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1102214] Funding Source: National Science Foundation
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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 similar to 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. (C) 2013 Optical Society of America
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