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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 21, Iss. 23 — Nov. 18, 2013
  • pp: 28657–28667

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

Li-Jing Cheng and Lei Liu  »View Author Affiliations

Optics Express, Vol. 21, Issue 23, pp. 28657-28667 (2013)

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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.

© 2013 Optical Society of America

OCIS Codes
(130.1750) Integrated optics : Components
(230.4110) Optical devices : Modulators
(040.2235) Detectors : Far infrared or terahertz
(170.6795) Medical optics and biotechnology : Terahertz imaging

ToC Category:
Terahertz Optics

Original Manuscript: September 30, 2013
Manuscript Accepted: November 5, 2013
Published: November 14, 2013

Virtual Issues
Vol. 9, Iss. 1 Virtual Journal for Biomedical Optics

Li-Jing Cheng and Lei Liu, "Optical modulation of continuous terahertz waves towards cost-effective reconfigurable quasi-optical terahertz components," Opt. Express 21, 28657-28667 (2013)

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