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Title:
DEVICE AND METHOD FOR MODULATING TRANSMISSION OF TERAHERTZ WAVES
Document Type and Number:
WIPO Patent Application WO/2012/151380
Kind Code:
A3
Abstract:
A device for modulating terahertz waves includes a metal layer (703) including a continuous metal portion (705) and island metal portions (707). The metal portions (705, 707) are separated by apertures (709). The device further includes a semiconductor layer (715) affixed to a bottom surface of the metal layer (703). The semiconductor layer (715) includes carrier regions (717) located below the apertures (709). The transmission of terahertz waves through the apertures (709) is modulated by changing a voltage applied across the aperture via voltage source (715). By injecting free carriers into carrier regions (717) due to a change of the voltage an extraordinary terahertz transmission effect of the metal layer (703) can be switched off. A small increase in the free-carrier absorption is significantly enhanced by the Fabry-Perot resonance, resulting in a substantial decrease in transmission. The disclosed ring aperture terahertz modulator allows for electrical control of the carrier density only in the area underneath the aperture. This design minimizes the power consumption and maximizes the operation speed.

Inventors:
XU, Qianfan (5206 Grape Street, Houston, TX, 77096, US)
SHU, Jie (6100 Main St, Houston, TX, 77005-1827, US)
MITTLEMAN, Daniel, M. (6100 Main St, Houston, TX, 77005-1827, US)
QIU, Ciyuan (6100 Main St, Houston, TX, 77005-1827, US)
Application Number:
US2012/036289
Publication Date:
June 13, 2013
Filing Date:
May 03, 2012
Export Citation:
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Assignee:
WILLIAM MARSH RICE UNIVERSITY (6100 Main Street, Houston, TX, 77005-1892, US)
XU, Qianfan (5206 Grape Street, Houston, TX, 77096, US)
SHU, Jie (6100 Main St, Houston, TX, 77005-1827, US)
MITTLEMAN, Daniel, M. (6100 Main St, Houston, TX, 77005-1827, US)
QIU, Ciyuan (6100 Main St, Houston, TX, 77005-1827, US)
International Classes:
H01Q15/00; G02B1/00; G02F1/015
Other References:
CHEN HOU-TONG ET AL: "Hybrid metamaterials enable fast electrical modulation of freely propagating terahertz waves", APPLIED PHYSICS LETTERS, AIP, AMERICAN INSTITUTE OF PHYSICS, MELVILLE, NY, US, vol. 93, no. 9, 4 September 2008 (2008-09-04), pages 91117-91117, XP012113739, ISSN: 0003-6951, DOI: 10.1063/1.2978071
CHANG YI-TSUNG ET AL: "Surface plasmon on aluminum concentric rings arranged in a long-range periodic structure", APPLIED PHYSICS LETTERS, AIP, AMERICAN INSTITUTE OF PHYSICS, MELVILLE, NY, US, vol. 92, no. 25, 25 June 2008 (2008-06-25) , pages 253111-253111, XP012107710, ISSN: 0003-6951, DOI: 10.1063/1.2949743
SHU JIE ET AL: "High-contrast terahertz modulator based on extraordinary transmission through a ring aperture", OPTICS EXPRESS, vol. 19, no. 27, 19 December 2011 (2011-12-19), pages 26666-26671, XP055058716, ISSN: 1094-4087, DOI: 10.1364/OE.19.026666
CHAN WAI LAM ET AL: "Single-pixel terahertz camera speeds measurement", LASER FOCUS WORLD, PENNWELL, TULSA, OK, US, vol. 44, no. 9, 1 September 2008 (2008-09-01), pages 73-75, XP001537475,
SHU JIE ET AL: "Resonant Transmission of Ring Aperture for Switching Terahertz Waves", CONFERENCE ON LASERS AND ELECTRO-OPTICS (CLEO) 2011, CLEO: SCIENCE AND INNOVATIONS, BALTIMORE, MD, USA, 1-6 MAY 2011, 1 May 2011 (2011-05-01), - 6 May 2011 (2011-05-06), pages 1-2, XP008161398, DOI: 10.1364/CLEO_SI.2011.CWA3
POUJET Y ET AL: "90% EXTRAORDINARY OPTICAL TRANSMISSION IN THE VISIBLE RANGE THROUGH ANNULAR APERTURE METALLIC ARRAYS", OPTICS LETTERS, OSA, OPTICAL SOCIETY OF AMERICA, WASHINGTON, DC, US, vol. 32, no. 20, 15 October 2007 (2007-10-15), pages 2942-2944, XP001508534, ISSN: 0146-9592, DOI: 10.1364/OL.32.002942
XU QIANFUN ET AL: "Micrometre-scale silicon electro-optic modulator", NATURE: INTERNATIONAL WEEKLY JOURNAL OF SCIENCE, NATURE PUBLISHING GROUP, UNITED KINGDOM, vol. 435, no. 7040, 19 May 2005 (2005-05-19), pages 325-327, XP002515460, ISSN: 0028-0836, DOI: 10.1038/NATURE03569
Attorney, Agent or Firm:
DOSSA, Aly, Z. et al. (Osha ⋅ Liang LLP, 909 Fannin Street Suite 350, Houston TX, 77010, US)
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