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Applied Optics

Applied Optics

APPLICATIONS-CENTERED RESEARCH IN OPTICS

  • Editor: Joseph N. Mait
  • Vol. 51, Iss. 6 — Feb. 20, 2012
  • pp: 776–779

Narrow bandpass tunable terahertz filter based on photonic crystal cavity

Jinglong He, Pingan Liu, Yalan He, and Zhi Hong  »View Author Affiliations


Applied Optics, Vol. 51, Issue 6, pp. 776-779 (2012)
http://dx.doi.org/10.1364/AO.51.000776


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Abstract

We have fabricated a very narrow bandpass tunable terahertz (THz) filter based on a one-dimensional photonic crystal cavity. Since the filter consists of silicon wafers and air spacers, it has a very high quality factor of about 1500. The full width at half maximum (FWHM) of the passband is only about 200 MHz, and the peak transmission is higher than 4dB. Besides, the central frequency can be tuned rapidly over the entire bandgap with the length of cavity adjusted by a motorized linear stage. Further analytical calculations indicate that a high-Q tunable filter with both high peak transmission and wide tunable range is possible if thinner silicon layers are used.

© 2012 Optical Society of America

OCIS Codes
(120.2230) Instrumentation, measurement, and metrology : Fabry-Perot
(120.2440) Instrumentation, measurement, and metrology : Filters
(230.5298) Optical devices : Photonic crystals
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Spectroscopy

History
Original Manuscript: September 28, 2011
Revised Manuscript: November 29, 2011
Manuscript Accepted: November 30, 2011
Published: February 17, 2012

Citation
Jinglong He, Pingan Liu, Yalan He, and Zhi Hong, "Narrow bandpass tunable terahertz filter based on photonic crystal cavity," Appl. Opt. 51, 776-779 (2012)
http://www.opticsinfobase.org/ao/abstract.cfm?URI=ao-51-6-776

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