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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 14 — Jul. 9, 2007
  • pp: 8898–8912

Fast one-dimensional photonic crystal modulators for the terahertz range

L. Fekete, F. Kadlec, H. Němec, and P. Kužel  »View Author Affiliations

Optics Express, Vol. 15, Issue 14, pp. 8898-8912 (2007)

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Optically controlled one-dimensional photonic crystal structures for the THz range are studied both theoretically and experimentally. A GaAs:Cr layer constitutes a defect in the photonic crystals studied; its photoexcitation by 800 nm optical femtosecond pulses leads to the modulation of the THz beam. Since the THz field can be localized in the photoexcited layer of the photonic crystal, the interaction between photocarriers and THz light is strengthened and yields an appreciable modulation of the THz output beam even for low optical pump fluences. Optimum resonant structures are found, constructed and experimentally studied. The dynamical response of these elements is shown to be controlled by the lifetime of THz photons in the resonator and by the free carrier lifetime. The time response of the structures studied is shorter than 330 ps.

© 2007 Optical Society of America

OCIS Codes
(160.5140) Materials : Photoconductive materials
(230.1150) Optical devices : All-optical devices
(230.4110) Optical devices : Modulators
(300.6270) Spectroscopy : Spectroscopy, far infrared

ToC Category:
Photonic Crystals

Original Manuscript: May 7, 2007
Revised Manuscript: June 19, 2007
Manuscript Accepted: June 19, 2007
Published: July 3, 2007

L Fekete, F. Kadlec, H Nemec, and P. Kužel, "Fast one-dimensional photonic crystal modulators for the terahertz range," Opt. Express 15, 8898-8912 (2007)

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