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Journal of the Optical Society of America B

Journal of the Optical Society of America B


  • Editor: Henry Van Driel
  • Vol. 26, Iss. 9 — Sep. 1, 2009
  • pp: A58–A65

Optical properties and potential applications of ɛ - Ga Se at terahertz frequencies

Ching-Wei Chen, Tsung-Ta Tang, Sung-Hui Lin, Jung Y. Huang, Chen-Shiung Chang, Pei-Kang Chung, Shun-Tung Yen, and Ci-Ling Pan  »View Author Affiliations

JOSA B, Vol. 26, Issue 9, pp. A58-A65 (2009)

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Ordinary and extraordinary refractive indices of an ɛ - Ga Se crystal at terahertz (THz) frequencies are experimentally determined in this study. Fitting experimental data by THz time-domain spectroscopy (THz-TDS) and a Fourier transform infrared spectrometer (FTIR), we proposed revised complex dielectric functions and Sellmeier equations of GaSe for both ordinary and extraordinary waves from 0.2 to 100 THz . Phonon vibrational modes and overtones in the THz frequency range are examined in detail. The high magnitude of the figure of merit ( FOM 10 3 at 1 THz ), the large birefringence ( Δ n 0.76 at 1 THz ). and the low absorption coefficient ( α 0.2 cm 1 at 1 THz ) of GaSe are also identified. Potential applications to practical photonic devices such as phase shifters at THz frequencies are proposed.

© 2009 Optical Society of America

OCIS Codes
(160.4330) Materials : Nonlinear optical materials
(160.4760) Materials : Optical properties
(300.6300) Spectroscopy : Spectroscopy, Fourier transforms
(300.6495) Spectroscopy : Spectroscopy, teraherz

Original Manuscript: February 4, 2009
Manuscript Accepted: May 4, 2009
Published: June 19, 2009

Ching-Wei Chen, Tsung-Ta Tang, Sung-Hui Lin, Jung Y. Huang, Chen-Shiung Chang, Pei-Kang Chung, Shun-Tung Yen, and Ci-Ling Pan, "Optical properties and potential applications of ɛ-GaSe at terahertz frequencies," J. Opt. Soc. Am. B 26, A58-A65 (2009)

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