Optical properties and potential applications of ɛ-GaSe at terahertz frequencies

Ching-Wei Chen; Tsung-Ta Tang; Sung-Hui Lin; Jung Y. Huang; Chen-Shiung Chang; Pei-Kang Chung; Shun-Tung Yen; Ci-Ling Pan

doi:10.1364/JOSAB.26.000A58

Journal of the Optical Society of America B
Vol. 26,
Issue 9,
pp. A58-A65
(2009)
•https://doi.org/10.1364/JOSAB.26.000A58

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

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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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Abstract

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 ( $FOM \sim 10^{3}$ at $1 THz$ ), the large birefringence ( $Δ n \sim 0.76$ at $1 THz$ ). and the low absorption coefficient ( $α \sim 0.2 {cm}^{- 1}$ at $1 THz$ ) of GaSe are also identified. Potential applications to practical photonic devices such as phase shifters at THz frequencies are proposed.

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Ordinary			Extraordinary
Parameter	This work	Ref. [1]	Parameter	This work	Ref. [1]
A $({cm}^{6})$	$6.105 \times 10^{- 27}$	$6.105 \times 10^{- 27}$	$A^{'}$ $({cm}^{6})$	$122.3 \times 10^{- 27}$
B $({cm}^{4})$	$1.8564 \times 10^{- 18}$	$1.8564 \times 10^{- 18}$	$B^{'}$ $({cm}^{4})$	$- 22.88 \times 10^{- 18}$
C $({cm}^{2})$	$4.0499 \times 10^{- 9}$	$4.0499 \times 10^{- 9}$	$C^{'}$ $({cm}^{2})$	$3.879 \times 10^{- 9}$
$S_{1}$	7.37	7.443	$S_{3}$	5.76	5.76
$S_{2}$	0.017
$Γ_{1}$ $({cm}^{- 1})$	2.8	3	$Γ_{3}$ $({cm}^{- 1})$	2.8	2.8
$Γ_{2}$ $({cm}^{- 1})$	0.5667
$ω_{L}$ $({cm}^{- 1})$	255	254.7	$ω_{L}$ $({cm}^{- 1})$	245.5	245.5
$ω_{T}$ $({cm}^{- 1})$	213.5	213.5	$ω_{T}$ $({cm}^{- 1})$	237	237
$ω_{t}$ $({cm}^{- 1})$	19.53

Ordinary $(n_{o})$			Extraordinary $(n_{e})$
Parameter	This work	Ref. [22]	Parameter	This work	Ref. [22]
A	7.37	7.443	$A^{'}$	5.76	5.76
B	0.405	0.405	$B^{'}$	0.3879	0.3879
C	0.0186	0.0186	$C^{'}$	$- 0.2288$	$- 0.2288$
D	0.0061	0.0061	$D^{'}$	0.1223	0.1223
E	3.1436	3.1485	$E^{'}$	0.4206	1.855
F	2193.8	2194	$F^{'}$	1780.3	1780
G	0.017
H	262177.5577

Ordinary			Extraordinary
Parameter	This work	Ref. [1]	Parameter	This work	Ref. [1]
A $({cm}^{6})$	$6.105 \times 10^{- 27}$	$6.105 \times 10^{- 27}$	$A^{'}$ $({cm}^{6})$	$122.3 \times 10^{- 27}$
B $({cm}^{4})$	$1.8564 \times 10^{- 18}$	$1.8564 \times 10^{- 18}$	$B^{'}$ $({cm}^{4})$	$- 22.88 \times 10^{- 18}$
C $({cm}^{2})$	$4.0499 \times 10^{- 9}$	$4.0499 \times 10^{- 9}$	$C^{'}$ $({cm}^{2})$	$3.879 \times 10^{- 9}$
$S_{1}$	7.37	7.443	$S_{3}$	5.76	5.76
$S_{2}$	0.017
$Γ_{1}$ $({cm}^{- 1})$	2.8	3	$Γ_{3}$ $({cm}^{- 1})$	2.8	2.8
$Γ_{2}$ $({cm}^{- 1})$	0.5667
$ω_{L}$ $({cm}^{- 1})$	255	254.7	$ω_{L}$ $({cm}^{- 1})$	245.5	245.5
$ω_{T}$ $({cm}^{- 1})$	213.5	213.5	$ω_{T}$ $({cm}^{- 1})$	237	237
$ω_{t}$ $({cm}^{- 1})$	19.53

Ordinary $(n_{o})$			Extraordinary $(n_{e})$
Parameter	This work	Ref. [22]	Parameter	This work	Ref. [22]
A	7.37	7.443	$A^{'}$	5.76	5.76
B	0.405	0.405	$B^{'}$	0.3879	0.3879
C	0.0186	0.0186	$C^{'}$	$- 0.2288$	$- 0.2288$
D	0.0061	0.0061	$D^{'}$	0.1223	0.1223
E	3.1436	3.1485	$E^{'}$	0.4206	1.855
F	2193.8	2194	$F^{'}$	1780.3	1780
G	0.017
H	262177.5577

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