Measuring material parameters using a tunable monochromatic terahertz wave source

Yoshio Wada; Yoshiharu Urata; Hiroshi Ito; Yasuhiro Higashi

doi:10.1364/AO.406019

Applied Optics
Vol. 59,
Issue 32,
pp. 10035-10042
(2020)
•https://doi.org/10.1364/AO.406019

Measuring material parameters using a tunable monochromatic terahertz wave source

Yoshio Wada, Yoshiharu Urata, Hiroshi Ito, and Yasuhiro Higashi

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Yoshio Wada, Yoshiharu Urata, Hiroshi Ito, and Yasuhiro Higashi, "Measuring material parameters using a tunable monochromatic terahertz wave source," Appl. Opt. 59, 10035-10042 (2020)

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- Terahertz and X-ray Optics
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About this Article
History
- Original Manuscript: August 21, 2020
- Revised Manuscript: October 14, 2020
- Manuscript Accepted: October 14, 2020
- Published: November 5, 2020

Abstract

We measured complex refractive indices of materials that transmitted well in the terahertz (THz) range using a tunable, monochromatic pulsed THz wave source and a high-sensitivity semiconductor detector. This approach is based on simple monochromatic transmission power measurements. Contrast enhancement by refractive index cladding was employed to measure the complex refractive indices. The experimental results were in good agreement with previously reported values. These results suggested that our approach could be used to quickly analyze material properties, such as surface roughness, and to determine the complex refractive indices of liquids or gases. In addition, as an application of the findings obtained here, we applied an anti-reflection polymer film to the silicon prism that served as an output coupler of the THz wave source. The film reduced surface reflection by 25%.

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	$n$ (measured)	$κ$ (measured)	$n$ (reference)	$κ$ (reference)	Reference
PET	$1.31 \pm 0.04$	$0.040 \pm 0.003$	1.71, 1.75	0.04775	[21,22]
POM	$1.41 \pm 0.03$	$0.018 \pm 0.002$	1.66	0.015	[10]
PTFE	$1.416 \pm 0.016$	$0.0016 \pm 0.0015$	1.43, 1.45, 1.445	0.002	[10,20,21]
PEEK	$1.60 \pm 0.02$	$0.020 \pm 0.002$	1.58, 1.76	0.03581, 0.02865	[18,19]
PC	$1.42 \pm 0.02$	$0.020 \pm 0.002$	1.65, 1.64, 1.651	0.025	[10,20,21]
PMMA	$1.41 \pm 0.03$	$0.024 \pm 0.002$	1.62, 1.6, 1.596	0.03	[10,20,21]
PE	$1.485 \pm 0.01$	$0.0015 \pm 0.001$	1,52, 1.6, 1.534	0.00549,	[10,20,21]
96% ${A l}_{2} O_{3}$	$3.045 \pm 0.014$	$0.0068 \pm 0.003$	3., 3.07	0.0072	[12,23]
HR-FZ Si	$3.405 \pm 0.006$	$0.00065 \pm 0.00135$	3.416, 3.417	0.00004	[11]

	$n$ (measured)	$κ$ (measured)	$n$ (reference)	$κ$ (reference)	Reference
PET	$1.72 \pm 0.03$	$0.052 \pm 0.004$	1.71, 1.75	0.04775	[21,22]
POM	$1.65 \pm 0.04$	$0.032 \pm 0.004$	1.66	0.015	[10]
PTFE	$1.46 \pm 0.03$	$0.0136 \pm 0.0044$	1.43, 1.45, 1.445	0.002	[10,20,21]
PEEK	$1.78 \pm 0.04$	$0.042 \pm 0.003$	1.58, 1.76	0.03581, 0.02865	[18,19]
PC	$1.66 \pm 0.03$	$0.034 \pm 0.003$	1.65, 1.64, 1.651	0.025	[10,20,21]
PMMA	$1.61 \pm 0.05$	$0.040 \pm 0.004$	1.62, 1.6, 1.596	0.03	[10,20,21]
PE	$1.54 \pm 0.03$	$0.014 \pm 0.0044$	1,52, 1.6, 1.534	0.00549, 0.02865	[10,20,21]

	$n$ (measured)	$κ$ (measured)	$n$ (reference)	$κ$ (reference)	Reference
PET	$1.31 \pm 0.04$	$0.040 \pm 0.003$	1.71, 1.75	0.04775	[21,22]
POM	$1.41 \pm 0.03$	$0.018 \pm 0.002$	1.66	0.015	[10]
PTFE	$1.416 \pm 0.016$	$0.0016 \pm 0.0015$	1.43, 1.45, 1.445	0.002	[10,20,21]
PEEK	$1.60 \pm 0.02$	$0.020 \pm 0.002$	1.58, 1.76	0.03581, 0.02865	[18,19]
PC	$1.42 \pm 0.02$	$0.020 \pm 0.002$	1.65, 1.64, 1.651	0.025	[10,20,21]
PMMA	$1.41 \pm 0.03$	$0.024 \pm 0.002$	1.62, 1.6, 1.596	0.03	[10,20,21]
PE	$1.485 \pm 0.01$	$0.0015 \pm 0.001$	1,52, 1.6, 1.534	0.00549,	[10,20,21]
96% ${A l}_{2} O_{3}$	$3.045 \pm 0.014$	$0.0068 \pm 0.003$	3., 3.07	0.0072	[12,23]
HR-FZ Si	$3.405 \pm 0.006$	$0.00065 \pm 0.00135$	3.416, 3.417	0.00004	[11]

	$n$ (measured)	$κ$ (measured)	$n$ (reference)	$κ$ (reference)	Reference
PET	$1.72 \pm 0.03$	$0.052 \pm 0.004$	1.71, 1.75	0.04775	[21,22]
POM	$1.65 \pm 0.04$	$0.032 \pm 0.004$	1.66	0.015	[10]
PTFE	$1.46 \pm 0.03$	$0.0136 \pm 0.0044$	1.43, 1.45, 1.445	0.002	[10,20,21]
PEEK	$1.78 \pm 0.04$	$0.042 \pm 0.003$	1.58, 1.76	0.03581, 0.02865	[18,19]
PC	$1.66 \pm 0.03$	$0.034 \pm 0.003$	1.65, 1.64, 1.651	0.025	[10,20,21]
PMMA	$1.61 \pm 0.05$	$0.040 \pm 0.004$	1.62, 1.6, 1.596	0.03	[10,20,21]
PE	$1.54 \pm 0.03$	$0.014 \pm 0.0044$	1,52, 1.6, 1.534	0.00549, 0.02865	[10,20,21]

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Equations (10)

Applied Optics