Design of a highly sensitive terahertz temperature and refractive index composite sensor based on an InSb&#x2013;Ag composite grating

Chunli Zhang; Chunli Zhang; Chunli Zhang; Chunli Zhang; Yanfei Liu; Yanfei Liu; Yanfei Liu; Yanfei Liu; Jing Li; Jing Li; Jing Li; Jing Li; Qiannan Wu; Qiannan Wu; Qiannan Wu; Qiannan Wu; Mengwei Li; Mengwei Li; Mengwei Li; Mengwei Li; Mengwei Li

doi:10.1364/JOSAB.507065

Journal of the Optical Society of America B
Vol. 41,
Issue 2,
pp. 411-420
(2024)
•https://doi.org/10.1364/JOSAB.507065

Design of a highly sensitive terahertz temperature and refractive index composite sensor based on an InSb–Ag composite grating

Chunli Zhang, Yanfei Liu, Jing Li, Qiannan Wu, and Mengwei Li

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Chunli Zhang, Yanfei Liu, Jing Li, Qiannan Wu, and Mengwei Li, "Design of a highly sensitive terahertz temperature and refractive index composite sensor based on an InSb–Ag composite grating," J. Opt. Soc. Am. B 41, 411-420 (2024)

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Abstract

This paper introduces an exceptionally highly sensitive sensor developed using InSb–Ag composite gratings for sensing temperature and refractive index in the terahertz region. The structural parameters of the sensor were optimized to produce two transmission spectra at frequencies of 2.016 THz and 10.428 THz, respectively, under $T = {290}\;{\rm K}$ with transverse magnetically polarized vertical incidence. The simulation results demonstrate that the temperature sensor displays a sensitivity of 25.27 GHz/K and 4.53 GHz/K; the respective refractive index sensor shows a sensitivity of 0.48 THz/RIU and 3.60 THz/RIU. The current paper analyzes the effects of incidence and polarization angles on the performance of the sensors. The findings indicate that polarization significantly correlates with the sensor. Regarding the incidence angle range of 0°–30°, the performance of the sensors is uncorrelated with the angle of incidence. Compared to other temperature and refractive index sensors, the composite grating sensor demonstrates superior sensing performance and holds great potential for developing high-performance dual-function sensors.

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The data that support the findings of this study are available from the corresponding author upon reasonable request.

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								Temperature Sensitivity (GHz/K)		RI Sensitivity (THz/RIU)
Reference	Structure	Operating Frequency (THz)	Sensor Size (µm)	Temperature Range (K)	RI Range	Incident Angle Insensitive	Polarization Angle Insensitive	Peak 1	Peak 2	Peak 1	Peak 2
[41]	InSb microcolumn array	0–2	$150 \times 150 \times 139$	295–320	1.00–1.05	–	–	2.13	–	0.96	–
[42]	All InSb resonator	1.8–2.1	$150 \times 150 \times 160$	290–300	1.00–1.05	–	–	5.5	7.5	1.8	1.9
[21]	All-dielectric InSb resonator	1.1–1.6	$120 \times 120 \times 240$	295–320	1.00–1.05	No	Yes	5.9	6.4	1.3	1.0
[26]	Asymmetric grating	157.9–187.5	$1.0 \times 1.0 \times 2.35$	295.15–320.15	1.33–1.34	–	–	4	8	10	30
[25]	GMR-TPS	375–441	$0.56 \times 0.3 \times 0.25$	293.05–333.05	1.32–1.40	–	–	25	–	111	–
This work	InSb–Ag composite grating	0–12	$9.7 \times 5 \times 11$	270–320	1.00–1.05	Yes (0–30^°)	No	25.27	4.53	0.48	3.60

								Temperature Sensitivity (GHz/K)		RI Sensitivity (THz/RIU)
Reference	Structure	Operating Frequency (THz)	Sensor Size (µm)	Temperature Range (K)	RI Range	Incident Angle Insensitive	Polarization Angle Insensitive	Peak 1	Peak 2	Peak 1	Peak 2
[41]	InSb microcolumn array	0–2	$150 \times 150 \times 139$	295–320	1.00–1.05	–	–	2.13	–	0.96	–
[42]	All InSb resonator	1.8–2.1	$150 \times 150 \times 160$	290–300	1.00–1.05	–	–	5.5	7.5	1.8	1.9
[21]	All-dielectric InSb resonator	1.1–1.6	$120 \times 120 \times 240$	295–320	1.00–1.05	No	Yes	5.9	6.4	1.3	1.0
[26]	Asymmetric grating	157.9–187.5	$1.0 \times 1.0 \times 2.35$	295.15–320.15	1.33–1.34	–	–	4	8	10	30
[25]	GMR-TPS	375–441	$0.56 \times 0.3 \times 0.25$	293.05–333.05	1.32–1.40	–	–	25	–	111	–
This work	InSb–Ag composite grating	0–12	$9.7 \times 5 \times 11$	270–320	1.00–1.05	Yes (0–30^°)	No	25.27	4.53	0.48	3.60

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Journal of the Optical Society of America B