Narrowband metamaterial absorbers based on interlaced T-shaped all-dielectric resonators for sensing application

Yi Fan; Rongcao Yang; Rongcao Yang; Zhaohua Li; Yijia Zhao; Jinping Tian; Wenmei Zhang

doi:10.1364/JOSAB.470475

Journal of the Optical Society of America B
Vol. 39,
Issue 10,
pp. 2863-2869
(2022)
•https://doi.org/10.1364/JOSAB.470475

Narrowband metamaterial absorbers based on interlaced T-shaped all-dielectric resonators for sensing application

Yi Fan, Rongcao Yang, Zhaohua Li, Yijia Zhao, Jinping Tian, and Wenmei Zhang

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Yi Fan, Rongcao Yang, Zhaohua Li, Yijia Zhao, Jinping Tian, and Wenmei Zhang, "Narrowband metamaterial absorbers based on interlaced T-shaped all-dielectric resonators for sensing application," J. Opt. Soc. Am. B 39, 2863-2869 (2022)

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Table of Contents Category
- Materials and Metamaterials
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About this Article
History
- Original Manuscript: July 13, 2022
- Revised Manuscript: September 12, 2022
- Manuscript Accepted: September 14, 2022
- Published: September 29, 2022

Abstract

In this paper, a narrowband metamaterial absorber and its complementary structure absorber are proposed, which can be used for refractive index sensing in the terahertz (THz) band. The proposed two absorbers are composed of complementary rotating interlaced T-shaped all-dielectric resonators located on gold plates. It is demonstrated that the interlaced T-shaped absorber has a narrow single absorption peak with absorptivity of 99.4% at 2.987 THz; its full width at half maximum (FWHM) is 0.0219 THz, and the relative bandwidth is 0.73%. The complementary absorber has two narrow absorption peaks at 3.171 THz and 3.409 THz with absorptivity of 99.3% and 99.8%, corresponding FWHMs of 0.0133 THz and 0.0074 THz, and relative bandwidths of 0.42% and 0.22%, respectively. Based on the narrowband absorption characteristics of the absorbers, the sensing applications for different refractive indices of analyte layers are studied. The sensing sensitivity of the two absorbers can reach 1030 GHz/RIU and 3190 GHz/RIU, respectively. The proposed absorbers are promising in the fields of electromagnetic detection, imaging, and sensing.

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Data underlying the results presented in this paper are not publicly available at this time but may be obtained from the authors upon reasonable request.

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References	Absorption Frequency (THz)	Absorptivity	FWHM (GHz)	$Q$ -Factor
[35]	1.731	96.40%	29.0	60.10
[36]	1.800	99.80%	15.0	120.00
[36]	2.260	99.60%	24.0	94.00
[37]	0.500	99.20%	16.0	31.00
[38]	8.440	99.00%	100.0	84.40
[39]	1.563	99.95%	43.0	36.35
Structure I	2.987	99.40%	23.4	136.40
Structure II	3.171	99.30%	13.3	238.40
	3.409	99.80%	7.4	460.70

Analyte Layers	$f_{1}$ (THz)	$S_{1}$ (GHz/RIU)
$n = 1.0$	2.987	–
$n = 1.1$	2.884	1030.00
$n = 1.2$	2.840	735.00
$n = 1.3$	2.800	623.33
$n = 1.4$	2.760	567.50
$n = 1.5$	2.726	522.00
$n = 1.6$	2.691	493.33

Analyte Layers	$f_{21}$ (THz)	$f_{22}$ (THz)	$S_{1}$ (GHz/RIU)	$S_{2}$ (GHz/RIU)
1.0	3.171	3.409	–	–
$n = 1.1$	2.852	3.093	3190.00	3160.00
$n = 1.2$	2.802	3.079	1845.00	1650.00
$n = 1.3$	2.757	3.062	1380.00	1156.67
$n = 1.4$	2.715	3.044	1140.00	912.50
$n = 1.5$	2.677	3.024	988.00	770.00
$n = 1.6$	2.638	3.001	888.33	680.00

References	Absorption Frequency (THz)	Absorptivity	FWHM (GHz)	$Q$ -Factor
[35]	1.731	96.40%	29.0	60.10
[36]	1.800	99.80%	15.0	120.00
[36]	2.260	99.60%	24.0	94.00
[37]	0.500	99.20%	16.0	31.00
[38]	8.440	99.00%	100.0	84.40
[39]	1.563	99.95%	43.0	36.35
Structure I	2.987	99.40%	23.4	136.40
Structure II	3.171	99.30%	13.3	238.40
	3.409	99.80%	7.4	460.70

Analyte Layers	$f_{1}$ (THz)	$S_{1}$ (GHz/RIU)
$n = 1.0$	2.987	–
$n = 1.1$	2.884	1030.00
$n = 1.2$	2.840	735.00
$n = 1.3$	2.800	623.33
$n = 1.4$	2.760	567.50
$n = 1.5$	2.726	522.00
$n = 1.6$	2.691	493.33

Abstract

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Figures (7)

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Equations (2)

Journal of the Optical Society of America B