Tunable plasmon refractive index sensor and slow light characteristics based on a stub coupled with an ellipse resonator and its derived structure

Yunping Qi; Haowen Chen; Shiyu Zhao; Yujiao Wen; Xiangxian Wang

doi:10.1364/JOSAB.471889

Journal of the Optical Society of America B
Vol. 39,
Issue 11,
pp. 2957-2968
(2022)
•https://doi.org/10.1364/JOSAB.471889

Tunable plasmon refractive index sensor and slow light characteristics based on a stub coupled with an ellipse resonator and its derived structure

Yunping Qi, Haowen Chen, Shiyu Zhao, Yujiao Wen, and Xiangxian Wang

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Yunping Qi, Haowen Chen, Shiyu Zhao, Yujiao Wen, and Xiangxian Wang, "Tunable plasmon refractive index sensor and slow light characteristics based on a stub coupled with an ellipse resonator and its derived structure," J. Opt. Soc. Am. B 39, 2957-2968 (2022)

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Table of Contents Category
- Wave Guiding and Confinement
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About this Article
History
- Original Manuscript: August 2, 2022
- Revised Manuscript: September 14, 2022
- Manuscript Accepted: September 28, 2022
- Published: October 19, 2022

Abstract

In this paper, a structure consisting of a stub metal-insulator-metal (MIM) waveguide coupled with an ellipse resonator is proposed. The finite element method (FEM) is used to analyze the transmission characteristics and magnetic field distributions of the structure in detail. The basic structure can support triple Fano resonances. In addition, multi-spectrum characteristics can be achieved by increasing the complexity of the structure. All Fano resonances can be tuned by altering the geometric parameters of the structure. Furthermore, each of the proposed structures has applications in both sensing and slow light devices. The maximum sensitivity of refractive index sensing is up to 1400 nm/RIU. The MIM waveguide structures have potential applications in the field of on-chip optical integration.

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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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Structure	(1)		(2)		(3)		(4)
Fano	S	${F O M}^{*}$	S	${F O M}^{*}$	S	${F O M}^{*}$	S	${F O M}^{*}$
FR1	650	159.3	700	138.5	700	160.2	700	139
FR2	900	136.1	850	128.9	900	137.7	850	130.7
FR3	1300	189.6	1400	188.1	1350	189.6	1400	188.2
NFR1	–	–	600	145.5	–	–	600	147.8
NFR2	–	–	1100	107.4	–	–	1100	126.6
NFR3	–	–	–	–	700	140.4	700	139.2
NFR4	–	–	–	–	1100	90	1100	126.6

Reference	Year	Sensitivity (nm/RIU)	${F O M}^{*}$	Number of Resonance Modes
Chen et al. [10]	2019	1100	91	2
Butt et al. [49]	2019	1367	25	1
Yang et al. [32]	2020	1420	76.76	2
Chen et al. [9]	2021	1180	42.67	3
Ding et al. [44]	2021	1200	191.6	3
This paper	2022	1400	189.6	6

Chart		Wavelength Range
Phase ( $π$ ) Delay time (ps) Group index	(a)	677–681 nm			883–888 nm			1298–1324 nm				1529–1585 nm
		$0.050 π$	0.055 ps		$0.036 π$	0.063 ps			$0.039 π$	0.127 ps			$0.108 π$		0.083 ps
			8.24			9.50				19.08				12.37
	(b)	635–637 nm		691–694 nm		857–861 nm		1087–1092 nm		1317–1331 nm		1524–1576 nm
		$0.038 π$	0.049 ps	$0.038 π$	0.052 ps	$0.035 π$	0.060 ps	$0.026 π$	0.058 ps	$0.075 π$	0.126 ps		$0.109 π$		0.085 ps
			7.31		7.76		8.97		8.64		18.93				12.75
	(c)	678–681 nm		722–726 nm		883–887 nm		1064–1070 nm		1298–1313 nm			1529–1581 nm
		$0.050 π$	0.064 ps	$0.040 π$	0.049 ps	$0.038 π$	0.064 ps	$0.020 π$	0.039 ps	$0.082 π$	0.128 ps		$0.108 π$		0.082 ps
			9.53		7.83		9.68		5.89		19.21			12.25
	(d)	635–637 nm		691–694 nm		740–744 nm		857–861 nm		1087–1096 nm		1317–1330 nm		1525–1576 nm
		$0.170 π$	0.047 ps	$0.039 π$	0.057 ps	$0.041 π$	0.056 ps	$0.035 π$	0.061 ps	$0.035 π$	0.049 ps	$0.075 π$	0.128	$0.109 π$	0.084 ps
			7.02		8.52		8.35		9.11		7.04		19.10		12.52

Structure	(1)		(2)		(3)		(4)
Fano	S	${F O M}^{*}$	S	${F O M}^{*}$	S	${F O M}^{*}$	S	${F O M}^{*}$
FR1	650	159.3	700	138.5	700	160.2	700	139
FR2	900	136.1	850	128.9	900	137.7	850	130.7
FR3	1300	189.6	1400	188.1	1350	189.6	1400	188.2
NFR1	–	–	600	145.5	–	–	600	147.8
NFR2	–	–	1100	107.4	–	–	1100	126.6
NFR3	–	–	–	–	700	140.4	700	139.2
NFR4	–	–	–	–	1100	90	1100	126.6

Reference	Year	Sensitivity (nm/RIU)	${F O M}^{*}$	Number of Resonance Modes
Chen et al. [10]	2019	1100	91	2
Butt et al. [49]	2019	1367	25	1
Yang et al. [32]	2020	1420	76.76	2
Chen et al. [9]	2021	1180	42.67	3
Ding et al. [44]	2021	1200	191.6	3
This paper	2022	1400	189.6	6

Abstract

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Tables (3)

Equations (15)

Journal of the Optical Society of America B