GST plasmonic gap structure investigation as a switch and sensor

Arya Zareizadeh; Najmeh Nozhat

doi:10.1364/AO.497742

Applied Optics
Vol. 62,
Issue 23,
pp. 6156-6162
(2023)
•https://doi.org/10.1364/AO.497742

GST plasmonic gap structure investigation as a switch and sensor

Arya Zareizadeh and Najmeh Nozhat

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Arya Zareizadeh and Najmeh Nozhat, "GST plasmonic gap structure investigation as a switch and sensor," Appl. Opt. 62, 6156-6162 (2023)

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Table of Contents Category
- Surface Optics and Plasmonics
Optics & Photonics Topics
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The topics in this list come from the Optics and Photonics Topics applied to this article.

About this Article
History
- Original Manuscript: June 9, 2023
- Revised Manuscript: July 23, 2023
- Manuscript Accepted: July 24, 2023
- Published: August 2, 2023

Abstract

In this paper, a plasmonic perfect absorber that consists of a gold rectangular bar with three gaps is investigated as a switch and sensor in the near-infrared region. Phase change material germanium–antimony–tellurium (GST) is utilized in two gaps to perform the switching capability with a high extinction ratio of 18.49 dB. In addition, the sensing performance of the structure for detection of a solution of glucose in water and diagnosis of different cancer cells is studied. The best sensitivity of 1504 nm/RIU is obtained for detection of the PC12 cancer cell, and the figure of merit of the structure is around ${{17}}\;{{\rm{RIU}}^{- 1}}$.

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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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Parameter	Value (nm)	Parameter	Value (nm)
$P_{x}$	310	$W_{m}$	130
$P_{y}$	739	$W_{c}$	70
$W_{1}$	5	$t_{m}$	120
$W_{2}$	40	$t_{c}$	120
$W_{3}$	250	$t_{s}$	60
$W_{g}$	9

$t_{a}$ (nm)	$S_{n}$ (nm/RIU)	FOM ( ${R I U}^{- 1}$ )
140	1388	23.36
180	1425	23.99
220	1453	24.46
260	1458	24.54
300	1467	24.70
340	1448	24.38
380	1444	24.30

Test Medium		Refractive Index	Wavelength (nm)	$S_{n}$ (nm/RIU)	FOM ( ${R I U}^{- 1}$ )	SNR
Cancer cell	Cell 1	$n_{I} = 1.343$	$λ_{1} = 1971.28$	1443	16.97	0.44
	Cell 1	$n_{Y} = 1.369$	$λ_{2} = 2008.80$	1443	16.97	0.44
	Cell 2	$n_{I} = 1.344$	$λ_{1} = 1972.84$	1432	16.80	0.45
	Cell 2	$n_{Y} = 1.371$	$λ_{2} = 2011.49$	1432	16.80	0.45
	Cell 3	$n_{I} = 1.345$	$λ_{1} = 1973.88$	1453	17.01	0.46
	Cell 3	$n_{Y} = 1.372$	$λ_{2} = 2013.11$	1453	17.01	0.46
	Cell 4	$n_{I} = 1.348$	$λ_{1} = 1978.05$	1452	16.87	0.49
	Cell 4	$n_{Y} = 1.377$	$λ_{2} = 2020.17$	1452	16.87	0.49
	Cell 5	$n_{I} = 1.351$	$λ_{1} = 1982.75$	1467	16.91	0.46
	Cell 5	$n_{Y} = 1.378$	$λ_{2} = 2022.35$	1467	16.91	0.46
HeLa		$n_{1} = 1.37$	$λ_{1} = 2010.15$	1481	16.32	0.36
HeLa		$n_{2} = 1.392$	$λ_{2} = 2042.74$	1481	16.32	0.36
PC12		$n_{1} = 1.37$	$λ_{1} = 2010.15$	1504	16.57	0.41
PC12		$n_{2} = 1.395$	$λ_{2} = 2047.76$	1504	16.57	0.41
MDA-MB-231		$n_{1} = 1.37$	$λ_{1} = 2010.15$	1490	16.42	0.48
MDA-MB-231		$n_{2} = 1.399$	$λ_{2} = 2053.37$	1490	16.42	0.48
MCF-7		$n_{1} = 1.37$	$λ_{1} = 2010.15$	1485	16.36	0.50
MCF-7		$n_{2} = 1.401$	$λ_{2} = 2056.19$	1485	16.36	0.50
Jurkat		$n_{1} = 1.37$	$λ_{1} = 2010.15$	1491	16.43	0.33
Jurkat		$n_{2} = 1.390$	$λ_{2} = 2039.96$	1491	16.43	0.33
5% solution of glucose in water		$n_{w} = 1.3330$	$λ_{1} = 1956.87$	1447	17.46	0.12
5% solution of glucose in water		$n_{s} = 1.3401$	$λ_{2} = 1967.14$	1447	17.46	0.12
10% solution of glucose in water		$n_{w} = 1.3330$	$λ_{1} = 1956.87$	1414	17.06	0.25
10% solution of glucose in water		$n_{s} = 1.3476$	$λ_{2} = 1977.52$	1414	17.06	0.25
15% solution of glucose in water		$n_{w} = 1.3330$	$λ_{1} = 1956.87$	1425	17.19	0.39
15% solution of glucose in water		$n_{s} = 1.3556$	$λ_{2} = 1989.07$	1425	17.19	0.39
20% solution of glucose in water		$n_{w} = 1.3330$	$λ_{1} = 1956.87$	1445	17.43	0.54
20% solution of glucose in water		$n_{s} = 1.3641$	$λ_{2} = 2001.82$	1445	17.43	0.54

Parameter	Value (nm)	Tolerance (nm)	Switching Error (%)	Sensing Error (%)
$P_{x}$	310	$\pm 16$	0.059	—
$P_{y}$	739	$\pm 37$	0.361	—
$W_{1}$	5	$\pm 2$	0.180	—
$W_{2}$	40	$\pm 3$	0.264	—
$W_{m}$	130	$\pm 7$	0.224	—
$t_{s}$	60	$\pm 4$	0.577	—
$t_{c}$	120	$\pm 6$	—	4.190
$W_{g}$	9	$\pm 1$	—	4.052
$W_{c}$	70	$\pm 4$	—	0.968

Parameter	Value (nm)	Parameter	Value (nm)
$P_{x}$	310	$W_{m}$	130
$P_{y}$	739	$W_{c}$	70
$W_{1}$	5	$t_{m}$	120
$W_{2}$	40	$t_{c}$	120
$W_{3}$	250	$t_{s}$	60
$W_{g}$	9

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Applied Optics