Asymmetric core-guided polarization-dependent plasmonic biosensor

Firoz Haider; Md. Mashrafi; Rakib Haider; Rifat Ahmmed Aoni; Rajib Ahmed; Rajib Ahmed

doi:10.1364/AO.400301

Applied Optics
Vol. 59,
Issue 26,
pp. 7829-7835
(2020)
•https://doi.org/10.1364/AO.400301

Asymmetric core-guided polarization-dependent plasmonic biosensor

Firoz Haider, Md. Mashrafi, Rakib Haider, Rifat Ahmmed Aoni, and Rajib Ahmed

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Firoz Haider, Md. Mashrafi, Rakib Haider, Rifat Ahmmed Aoni, and Rajib Ahmed, "Asymmetric core-guided polarization-dependent plasmonic biosensor," Appl. Opt. 59, 7829-7835 (2020)

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Abstract

A modified solid-core photonic crystal fiber (PCF)-based plasmonic sensor is proposed where light propagation through the PCF is controlled by scaling down of air holes. The modified core facilitates the easy excitation of the plasmonic surface, resulting in improved sensor performance. The chemically stable gold is externally coated on the PCF surface, which helps to establish surface plasmon resonance phenomena. The response of the sensor is analyzed based on the numerical method, and the design parameters are optimized to enhance the sensing performance. The asymmetric fiber-core structure provides the polarization controllability and significantly suppresses the $y$-polarized response to achieve a dominant $x$-polarized response and additional functionalities. The sensor exhibits a maximum wavelength sensitivity of 11,000 nm/RIU (refractive index unit) and sensing resolution of ${9.09} \times {{10}^{- 6}}$ RIU in the $x$-polarized mode. Also, the sensor exhibits maximum amplitude sensitivity of ${631}\;{{\rm RIU}^{- 1}}$, and a good figure of merit is ${157}\;{{\rm RIU}^{- 1}}$. Furthermore, the sensor can detect the unknown analytes’ refractive index (RI) in the sensing analyte RI range of 1.33 to 1.40, which will lead to finding the potential applications in biomolecules, organic chemicals, and environment monitoring.

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Analyte RI	Peak Loss (dB/cm)	Res. Peak Wave. (nm)	Res. peak Shift(nm)	Wavelength sensitivity (nm/RIU)	Wavelength resolution (RIU)	FWHM	Amp. sens. ( ${R I U}^{- 1}$ )	FOM
1.33	12	610	20	2000	$5 \times 10^{- 5}$	47	152	43
1.34	14	630	20	2000	$5 \times 10^{- 5}$	49	200	41
1.35	18	650	20	2000	$5 \times 10^{- 5}$	52	269	39
1.36	23	670	50	5000	$2 \times 10^{- 5}$	56	471	89
1.37	42	720	40	4000	$2.5 \times 10^{- 5}$	52	361	77
1.38	46	760	70	7000	$1.43 \times 10^{- 5}$	63	540	111
1.39	77	830	110	11,000	$9.09 \times 10^{- 6}$	70	631	157
1.40	190	940	N/A	N/A	N/A	54	N/A	N/A

Ref.	Structure Type	Polarization	Sensing Range	Wave sens. (nm/RIU)	Wave. Res. (RIU)	Amp. Sens. ( ${R I U}^{- 1}$ )	FOM
[7]	Birefringent PCF-based SPR sensor	$x$ -pol.	1.00–1.43	6300	$1.58 \times 10^{- 5}$	N/A	N/A
[37]	D-shaped hollow-core sensor	$y$ -pol.	1.33–1.34	2900	N/A	120	N/A
[19]	Graphene-based PCF SPR sensor	$x$ -pol.	1.33–1.37	5000	$2 \times 10^{- 5}$	860	N/A
[38]	D-shaped low-RI SPR sensor	$y$ -pol.	1.20–1.29	11,055	$9.05 \times 10^{- 6}$	N/A	N/A
[39]	Hollow-core-based SPR sensor	$x$ -pol.	1.27–1.45	5653	N/A	590	N/A
[40]	D-shaped plasmonic sensor	$x$ -pol.	1.33–1.38	10,493	$9.53 \times 10^{- 6}$	N/A	N/A
[41]	Graphene-based PCF sensor	$x$ -pol.	1.33–1.35	2520	$3.97 \times 10^{- 5}$	72.5	N/A
[42]	Grating-based PCF SPR sensor	$x$ -pol.	1.33–1.36	10,600	$9.43 \times 10^{- 6}$	633	N/A
This work	Asymmetric-core based biosensor	$x$ -pol	1.33–1.40	11,000	$9.09 \times 10^{- 6}$	631	157

Analyte RI	Peak Loss (dB/cm)	Res. Peak Wave. (nm)	Res. peak Shift(nm)	Wavelength sensitivity (nm/RIU)	Wavelength resolution (RIU)	FWHM	Amp. sens. ( ${R I U}^{- 1}$ )	FOM
1.33	12	610	20	2000	$5 \times 10^{- 5}$	47	152	43
1.34	14	630	20	2000	$5 \times 10^{- 5}$	49	200	41
1.35	18	650	20	2000	$5 \times 10^{- 5}$	52	269	39
1.36	23	670	50	5000	$2 \times 10^{- 5}$	56	471	89
1.37	42	720	40	4000	$2.5 \times 10^{- 5}$	52	361	77
1.38	46	760	70	7000	$1.43 \times 10^{- 5}$	63	540	111
1.39	77	830	110	11,000	$9.09 \times 10^{- 6}$	70	631	157
1.40	190	940	N/A	N/A	N/A	54	N/A	N/A

Ref.	Structure Type	Polarization	Sensing Range	Wave sens. (nm/RIU)	Wave. Res. (RIU)	Amp. Sens. ( ${R I U}^{- 1}$ )	FOM
[7]	Birefringent PCF-based SPR sensor	$x$ -pol.	1.00–1.43	6300	$1.58 \times 10^{- 5}$	N/A	N/A
[37]	D-shaped hollow-core sensor	$y$ -pol.	1.33–1.34	2900	N/A	120	N/A
[19]	Graphene-based PCF SPR sensor	$x$ -pol.	1.33–1.37	5000	$2 \times 10^{- 5}$	860	N/A
[38]	D-shaped low-RI SPR sensor	$y$ -pol.	1.20–1.29	11,055	$9.05 \times 10^{- 6}$	N/A	N/A
[39]	Hollow-core-based SPR sensor	$x$ -pol.	1.27–1.45	5653	N/A	590	N/A
[40]	D-shaped plasmonic sensor	$x$ -pol.	1.33–1.38	10,493	$9.53 \times 10^{- 6}$	N/A	N/A
[41]	Graphene-based PCF sensor	$x$ -pol.	1.33–1.35	2520	$3.97 \times 10^{- 5}$	72.5	N/A
[42]	Grating-based PCF SPR sensor	$x$ -pol.	1.33–1.36	10,600	$9.43 \times 10^{- 6}$	633	N/A
This work	Asymmetric-core based biosensor	$x$ -pol	1.33–1.40	11,000	$9.09 \times 10^{- 6}$	631	157

Abstract

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Applied Optics