Surface Plasmon Resonance Sensing Enhancement Using Gold Nanoparticles

Weihua Shi; Huajin Wang; Mingyu Shangguan

doi:10.3788/LOP231857

Laser & Optoelectronics Progress, Volume. 61, Issue 13, 1306003(2024)

Surface Plasmon Resonance Sensing Enhancement Using Gold Nanoparticles

Weihua Shi^*, Huajin Wang, and Mingyu Shangguan

College of Electronic and Optical Engineering, College of Flexible Electronics (Future Technology), Nanjing University of Posts and Telecommunications, Nanjing 210023, Jiangsu , China

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Figures & Tables(9)

Fig. 1. Cross section of D-shaped SPR-PCF sensing structure enhanced by gold nanoparticles

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$Variation curves of effective refractive index real part (black solid line containing point B) and effective refractive index imaginary part (red dotted line containing peak C) versus wavelength for the core mode, and variation curves of effective refractive index real part (blue dotted dashed line containing point A) versus wavelength for SPP mode, where the inset plots (a), (b), (c) are the distribution of the mode field at A, B, and peak C, respectively when n=1.390$

Fig. 2. Variation curves of effective refractive index real part (black solid line containing point B) and effective refractive index imaginary part (red dotted line containing peak C) versus wavelength for the core mode, and variation curves of effective refractive index real part (blue dotted dashed line containing point A) versus wavelength for SPP mode, where the inset plots (a), (b), (c) are the distribution of the mode field at A, B, and peak C, respectively when n=1.390

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$(a) The core loss curve of the D-shaped SPR-PCF structure when the refractive index range is 1.370‒1.400; (b) the linear fitting diagram of resonance wavelength and refractive index of the D-shaped SPR-PCF structure$

Fig. 3. (a) The core loss curve of the D-shaped SPR-PCF structure when the refractive index range is 1.370‒1.400; (b) the linear fitting diagram of resonance wavelength and refractive index of the D-shaped SPR-PCF structure

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$Variation curves of effective refractive index real part (black solid line containing point B) and effective refractive index dotted part (red dotted line containing peak C) versus wavelength for the core mode, and variation curves of effective refractive index real part (blue dotted dashed line containing point A) versus wavelength for SPP mode, where the inset plots (a),(c),(e) are the mode field distributions of the fibre core at A, B, and peak C, respectively, and (b),(d),(f) are the mode field distributions of the gold nanoparticles on the contact surface of the gold film at A, B, and peak C, respectively when n=1.390$

Fig. 4. Variation curves of effective refractive index real part (black solid line containing point B) and effective refractive index dotted part (red dotted line containing peak C) versus wavelength for the core mode, and variation curves of effective refractive index real part (blue dotted dashed line containing point A) versus wavelength for SPP mode, where the inset plots (a),(c),(e) are the mode field distributions of the fibre core at A, B, and peak C, respectively, and (b),(d),(f) are the mode field distributions of the gold nanoparticles on the contact surface of the gold film at A, B, and peak C, respectively when n=1.390

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$(a) The core loss curve corresponding to different DAu when n =1.390; (b) the linear fitting diagram of resonance wavelength and refractive index with different DAu$

Fig. 5. (a) The core loss curve corresponding to different D_Au when n =1.390; (b) the linear fitting diagram of resonance wavelength and refractive index with different D_Au

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$(a) The core loss curve corresponding to different LAuwhen n =1.390; (b) the linear fitting diagram of resonance wavelength and refractive index with different LAu$

Fig. 6. (a) The core loss curve corresponding to different L_Auwhen n =1.390; (b) the linear fitting diagram of resonance wavelength and refractive index with different L_Au

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$(a) The core loss curve of the gold nanoparticles enhanced D-shaped SPR-PCF structure when the refractive index range is 1.370‒1.400; (b) the linear fitting diagram of resonance wavelength and refractive index of the gold nanoparticles enhanced D- shaped SPR-PCF structure$

Fig. 7. (a) The core loss curve of the gold nanoparticles enhanced D-shaped SPR-PCF structure when the refractive index range is 1.370‒1.400; (b) the linear fitting diagram of resonance wavelength and refractive index of the gold nanoparticles enhanced D- shaped SPR-PCF structure

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Table 1. Comparison of sensing characteristics under different structural parameters

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Table 1. Comparison of sensing characteristics under different structural parameters

Parameter		Wavelength /nm	Loss /（dB/m）	FWHM /nm	Average sensitivity /（nm/RIU）	Averagelinearity
Thickness of gold film t /nm	40	780	574	38	7170	0.94
	45	803	391	50	7810	0.93
	50	818	266	66	8580	0.89
Distance from fiber core to polishing surface D /μm	2.9	795	501	47	7340	0.95
	3.0	803	391	50	7810	0.93
	3.1	809	321	53	8320	0.88
Air hole spacing L /μm	1.9	829	243	67	12140	0.76
	2.0	803	391	50	7810	0.93
	2.1	785	636	38	6820	0.96
Large air hole diameter d_l /μm	0.70L	804	378	49	7920	0.89
	0.75L	803	391	50	7810	0.93
	0.80L	802	406	45	7670	0.94
Small air hole diameter d_s /μm	0.75d_l	797	789	47	7380	0.94
	0.80d_l	803	391	50	7810	0.93
	0.85d_l	810	171	51	9140	0.86

Table 2. Comparison with existing research results

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Table 2. Comparison with existing research results

Reference	Sensing structure	Sensitivity /（nm/RIU）
Reference	Sensing structure	Without gold nanoparticles	With gold nanoparticles
［10］	PCS/Au/ gold NPs	2122	3074
［11］	SMF/Au/gold NPs	3438	5140
［12］	MMF/Au/ gold NPs	1827	3164
［13］	MMF/Au/gold NPs	3768	4465
［14］	SMF/Au（GO）/gold NPs	2102	3436
This work	PCF/Au/gold NPs	7810	9940

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Weihua Shi, Huajin Wang, Mingyu Shangguan. Surface Plasmon Resonance Sensing Enhancement Using Gold Nanoparticles[J]. Laser & Optoelectronics Progress, 2024, 61(13): 1306003

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Paper Information

Category: Fiber Optics and Optical Communications

Received: Aug. 7, 2023

Accepted: Oct. 23, 2023

Published Online: Jul. 17, 2024

The Author Email: Weihua Shi (njupt_shiwh@126.com)

DOI:10.3788/LOP231857

CSTR:32186.14.LOP231857

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology