Surface plasmon resonance based fiber optic sensor for the IR region using a conducting metal oxide film

Rajneesh K. Verma; Banshi D. Gupta

doi:10.1364/JOSAA.27.000846

Journal of the Optical Society of America A
Vol. 27,
Issue 4,
pp. 846-851
(2010)
•https://doi.org/10.1364/JOSAA.27.000846

Surface plasmon resonance based fiber optic sensor for the IR region using a conducting metal oxide film

Rajneesh K. Verma and Banshi D. Gupta

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Rajneesh K. Verma and Banshi D. Gupta, "Surface plasmon resonance based fiber optic sensor for the IR region using a conducting metal oxide film," J. Opt. Soc. Am. A 27, 846-851 (2010)

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Abstract

Theoretical modeling of a surface plasmon resonance (SPR) based fiber optic sensor with a conducting metal oxide [indium tin oxide (ITO)] as the SPR active material is proposed. The theoretical analysis reveals that the proposed sensing probe can be utilized for sensing in the IR region, where most of the gases show their absorption regime. Comparison of sensitivity predicts that an ITO-layer-coated SPR-based fiber optic sensor is about 60% more sensitive than a gold-coated fiber optic sensor. The physical reasons behind sensitivity enhancement are provided. Apart from this, various advantageous features of the ITO over the noble metals, silver and gold, are addressed.

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Metal	Film Thickness (nm)	$λ_{1}$ $(μ m)$ $(n_{s} = 1.20)$	$λ_{2}$ $(μ m)$ $(n_{s} = 1.21)$	Shift in Resonance Wavelength $(λ_{2} - λ_{1})$ $(μ m)$	Sensitivity $(μ m ∕ RIU)$
Gold	50	0.3831	0.3913	0.0082	0.82
ITO	70	1.3766	1.3897	0.0131	1.31

Type of Fiber Optic Probe	Sensitivity $(μ m ∕ RIU)$	Reference
Multilayer-coated D-type SPR probe	0.090 (for RI change 1.0–1.15) 6.790 (for RI change 1.33–1.37)	Allsop et al. [18]
Fiber Bragg grating (FBG) assisted SPR probe	0.30 (for RI change 1.33–1.338)	Nemova and Kashyap [19]
Side polished fiber grating -based SPR probe	0.234 (FBG) (for RI change 1.33–1.331) 1.0087 (LPG) (for RI change 1.33–1.331)	Tripathi et al. [21]
SPR probe with tilted FBG	0.454 (for RI change 1.42–1.45)	Shevchenko and Albert [20]
Long-period grating with taper	0.1738 (for RI change 1.333–1.3624)	Ding et al. [22]
ITO-film-based SPR probe	1.310 (for RI change 1.2–1.21)	Current work

Metal	Film Thickness (nm)	$λ_{1}$ $(μ m)$ $(n_{s} = 1.20)$	$λ_{2}$ $(μ m)$ $(n_{s} = 1.21)$	Shift in Resonance Wavelength $(λ_{2} - λ_{1})$ $(μ m)$	Sensitivity $(μ m ∕ RIU)$
Gold	50	0.3831	0.3913	0.0082	0.82
ITO	70	1.3766	1.3897	0.0131	1.31

Type of Fiber Optic Probe	Sensitivity $(μ m ∕ RIU)$	Reference
Multilayer-coated D-type SPR probe	0.090 (for RI change 1.0–1.15) 6.790 (for RI change 1.33–1.37)	Allsop et al. [18]
Fiber Bragg grating (FBG) assisted SPR probe	0.30 (for RI change 1.33–1.338)	Nemova and Kashyap [19]
Side polished fiber grating -based SPR probe	0.234 (FBG) (for RI change 1.33–1.331) 1.0087 (LPG) (for RI change 1.33–1.331)	Tripathi et al. [21]
SPR probe with tilted FBG	0.454 (for RI change 1.42–1.45)	Shevchenko and Albert [20]
Long-period grating with taper	0.1738 (for RI change 1.333–1.3624)	Ding et al. [22]
ITO-film-based SPR probe	1.310 (for RI change 1.2–1.21)	Current work

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Journal of the Optical Society of America A