Study of LSPR Spectral Analysis Techniques on SPR Optical Fiber Sensors

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P. S. S. dos Santos
José M. M. M. de Almeida
Luís C. C. Coelho

Abstract

Nanoparticles create localized surface plasmonic resonances (LSPR) with lower surrounding refractive index (SRI) sensitivities than their propagating SPR counterpart, originated in thin films. Historically, LSPR SRI sensitivities enhancements were achieved through spectral analysis methods that focus on unique spectral features. Herein, a study using that methodology was applied on SPR devices resulting in an increased sensitivity to SRI. It was found that by applying the inflection point method on optical fiber SPR sensors resulted in both sensitivity and resolution increments up to 44 and 35 %, respectively, in the SRI range from 1.3333 to 1.4150. Thus, successfully improving sensing capabilities of SPR based optical fiber sensors.

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Author Biographies

P. S. S. dos Santos, INESC TEC, Centre of Applied Photonics; Faculty of Sciences, University of Porto; Faculty of Engineering, University of Porto

INESC TEC, Centre of Applied Photonics

Rua do Campo Alegre 687

4169-007 PORTO

Portugal

 

Faculty of Sciences

University of Porto

Rua do Campo Alegre

4169-007 PORTO

Portugal

 

Faculty of Engineering

University of Porto

Rua Dr. Roberto Frias

4200-465 PORTO

Portugal

José M. M. M. de Almeida, INESC TEC, Centre of Applied Photonics; School of Science and Technology, University of Trás-os-Montes e Alto Douro

INESC TEC, Centre of Applied Photonics

Rua do Campo Alegre 687

4169-007 PORTO

Portugal

 

Department of Physics

School of Science and Technology

University of Trás-os-Montes e Alto Douro

5001-801 VILA REAL

Portugal

Luís C. C. Coelho, INESC TEC, Centre of Applied Photonics; Faculty of Sciences, University of Porto

INESC TEC, Centre of Applied Photonics

Rua do Campo Alegre 687

4169-007 PORTO

Portugal

 

Department of Physics and Astronomy

Faculty of Sciences

University of Porto

Rua do Campo Alegre

4169-007 PORTO

Portugal