Scientific Results

Cavity-enhanced surface-plasmon resonance sensing: modeling and performance

Year: 2014

Authors: Giorgini A., Avino S., Malara P., Zullo R., Gagliardi G., Homola J., De Natale P.

Autors Affiliation: Consiglio Nazionale delle Ricerche, Istituto Nazionale di Ottica (INO), via Campi Flegrei, 34 – Comprensorio ‘A Olivetti’, I-80078 Pozzuoli (Naples), Italy; Institute of Photonics and Electronics, v.v.i. Chaberska 57, 182 51 Prague, Czech Republic; Consiglio Nazionale delle Ricerche, Istituto Nazionale di Ottica (INO), Largo E Fermi 6, I-50125 Firenze, Italy

Abstract: We investigate the performance of a surface-plasmon-resonance refractive-index (RI) sensor based on an optical resonator. The resonator transforms RI changes of liquid samples, interacting with the surface plasmon excited by near-infrared light, into a variation of the intra-cavity optical loss. Cavity ring-down measurements are provided as a proof of concept of RI sensing on calibrated mixtures. A characterization of the overall sensor response and noise features as well as a discussion on possible improvements is carried out. A reproducibility analysis shows that a resolution of 10(-7)-10(-8) RIU is within reach over observation times of 1-30 s. The ultimate resolution is set only by intrinsic noise features of the cavity-based method, pointing to a potential limit below 10(-10) RIU/root Hz.

Journal/Review: MEASUREMENT SCIENCE & TECHNOLOGY

Volume: 25 (1)      Pages from: 015205  to: 015205

More Information: The experiment was funded by Regione Toscana, in the frame of project POR CReO FESR 2007-2013 \’SIMPAS\’, and Italian Ministry for Education and Research (MIUR) with project PON01_01525-\’MONICA\’. The authors thank G Notariale for assistance with the electronic equipment.
KeyWords: Infrared devices; Light measurement; Optical resonators; Optical sensors; Plasmons; Refractive index; Resonance; Resonators; Spectroscopy, Cavity ring down; Cavity ring down spectroscopies; Enhanced surface; Near infrared light; Refractive index measurement; Refractive index sensor; Reproducibilities; Surface plasmons, Surface plasmon resonance
DOI: 10.1088/0957-0233/25/1/015205

Citations: 3
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