Scientific Results

Surface plasmon resonance optical cavity enhanced refractive index sensing

Year: 2013

Authors: Giorgini A., Avino S., Malara P., Gagliardi G., Casalino M., Coppola G., Iodice M., Adam P., Chadt K., Homola J., De Natale P.

Autors Affiliation: Consiglio Nazionale delle Ricerche, Istituto Nazionale di Ottica (INO), via Campi Flegrei, 34—Comprensorio A. Olivetti, 80078 Pozzuoli (Naples), Italy; Consiglio Nazionale delle Ricerche, Istituto Nazionale di Ottica (INO), Largo E. Fermi 6—50125 Firenze, Italy; Consiglio Nazionale delle Ricerche, Istituto per la Microelettronica e Microsistemi (IMM), via Pietro Castellino, 111—80131 Naples, Italy; Institute of Photonics and Electronics Chaberska 57, Prague 182 51, Czech Republic

Abstract: We report on a method for surface plasmon resonance (SPR) refractive index sensing based on direct time-domain measurements. An optical resonator is built around an SPR sensor, and its photon lifetime is measured as a function of loss induced by refractive index variations. The method does not rely on any spectroscopic analysis or direct intensity measurement. Time-domain measurements are practically immune to light intensity fluctuations and thus lead to high resolution. A proof of concept experiment is carried out in which a sensor response to liquid samples of different refractive indices is measured. A refractive index resolution of the current system, extrapolated from the reproducibility of cavity-decay time determinations over 133 s, is found to be about 10(-5) RIU. The possibility of longterm averaging suggests that measurements with a resolution better than 10(-7) RIU/root Hz are within reach. (C) 2013 Optical Society of America

Journal/Review: OPTICS LETTERS

Volume: 38 (11)      Pages from: 1951  to: 1953

More Information: The work was funded by Regione Toscana, in the frame of project POR CReO FESR 2007-2013 \”SIMPAS,\”Italian Ministry for Education and Research (MIUR) with project PON01_01525-\”MONICA,\”Praemium Academiae of the Academy of Sciences of the Czech Republic and Czech Science Foundation (contract no. P205/12/G118). S.A. acknowledges support by MIUR with project FIRB RBFR10Q0PT_001 \”DROPS. \”The authors thank G.Notariale for assistance on the electronic equipment.
KeyWords: Intensity measurements; Light intensity fluctuations; Proof of concept; Refractive index sensing; Refractive index variations; Reproducibilities; Time determination; Time domain measurement, Plasmons; Sensors; Spectroscopic analysis; Surface plasmon resonance; Time domain analysis, Refractive index, light related phenomena; procedures; surface plasmon resonance; time, Optical Processes; Surface Plasmon Resonance; Time Factors
DOI: 10.1364/OL.38.001951

Citations: 25
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