Evanescent-wave comb spectroscopy of liquids with strongly dispersive optical fiber cavities

Year: 2013

Authors: Avino S., Giorgini A., Salza M., Fabian M., Gagliardi G., De Natale P.

Autors Affiliation: Consiglio Nazionale delle Ricerche, Istituto Nazionale di Ottica (INO), via Campi Flegrei, 34-Comprensorio A. Olivetti, Pozzuoli, Naples 80078, Italy; Consiglio Nazionale delle Ricerche, Istituto Nazionale di Ottica (INO) Largo E. Fermi 6, I-50125 Firenze, Italy

Abstract: We demonstrate evanescent-wave fiber cavity-enhanced spectroscopy in the liquid phase using a near-infrared frequency comb. Exploiting strong fiber-dispersion effects, we show that liquid absorption spectra can be recorded without any external dispersive element. The fiber cavity is used both as sensor and spectrometer. The resonance modes are frequency locked to the comb teeth while the cavity photon lifetime is measured over 155 nm, from 1515 nm to 1670 nm, where absorption bands of liquid polyamines are detected as a proof of concept. Our fiber spectrometer lends itself to in situ, real-time chemical analysis in environmental monitoring, biomedical assays, and micro-opto-fluidic systems. (C) 2013 AIP Publishing LLC.


Volume: 102 (20)      Pages from: 201116  to: 201116

More Information: The experimental work was funded by CNR with Project No. DG.RSTL.111.003 and MIUR with Progetto Operativo Nazionale (PON), PON01_01525-MONICA. M.F. thanks CNR “short-term mobility” program that supported his visit at CNR-INO. The authors are grateful to B. Patrizi and S. Mackenzie for helpful discussions.
KeyWords: Cavity enhanced spectroscopy; Cavity photons; Dispersive elements; Environmental Monitoring; Frequency combs; Optical fiber cavity; Proof of concept; Resonance mode, Assays; Dispersion (waves); Fibers; Optical fiber communication; Optical fibers; Spectrometers, Liquids
DOI: 10.1063/1.4807680

Citations: 13
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