Integrated optics nano-opto-fluidic sensor based on whispering gallery modes for picoliter volume refractometry

G. Gilardi, R. Beccherelli

Research output: Contribution to journalArticleAcademicpeer-review

9 Citations (Scopus)
2 Downloads (Pure)

Abstract

We propose and numerically investigate an integrated optics refractometric nano-opto-fluidic sensor based on whispering gallery modes in sapphire microspheres. A measurand fluid is injected in a micromachined reservoir defined in between the microsphere and an optical waveguide. The wavelength shift due to changes in the refractive index of the measurand fluid are studied for a set of different configurations by the finite element method and a high sensitivity versus fluid volume is found. The proposed device can be tailored to work with a minimum fluid volume of 1 pl and a sensitivity up of 2000 nm/(RIUnl). We introduce a figure of merit which quantifies the amplifying effect on the sensitivity of high quality factor resonators and allows us to compare different devices.
Original languageEnglish
Article number105104
Pages (from-to)1-9
Number of pages9
JournalJournal of Physics D: Applied Physics
Volume46
Issue number10
DOIs
Publication statusPublished - 2013

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