Refractive index sensing with an InGaAsP photonic crystal membrane cavity by means of photoluminescence

E.C.I. Ryckebosch, M.A. Dündar, R. Nötzel, F. Karouta, L.J. IJzendoorn, van, R.W. Heijden, van der

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We report the experimental investigation of several types of InGaAsP photonic crystal membrane cavities with embedded InAs quantum dots for use as refractive index sensors. The cavities are read out by photoluminescence, avoiding the need to couple them to waveguides. The sensitivities are determined from infiltration of the cavities with sugar-water solutions with known refractive index. The sensitivities increase markedly when the resonance frequency approaches the air band and correlate inversely with the quality factor. A maximum sensitivity of 425 nm per refractive index unit is found, a value among the highest reported so far. Preliminary surface functionalization for use as a biosensor is also reported.
Original languageEnglish
Title of host publicationProceedings 14th Annual Symposium of the IEEE Photonics Benelux Chapter, 5-6 November 2009, Brussels, Belgium
EditorsSt. Beri, Ph. Tassin, G. Craggs, X. Leijtens, J. Danckaert
Place of PublicationBrussels
PublisherBrussels University Press
ISBN (Print)978-90-5487-650-2
Publication statusPublished - 2009

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