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.
|Title of host publication||Proceedings 14th Annual Symposium of the IEEE Photonics Benelux Chapter, 5-6 November 2009, Brussels, Belgium|
|Editors||St. Beri, Ph. Tassin, G. Craggs, X. Leijtens, J. Danckaert|
|Place of Publication||Brussels|
|Publisher||Brussels University Press|
|Publication status||Published - 2009|