Abstract

We introduce a photonic crystal hetero-slab-edge microcavity design with surface mode, which is beneficial for optical index sensing. The simulated index sensitivity (Rn) as high as 675nm per refractive index unit (nm/RIU) variation is obtained with slab thickness of 180nm. In experiments, single surface mode lasing action from a real device is observed. Based on the surface mode in this microcavity, high experimental Rn value of 625nm/RIU is achieved by detecting index variation in a CO2 chamber with different gas pressures.

© 2010 Optical Society of America

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