High-index sensitivity of surface mode in photonic crystal hetero-slab-edge microcavity

Tsan Wen Lu*, Yi Hua Hsiao, Wei De Ho, Po Tsung Lee

*Corresponding author for this work

Research output: Contribution to journalArticle

17 Scopus citations

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 (R n ) as high as 675 nm per refractive index unit (nm/RIU) variation is obtained with slab thickness of 180 nm. In experiments, single surface mode lasing action from a real device is observed. Based on the surface mode in this microcavity, high experimental R n value of 625 nm/RIU is achieved by detecting index variation in a CO 2 chamber with different gas pressures.

Original languageEnglish
Pages (from-to)1452-1454
Number of pages3
JournalOptics Letters
Volume35
Issue number9
DOIs
StatePublished - 1 May 2010

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