Photonic crystal slab sensor with enhanced surface area

Christopher Kang, Christopher T. Phare, Yurii A. Vlasov, Solomon Assefa, Sharon M. Weiss

Research output: Contribution to journalArticlepeer-review


In this work, we demonstrate improved molecular detection sensitivity for silicon slab photonic crystal cavities by introducing multiplehole defects (MHDs), which increase the surface area available for labelfree detection without degrading the quality factor. Compared to photonic crystals with L3 defects, adding MHDs into photonic crystal cavities enabled a 44% increase in detection sensitivity towards small refractive index perturbations due to surface monolayer attachment of a small aminosilane molecule. Also, photonic crystals with MHDs exhibited 18% higher detection sensitivity for bulk refractive index changes.

Original languageEnglish (US)
Pages (from-to)27930-27937
Number of pages8
JournalOptics Express
Issue number26
StatePublished - Dec 20 2010
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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