Nanocavity plasmonic device for ultrabroadband single molecule sensing

Ryan M. Gelfand, Lukas Bruderer, Hooman Mohseni*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

We present a new structure that combines a metal-dielectric-metal sandwich with a periodic structure to form a plasmon polariton photonic crystal. Three-dimensional finite-difference time-domain simulations show a clear bandgap in the terahertz regime. We exploited this property by adding a defect to the crystal, which produces a cavity with a quality factor of 23.3 at a wavelength of 3.45 μm. Despite the small Q factor, the ultrasmall sensing volume of 15 zeptoliters produces an extremely large Purcell constant of 4.8 × 10 6. Compared to photonic crystals with similar Purcell constant, the bandwidth is several orders of magnitude larger, or about 7 THz, ensuring high tolerances to manufacturing parameters, and environmental changes, as well as a high specificity owing to the possibility of broadband spectral fingerprint detection.

Original languageEnglish (US)
Pages (from-to)1087-1089
Number of pages3
JournalOptics Letters
Volume34
Issue number7
DOIs
StatePublished - Apr 1 2009

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

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