Photonic crystal nanostructures for optical biosensing applications

D. Dorfner, T. Zabel, T. Hürlimann, N. Hauke, Lars Hagedorn Frandsen, U. Rant, G. Abstreiter, J. Finley

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    We present the design, fabrication and optical investigation of photonic crystal (PhC) nanocavity drop filters for use as optical biosensors. The resonant cavity mode wavelength and Q-factor are studied as a function of the ambient refractive index and as a function of adsorbed proteins (bovine serum albumin) on the sensor surface. Experiments were performed by evanescent excitation of the cavity mode via a PhC waveguide. This in turn is coupled to a ridge waveguide that allows the introduction of a fluid flow cell on a chip. A response of ∂λ/∂c=(4.54±0.66)×105 nm/M is measured leading to a measured detection limit as good as fg or pg/mm2in the sensitive area.
    Original languageEnglish
    JournalBiosensors and Bioelectronics
    Volume24
    Issue number12
    Pages (from-to)3688-3692
    ISSN0956-5663
    DOIs
    Publication statusPublished - 2009

    Keywords

    • optical biosensor
    • nanostructure
    • photonic crystal
    • silicon
    • nanocavity

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