Photonic crystal nanostructures for optical biosensing applications

Research output: Contribution to journalJournal article – Annual report year: 2009Researchpeer-review

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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
CitationsWeb of Science® Times Cited: No match on DOI

    Research areas

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