Photonic crystal resonator integrated in a microfluidic system

Pedro André Rodrigues de Sousa Nunes, Niels Asger Mortensen, Jörg Peter Kutter, Klaus Bo Mogensen

Research output: Contribution to journalJournal articleResearchpeer-review


We report on a novel optofluidic system consisting of a silica-based 1D photonic crystal, integrated planar waveguides, and electrically insulated fluidic channels. An array of pillars in a microfluidic channel designed for electrochromatography is used as a resonator for on-column label-free refractive index detection. The resonator was fabricated in a silicon oxynitride platform, to support electro-osmotic flow, and operated at =1.55 m. Different aqueous solutions of ethanol with refractive indices ranging from n1.3330 to 1.3616 were pumped into the column/resonator, and the transmission spectra were recorded. Linear shifts of the resonant wavelengths yielded a maximum sensitivity of /n=480 nm/RIU (refractive index unit), and a minimum difference of n=0.007 RIU was measured.
Original languageEnglish
JournalOptics Letters
Issue number14
Pages (from-to)1623-1625
Publication statusPublished - 2008


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