Abstract
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 language | English |
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Journal | Optics Letters |
Volume | 33 |
Issue number | 14 |
Pages (from-to) | 1623-1625 |
ISSN | 0146-9592 |
DOIs | |
Publication status | Published - 2008 |