Sensitive molecular binding assay using a photonic crystal structure in total internal reflection.

Sensitive molecular binding assay using a photonic crystal structure in total internal reflection.
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DOI:
10.1364/oe.16.011741
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发表时间:
2008-08-04
期刊:
影响因子:
3.8
通讯作者:
Ye JY
Ye JY
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Guo Y;Divin C;Myc A;Terry FL Jr;Baker JR Jr;Norris TB;Ye JY

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A novel optical sensor for label-free biomolecular binding assay using a one-dimensional photonic crystal in a total-internal-reflection geometry is proposed and demonstrated. The simple configuration provides a narrow optical resonance to enable sensitive measurements of molecular binding, and at the same time employs an open interface to enable real-time measurements of binding dynamics. Ultrathin aminopropyltriethoxysilane/glutaraldehyde films adsorbed on the interface were detected by measuring the spectral shift of the photonic crystal resonance and the intensity ratio change in a differential reflectance measurement. A detection limit of 6×10−5 nm for molecular layer thickness was obtained, which corresponds to a detection limit for analyte adsorption of 0.06 pg/mm2 or a refractive index resolution of 3×10−8 RIU; this represents a significant improvement relative to state-of-the-art surface-plasmon-resonance-based systems.
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