2-D array photonic crystal sensing motif |
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Authors: | Zhang Jian-Tao Wang Luling Luo Jia Tikhonov Alexander Kornienko Nikolay Asher Sanford A |
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Affiliation: | Department of Chemistry, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA. |
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Abstract: | We have developed the first high-diffraction-efficiency two-dimensional (2-D) photonic crystals for molecular recognition and chemical sensing applications. We prepared close-packed 2-D polystyrene particle arrays by self-assembly of spreading particle monolayers on mercury surfaces. The 2-D particle arrays amazingly diffract 80% of the incident light. When a 2-D array was transferred onto a hydrogel thin film showing a hydrogel volume change in response to a specific analyte, the array spacing was altered, shifting the 2-D array diffraction wavelength. These 2-D array photonic crystals exhibit ultrahigh diffraction efficiencies that enable them to be used for visual determination of analyte concentrations. |
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