Magneto-photonic crystal optical sensors with sensitive covers

We report on a magneto-photonic crystal on-chip optical sensor for specific analyte detection with polypyrrole and gold nano particles as modified photonic crystal waveguide cover layers. The reaction of the active sensor material with various analytes modifies the electronic structure of the sensor...

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Veröffentlicht in:Applied physics letters 2011-08, Vol.99 (9), p.091112-091112-3
Hauptverfasser: Dissanayake, Neluka, Levy, Miguel, Chakravarty, A., Heiden, P. A., Chen, N., Fratello, V. J.
Format: Artikel
Sprache:eng
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Zusammenfassung:We report on a magneto-photonic crystal on-chip optical sensor for specific analyte detection with polypyrrole and gold nano particles as modified photonic crystal waveguide cover layers. The reaction of the active sensor material with various analytes modifies the electronic structure of the sensor layer causing changes in its refractive index and a strong transduction signal. Magneto-photonic crystal enhanced polarization rotation sensitive to the nature of the cover layer detects the index modification upon analyte adsorption. A high degree of selectivity and sensitivity are observed for aqueous ammonia and methanol with polypyrrole and for thiolated-gold- with gold-nanoparticles covers.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.3633344