S. Chakravarty, J. Topolancik, P. Bhattacharya, S. Chakrabarti, Y. Kang, M. Meyerhoff
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Photonic crystal microcavity source based ion sensor
An optical ion sensor based on the shifts of resonance of a photonic crystal microcavity coated with an ion sensing polymer is demonstrated. A 20nm shift is observed for perchlorate ion and a 5nm shift is observed for calcium cation