We have experimentally demonstrated a cation and anion sensor by using short linear photonic crystal microcavities with an embedded quantum dot active region. The photonic crystal microcavity covered with an ion-selective polymer forms a submicrometer optical detection system sensitive to small changes of perchlorate anion (ClO4−) and calcium cation (Ca2+) concentrations.
© 2005 Optical Society of America
S. Chakravarty, J. Topol'ancik, P. Bhattacharya, S. Chakrabarti, Y. Kang, and M. E. Meyerhoff, "Ion detection with photonic crystal microcavities," Opt. Lett. 30, 2578-2580 (2005)