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Journal of Lightwave Technology

Journal of Lightwave Technology

| A JOINT IEEE/OSA PUBLICATION

  • Vol. 27, Iss. 23 — Dec. 1, 2009
  • pp: 5240–5245

Cavity-Enhanced IR Absorption in Planar Chalcogenide Glass Microdisk Resonators: Experiment and Analysis

Juejun Hu, Nathan Carlie, Laeticia Petit, Anu Agarwal, Kathleen Richardson, and Lionel C. Kimerling

Journal of Lightwave Technology, Vol. 27, Issue 23, pp. 5240-5245 (2009)


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Abstract

Planar microdisk optical resonators fabricated from Ge$_{23}$Sb$_{7}$S$_{70}$ chalcogenide glass on a silicon substrate are applied for cavity-enhanced spectroscopic measurement of chemical molecular absorption fingerprint. A 0.02 cm$^{- 1}$ detection limit for these devices is demonstrated. This detection limit represents a threefold improvement as compared to a straight waveguide sensor, while the physical device length is reduced by 40-fold. The reduction in device footprint with enhanced sensitivity makes the structure attractive for “sensor-on-a-chip” device applications. We also present a design optimization approach for cavity-enhanced IR absorption spectroscopy using traveling-wave resonators, which indicates that further performance improvement can be achieved in optimally coupled, low-loss resonant cavities.

© 2009 IEEE

Citation
Juejun Hu, Nathan Carlie, Laeticia Petit, Anu Agarwal, Kathleen Richardson, and Lionel C. Kimerling, "Cavity-Enhanced IR Absorption in Planar Chalcogenide Glass Microdisk Resonators: Experiment and Analysis," J. Lightwave Technol. 27, 5240-5245 (2009)
http://www.opticsinfobase.org/jlt/abstract.cfm?URI=jlt-27-23-5240

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