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Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing
08:12

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Published on: March 13, 2013

On-chip gas detection in silicon optical microcavities.

Jacob T Robinson1, Long Chen, Michal Lipson

  • 1Department of Electrical and Computer Engineering, Cornell University, Ithaca, NY 14853, USA. jtr26@cornell.edu

Optics Express
|June 11, 2008
PubMed
Summary

We developed a chip-scale photonic system for detecting gas composition and pressure at room temperature. This silicon microring resonator achieves high sensitivity for acetylene gas sensing.

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Area of Science:

  • Photonics
  • Optical sensing
  • Materials science

Background:

  • Gas sensing technologies are crucial for environmental monitoring and industrial safety.
  • Existing methods often require complex setups or elevated temperatures.
  • Miniaturized, room-temperature sensors offer significant advantages in portability and energy efficiency.

Purpose of the Study:

  • To demonstrate a chip-scale photonic system for gas detection.
  • To utilize a slotted silicon microring resonator for sensing acetylene gas.
  • To achieve high sensitivity and resolution in refractive index measurements.

Main Methods:

  • Fabrication of a slotted silicon microring resonator on a chip.
  • Measurement of resonance wavelength shifts in response to acetylene gas.
  • Analysis of shifts correlated with gas pressure and refractive index changes.
  • Utilizing near-infrared spectroscopy for detection.

Main Results:

  • The system successfully detected the presence and pressure of acetylene gas.
  • Achieved a refractive index resolution as small as 10(-4).
  • Observed device sensitivity of 490 nm/refractive index unit, enhanced by the slot-waveguide geometry.

Conclusions:

  • A chip-scale photonic system enables room-temperature gas sensing.
  • Slotted silicon microring resonators provide a sensitive platform for gas composition and pressure detection.
  • The demonstrated technology has potential for miniaturized, efficient gas sensing applications.