High sensitivity gas sensor based on high-Q suspended polymer photonic crystal nanocavity
Abstract
We present high-sensitivity, multi-use optical gas sensors based on a one-dimensional photonic crystal cavity. These devices are implemented in versatile, flexible polymer materials which swell when in contact with a target gas, causing a measurable cavity length change. This change causes a shift in the cavity resonance, allowing precision measurements of gas concentration. We demonstrate suspended polymer nanocavity sensors and the recovery of sensors after the removal of stimulant gas from the system. With a measured quality factor exceeding 104, we show measurements of gas concentration as low as 600 parts per million (ppm) and an experimental sensitivity of 10 ppm; furthermore, we predict detection levels in the parts-per-billion range for a variety of gases.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jun 16, 2014
- Source ID
- 10.1063/1.4879735
Entities
People
- Dirk Englund
- Hannah Clevenson
- Pierre Desjardins
- Xuetao Gan
Organizations
- Air Force Office of Scientific Research
- Massachusetts Institute of Technology