Non-dispersive infrared (NDIR) gas sensing technique analyses a target gas based on its characteristic absorption wavelengths in the infrared spectrum. In an NDIR gas sensor, infrared radiation from a broadband source passes through and interacts with the sample gases in a chamber. Due to the lack of pixel level spectral selectivity, the optical detector in the NDIR gas sensor has to pair with a bandpass filter to selectively detect the attenuation to the infrared energy caused by the target gas. To measure multiple target gases at the same time, one can simply implement many pairs of “bandpass filter + infrared detector”. However, this inevitably increases the overall size and complexity of the gas sensor. In this paper, we propose using narrowband plasmonic metamaterial absorber (PMA) to introduce pixel level spectral selectivity to infrared detectors and thus eliminating the requirement of separate bandpass filters. By inserting the PMA integrated narrowband detector array into the NDIR gas sensor, multiple gases can be analyzed with significantly reduced device footprint. When fully developed, the proposed device platform should be very useful in infrared spectroscopy.
We investigated a nanoantenna integrated thermomechanical infrared pixel based on bi-material nanobeam. Three bilayer configurations are numerically studied and optimized towards maximum thermomechanical deflection. The integrated optical nanoantennae are geometrically tuned to reach the highest optical absorption at 6 μm. Thermal time constants and fundamental noise equivalent powers of the three bilayer configurations are also calculated. We also discuss the potential implementation of our detector as an infrared polarimetric sensor.
We report an integrated fiber-optic detector by dip coating PbS colloidal quantum dots onto a pretreated specialty fiber. We measured the readout current at 1550nm as a function of the optical power, the bias voltage and the distance between the contact electrodes.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.