Functionalizing a Tapered Microcavity as a Gas Cell for On-Chip Mid-Infrared Absorption Spectroscopy

N. Pelin Ayerden, Julien Mandon, Frans J.M. Harren, Reinoud F. Wolffenbuttel

Research output: Contribution to journalArticleScientificpeer-review

1 Citation (Scopus)
25 Downloads (Pure)

Abstract

Increasing demand for field instruments designed to measure gas composition has strongly promoted the development of robust, miniaturized and low-cost handheld absorption spectrometers in the mid-infrared. Efforts thus far have focused on miniaturizing individual components. However, the optical absorption path that the light beam travels through the sample defines the length of the gas cell and has so far limited miniaturization. Here, we present a functionally integrated linear variable optical filter and gas cell, where the sample to be measured is fed through the resonator cavity of the filter. By using multiple reflections from the mirrors on each side of the cavity, the optical absorption path is elongated from the physical mm -level to the effective mm -level. The device is batch-fabricated at the wafer level in a CMOS-compatible approach. The optical performance is analyzed using the Fizeau interferometer model and demonstrated with actual gas measurements
Original languageEnglish
Article number2041
Number of pages14
JournalSensors
Volume17
Issue number9
DOIs
Publication statusPublished - 2017

Keywords

  • gas sensors
  • optical absorption spectroscopy
  • mid-infrared
  • microcavities
  • Fabry–Perot
  • Fizeau interferometer
  • OA-Fund TU Delft

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