Mid-IR absorption sensing of heavy water using a silicon-on-sapphire waveguide

Neetesh Singh, Alvaro Casas-Bedoya*, Darren D. Hudson, Andrew Read, Eric Mägi, Benjamin J. Eggleton

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

28 Citations (Scopus)


We demonstrate a compact silicon-on-sapphire (SOS) strip waveguide sensor for mid-IR absorption spectroscopy. This device can be used for gas and liquid sensing, especially to detect chemically similar molecules and precisely characterize extremely absorptive liquids that are difficult to detect by conventional infrared transmission techniques. We reliably measure concentrations up to 0.25% of heavy water (D2O) in a D2OH2O mixture at its maximum absorption band at around 4 μm. This complementary metal-oxidesemiconductor (CMOS) compatible SOS D2O sensor is promising for applications such as measuring body fat content or detection of coolant leakage in nuclear reactors.

Original languageEnglish
Pages (from-to)5776-5779
Number of pages4
JournalOptics Letters
Issue number24
Publication statusPublished - 15 Dec 2016
Externally publishedYes


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