Label-Free Microlaser for Qualitative and Quantitative Gas Detection AdvSciNews graphene gas gassensing microlaser
By Shaheer RehanOct 13 2022Reviewed by Megan Craig, M.Sc. Light-matter interactions enhanced by optical microcavities provide a potent tool in the form of microresonators for quick and accurate sensing methods. Such tools pave the way for applications in molecule sensing applications, including nanoparticles, cells, and larger molecules.
The graphene-functionalized microlaser enabled lab-free multispecies gas detection from gas mixtures as well as molecular-level gas detection with ultra-high sensitivity. Related StoriesA whispering guide mode micro cavity provides distinct benefits when used in chemical and biological sensing. It offers high-frequency resolution in the sub-megahertz range by determining the passive interference among various cavity modes and the shift or widening mode resonances.
Two-dimensional materials can be hybridized with microcavities, such as WGM-based microresonators. This provides a new approach for increased interaction among photons and electrons and thus creates a unique gas detection platform. The backward scatter caused by the graphene monolayer led to symmetry breaking as well as mode splitting at particular frequencies, which could be accurately detected using an optoelectronic heterodyne beating.
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