Refractometric gas sensing using a whispering gallery mode microresonator coated with a supra-micron sol-gel layer
| Autor: | Elena A. Romanova, Mile Ivanda, Davor Ristić, Daniil Zhivotkov |
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| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Analyte
Materials science 02 engineering and technology 010402 general chemistry Tracking (particle physics) 01 natural sciences Inorganic Chemistry Electric field Molecule Gassensing Microresonators Optics Electrical and Electronic Engineering Physical and Theoretical Chemistry Spectroscopy Sol-gel business.industry Organic Chemistry 021001 nanoscience & nanotechnology Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials Optoelectronics Whispering-gallery wave 0210 nano-technology business Refractive index Layer (electronics) |
| Popis: | Spherical microresonators have been used to measure small concentrations of ammonia vapors. By tracking the shift of a whispering gallery mode (WGM) frequency, we can detect small changes of the refractive index of the medium in which the WGM electric field is confined. These changes are correlated to the chemical content of the medium. When a porous layer of silica (SiO2) is coated onto a silica sphere surface, molecules of the gas analyte can diffuse into the layer and interact with the WGM electric field thus increasing the sensitivity of analyte detection. In this paper, we present a theoretical analysis of the phenomenon and demonstrate both theoretically and experimentally that the sensitivity of the WGM sensors for ammonia gas detection can be significantly increased by varying the thickness of the porous coating. |
| Databáze: | OpenAIRE |
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