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Technological University Dublin
Optical Resonators; Micro-optical Devices; Fiber Optic Sensors; Micro structured fibers
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Full-Text Articles in Engineering
Compact Humidity Sensor Based On A Multi-Layer Agarose Hydrogel Coated Silica Microsphere Resonator, Arun Mallik, Yuliya Semenova, Vishnu Kavungal, Dejun Liu
Compact Humidity Sensor Based On A Multi-Layer Agarose Hydrogel Coated Silica Microsphere Resonator, Arun Mallik, Yuliya Semenova, Vishnu Kavungal, Dejun Liu
Conference Papers
In this paper we report on a novel approach to implementing a compact humidity sensor that utilizes whispering gallery mode (WGM) phenomena in a silica microsphere coated with Agarose hydrogel. The spectral positions of the WGM resonances for such a sensor depend strongly on the refractive index and thickness of the coating. The WGM’s spectral shift occurs due to adsorption/desorption of the water vapor in response to changes in ambient humidity and also due to the corresponding changes of the coating thickness. We experimentally investigated the WGMs spectral shift for a 100 μm diameter silica microsphere coated with Agarose hydrogel …