Ultrasensitive Chemical Sensors Based on Whispering Gallery Modes in a Microsphere Coated with Zeolite
We propose a highly sensitive chemical sensor by functionally coating a zeolite film on the external surface of an optical microsphere. Using the perturbation theory, a model is developed to calculate sensor sensitivity and analyze the impact of the zeolite film thickness. The quality factor and detection limit are also investigated by using an approximate model. Simulations show that a zeolite coating can effectively increase sensitivity. The results provide physical insights for the design and optimization of various parameters for desired sensor performance. © 2010 Optical Society of America.
N. Lin et al., "Ultrasensitive Chemical Sensors Based on Whispering Gallery Modes in a Microsphere Coated with Zeolite," Applied Optics, Optical Society of America, Jan 2010.
The definitive version is available at http://dx.doi.org/10.1364/AO.49.006463
Mechanical and Aerospace Engineering
Electrical and Computer Engineering
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