Applied Optics · 2010 · 31 citations · 26 references
EngineeringMaterials EngineeringMaterials SciencePhotonicsSensorsThin FilmsChemical SensorsOptical SensingOptical SensorsOptical Thin FilmsSensor MaterialsThin Film Optical PropertiesChemical Optical SensorsDetection Limit EstimationFilm ThicknessOptical Chemical SensingSensor FunctionalizationSensor SensitivityThin-film SensorsUltrasensitive Detection
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.
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Protein detection by optical shift of a resonant microcavity
Frank Vollmer, Dieter Braun, Albert Libchaber et al. · Applied Physics Letters · 2002 · 902 citations