title: Ultrasensitive chemical sensors based on whispering gallery modes in a microsphere coated with zeolite.
abstract: 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.
authors.affiliation: Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, 100081, China.
authors.forename: Nai
authors.initials: N
authors.lastname: Lin
authors.forename: Lan
authors.initials: L
authors.lastname: Jiang
authors.forename: Sumei
authors.initials: S
authors.lastname: Wang
authors.forename: Lei
authors.initials: L
authors.lastname: Yuan
authors.forename: Hai
authors.initials: H
authors.lastname: Xiao
authors.forename: Yongfeng
authors.initials: Y
authors.lastname: Lu
authors.forename: Hailung
authors.initials: H
authors.lastname: Tsai
mesh_terms: D000327:Adsorption; D015374:Biosensing Techniques; D003198:Computer Simulation; D004867:Equipment Design; D008863:Microspheres; D015233:Models, Statistical; D055095:Optics and Photonics; D011506:Proteins / Q000737:chemistry; D012031:Refractometry; D017641:Zeolites / Q000737:chemistry*
chemical_list: D011506:Proteins; D017641:Zeolites