Chemical sensors based on optical microresonators have been demonstrated highly sensitive by monitoring the refractive index (RI) changes in the surrounding area near the resonator surface. In an optical resonator, the Whispering Gallery Modes (WGMs) with high quality (Q) factor supported by the spherical symmetric structure interacts with the contiguous background through evanescent field. Highly sensitive detection can be realized because of the long lifetime of the photons. The computational models of solid glass microspheres and hollow glass spheres with porous wall (PW-HGM) were established. These two types of microresonators were studied through simulations. The PWHGM resonator was proved as an optimal chemical sensor and verified by experiments and compared for chemical vapor detection. The simulation and experimental results agreed well in the sensing trends for PW-HGM microresonator.


Electrical and Computer Engineering

Second Department

Nuclear Engineering and Radiation Science

Third Department

Mechanical and Aerospace Engineering


United States. Army Research Office


This research work was supported by research funding provided by U.S. Army Research Office (ARO) under contract: W911NF-10-2-0077.

Keywords and Phrases

Whispering Gallery Modes; Microresonator; Computational Model; Simulation; Porous Wall; Chemical Sensor

International Standard Serial Number (ISSN)

2326-5671; 2326-5647

Document Type

Article - Journal

Document Version

Final Version

File Type





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Creative Commons Licensing

Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 License.

Publication Date

01 Sep 2013