Refractive Index Sensor based on an Optical Microresonator using a Hollow Sphere with Porous Wall

Abstract

An optical microresonator based upon a hollow sphere with a porous wall has been proposed for use as a refractive index sensor. the sensor structure was created by coupling a Porous Wall Hollow Glass Microsphere (PW-HGM) to a single mode fiber taper (Corning SMF-28). the experimental results showed that the PW-HGM can be effectively stimulated by evanescent waves propagating through a single mode fiber taper when the coupling modes match. the Quality-factor (Q-factor) and Free Spectral Range (FSR) were measured for a variety of PW-HGMs ranging in size from 10μm to 100μm in diameter. When the microresonator system was tested in a vapor sample, the resonant wavelengths of the microresonator system drifted with respect to the change in refractive index. after discussing the experimental, this microresonator sensing method, which employs porous microspheres instead of solid spheres, demonstrates noteworthy progress in excitation efficiency when compared with other methods. in addition, this system demonstrates effective excitation of high-sensitivity microcavity resonances. © 2011 ISA.

Department(s)

Electrical and Computer Engineering

Keywords and Phrases

Free spectrum range; Liquid concentration; Microsphere; Porous Wall Hollow Glass Microsphere; Quality factor; Whispering gallery mode

International Standard Book Number (ISBN)

978-161839032-5

International Standard Serial Number (ISSN)

1558-8041

Document Type

Article - Conference proceedings

Document Version

Citation

File Type

text

Language(s)

English

Rights

© 2024 ISA Services, Inc., All rights reserved.

Publication Date

30 Sep 2011

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