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Journal of Nanophotonics

Numerical study on an optical waveguide cantilever sensor
Author(s): Guofang Fan; Yuan Li; Chunguang Hu; Lihua Lei; Hongyu Li
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Paper Abstract

An optical waveguide cantilever sensor is introduced, which is determined by monitoring the coupling efficiency between a waveguide cantilever and a waveguide receptor through the cantilever bending. A straightforward model is developed for an optical waveguide cantilever sensor, in which the coupling efficiency between the cantilever and receptor is calculated using the overlap integral. An effective index is introduced to analyze the thickness of input/output waveguides and cantilever for a maximum coupling with a fiber keeping the single-mode operation. The relationship of the optical waveguide sensor (cantilever, gap, and output waveguide) and the sensitivity is presented. As a consequence, we take an optical waveguide cantilever sensor structure of Si 3 N 4 / SiO 2 / Si as an example, and an optimized design is reported. Moreover, the analysis model is compared with a finite-difference beam propagation method. The result means that our model has a similar accuracy but is more simple, intuitive, and time-saving.

Paper Details

Date Published: 12 May 2017
PDF: 8 pages
J. Nanophoton. 11(2) 026007 doi: 10.1117/1.JNP.11.026007
Published in: Journal of Nanophotonics Volume 11, Issue 2
Show Author Affiliations
Guofang Fan, Beijing Jiaotong Univ. (China)
Yuan Li, Shanghai Institute of Measurement and Testing Technology (China)
Chunguang Hu, Tianjin Univ. (China)
Lihua Lei, Shanghai Institute of Measurement and Testing Technology (China)
Hongyu Li, Shandong Univ. of Science and Technology (China)


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