Multi-channel directional coupler as an evanescent field optical sensor | Macquarie University ResearchOnline

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Title: Multi-channel directional coupler as an evanescent field optical sensor
Related: Sensors and actuators B : chemical, Vol. 150, No. 1 (2010), p.417-424
DOI: 10.1016/j.snb.2010.06.022
Publisher: Elsevier
Date: 2010
FoR/RFCD Code(s): 030100 Analytical Chemistry 091200 Materials Engineering
Author/Creator: McCosker, Ravi J
Author/Creator: Town, Graham E
Description: We investigate the use of multi-channel directional couplers as evanescent field optical sensors. If the surrounding analyte can infiltrate the region between the array waveguides then these sensors can exploit the exponential dependence of coupling on the analyte refractive index. Analysis based on supermodes and the principle of self-imaging is used to develop design guidelines for optimizing sensor performance. It is shown that the quasi-periodic characteristic of these sensors facilitates a trade-off between sensitivity and device length.
Description: 8 page(s)
Subject Keyword: 030100 Analytical Chemistry
Subject Keyword: 091200 Materials Engineering
Subject Keyword: optical sensor
Subject Keyword: evanescent field
Subject Keyword: directional coupler
Subject Keyword: multi-mode interference
Subject Keyword: supermode
Subject Keyword: analyte
Resource Type: journal article
Organisation: Macquarie University. Dept. of Electronic Engineering

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