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Complete mode structure analysis of tilted Bragg grating refractometers in planar waveguides toward absolute index measurement

Complete mode structure analysis of tilted Bragg grating refractometers in planar waveguides toward absolute index measurement
Complete mode structure analysis of tilted Bragg grating refractometers in planar waveguides toward absolute index measurement
Tilted Bragg grating refractometers are ideal devices for sensing applications. They work by diffracting light from a confined core mode into a series of well-defined cladding modes that are sensitive to the refractive index of an adjacent fluid. Using the Cauchy integral method, we find the modes of a ridge waveguide refractometer. To gain good agreement with the experiment, the method requires us to take into account the dispersion and the 2-D geometry of the waveguide. The resulting modes are then used to predict the coupling dips in the reflection spectrum. Comparison with experimental measurements verifies the ability of this method to accurately determine the mode structure in the waveguide and, with minimal calibration, the refractive index of the adjacent fluid with error less than 2 x 10-4 riu.
waveguides, gratings, plasmonics, sensors
1943-0655
861-8871
Daly, Keith R.
64f85c2e-2562-44df-9cb8-1be7fbc7e74c
Holmes, Christopher
16306bb8-8a46-4fd7-bb19-a146758e5263
Gates, James C.
b71e31a1-8caa-477e-8556-b64f6cae0dc2
Smith, Peter G.R.
8979668a-8b7a-4838-9a74-1a7cfc6665f6
D'Alessandro, Giampaolo
bad097e1-9506-4b6e-aa56-3e67a526e83b
Daly, Keith R.
64f85c2e-2562-44df-9cb8-1be7fbc7e74c
Holmes, Christopher
16306bb8-8a46-4fd7-bb19-a146758e5263
Gates, James C.
b71e31a1-8caa-477e-8556-b64f6cae0dc2
Smith, Peter G.R.
8979668a-8b7a-4838-9a74-1a7cfc6665f6
D'Alessandro, Giampaolo
bad097e1-9506-4b6e-aa56-3e67a526e83b

Daly, Keith R., Holmes, Christopher, Gates, James C., Smith, Peter G.R. and D'Alessandro, Giampaolo (2011) Complete mode structure analysis of tilted Bragg grating refractometers in planar waveguides toward absolute index measurement. IEEE Photonics Journal, 3 (5), 861-8871. (doi:10.1109/JPHOT.2011.2168515).

Record type: Article

Abstract

Tilted Bragg grating refractometers are ideal devices for sensing applications. They work by diffracting light from a confined core mode into a series of well-defined cladding modes that are sensitive to the refractive index of an adjacent fluid. Using the Cauchy integral method, we find the modes of a ridge waveguide refractometer. To gain good agreement with the experiment, the method requires us to take into account the dispersion and the 2-D geometry of the waveguide. The resulting modes are then used to predict the coupling dips in the reflection spectrum. Comparison with experimental measurements verifies the ability of this method to accurately determine the mode structure in the waveguide and, with minimal calibration, the refractive index of the adjacent fluid with error less than 2 x 10-4 riu.

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e-pub ahead of print date: 19 September 2011
Published date: October 2011
Keywords: waveguides, gratings, plasmonics, sensors
Organisations: Optoelectronics Research Centre, Applied Mathematics

Identifiers

Local EPrints ID: 205565
URI: https://eprints.soton.ac.uk/id/eprint/205565
ISSN: 1943-0655
PURE UUID: b9315db6-fc5c-4625-be49-b93070648779
ORCID for James C. Gates: ORCID iD orcid.org/0000-0001-8671-5987
ORCID for Giampaolo D'Alessandro: ORCID iD orcid.org/0000-0001-9166-9356

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Date deposited: 12 Dec 2011 15:11
Last modified: 24 Aug 2019 00:37

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