Enhancing absorption and sensitivity within structured optical fibres

John Canning; Whayne Padden; Danijel Boskovic; Masood Naqshbandi; Lorenzo Costanzo; George Huyang; Hank de Bruyn; Tze Han Sum; Maxwell J. Crossley

doi:10.1117/12.866241

8 September 2010 Enhancing absorption and sensitivity within structured optical fibres

John Canning, Whayne Padden, Danijel Boskovic, Masood Naqshbandi, Lorenzo Costanzo, George Huyang, Hank de Bruyn, Tze Han Sum, Maxwell J. Crossley

Author Affiliations +

Proceedings Volume 7653, Fourth European Workshop on Optical Fibre Sensors; 76532B (2010) https://doi.org/10.1117/12.866241
Event: (EWOFS'10) Fourth European Workshop on Optical Fibre Sensors, 2010, Porto, Portugal

Abstract

We propose enhancing the absorption of a species inside the channels of a structured optical fibre by depositing a high index layer within the air holes. This layer draws out the optical field within the mode increasing the overlap interaction. Simulations support the general idea and an experimental demonstration is reported using a novel approach to film formation with TiO₂ nanoparticles. For the sake of demonstration, we use porphyrin with carboxylic groups that attach to the TiO₂. The deposition of particles well coated with porphyrin is compared to those not fully coated prior to deposition in the holes. The latter case is found to give the best results since scattering loss is reduced when the porphyrins are not initially attached to the TiO2 particle. This is expected if film formation through intermolecular forces has occurred.rs.

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John Canning, Whayne Padden, Danijel Boskovic, Masood Naqshbandi, Lorenzo Costanzo, George Huyang, Hank de Bruyn, Tze Han Sum, and Maxwell J. Crossley "Enhancing absorption and sensitivity within structured optical fibres", Proc. SPIE 7653, Fourth European Workshop on Optical Fibre Sensors, 76532B (8 September 2010); https://doi.org/10.1117/12.866241

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KEYWORDS

Particles

Titanium dioxide

Structured optical fibers

Absorption

Scattering

Mie scattering

Silica

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