Straightforward nano patterning on optical fiber for sensors development

A simple method to prepare a nano pattern along the surface of an optical fiber is applied in this Letter to develop a pH sensor. The template is made of a block copolymer that defines specific locations where gold nano particles are adsorbed on forming clusters. The average diameter of the resultin...

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Bibliographic Details
Published in:Optics letters 2020-07, Vol.45 (14), p.3877-3880
Main Authors: De Acha, Nerea, Elía, Víctor, Delgado-Camón, Arantzazu, Arregui, Francisco J., Elosúa, César
Format: Article
Language:English
Subjects:
Agglomerates
Block copolymers
Gold
Morphology
Nanoparticles
Optical fibers
Patterning
Sensors
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Summary:A simple method to prepare a nano pattern along the surface of an optical fiber is applied in this Letter to develop a pH sensor. The template is made of a block copolymer that defines specific locations where gold nano particles are adsorbed on forming clusters. The average diameter of the resulting agglomerates is 121 nm, and the mean distance between the centers is 182 nm. The morphology of the gold cluster array produces localized surface plasmon resonance. The absorbance spectrum is affected by pH variations, and the ratio between the absorption at two different wavelengths is used to characterize the response, which is repetitive and reversible. This Letter highlights the potentiality of this type of chemical nano patterning for the development of optical fiber sensors.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.397817