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Sensors 2016, 16(10), 1643; doi:10.3390/s16101643

Rapid On-Site Formation of a Free-Standing Flexible Optical Link for Sensing Applications

1
Instituto de Sistemas Optoelectrónicos y Microtecnología (ISOM), ETSI Telecomunicación, Universidad Politécnica de Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain
2
Department of Photonics and Bioengineering, ETSI Telecomunicación, Universidad Politécnica de Madrid, Ciudad Universitaria s/n, 28040 Madrid, Spain
Received: 9 August 2016 / Accepted: 3 October 2016 / Published: 5 October 2016
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Spain 2016)
View Full-Text   |   Download PDF [3711 KB, uploaded 10 October 2016]   |  

Abstract

An optical link, based on a conventional Scotch tape waveguide, for sensing applications requiring rapid on-site assembly is proposed and demonstrated. The flexible waveguide contains an integrated aluminum one-dimensional grating coupler that, when stuck on the radiative surface of a light emitting device, allows light to be coupled in and transmitted through the tape, whose tip end is, in turn, adhered onto the photosensitive surface of a photodetector. The (de)coupling approaches exhibit high alignment tolerances that permit the formation of a free-standing flexible optical connection between surface-normal optoelectronic devices without the need of specialized equipment. As the first demonstration of a sensing application, the proposed optical link is easily configured as a cost-effective intensity-based refractometric sensor for liquid detection, which can be applicable to on-site quality and process control of, for example, beverages. View Full-Text
Keywords: optical sensors; micro-optical devices; plastic waveguides; diffraction gratings; guided waves; liquid detection; optical links optical sensors; micro-optical devices; plastic waveguides; diffraction gratings; guided waves; liquid detection; optical links
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Barrios, C.A. Rapid On-Site Formation of a Free-Standing Flexible Optical Link for Sensing Applications. Sensors 2016, 16, 1643.

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