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Open AccessArticle

Trimodal Waveguide Demonstration and Its Implementation as a High Order Mode Interferometer for Sensing Application

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Department of Electronic Engineering, School of Engineering, Federal University of Minas Gerais (UFMG), Belo Horizonte 31270-901, MG, Brazil
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School of Electrical and Computer Engineering (FEEC), University of Campinas (UNICAMP), Campinas 13083-852, SP, Brazil
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Nanobiosensors and Bioanalytical Group, Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC, BISTCIBER-BBN, 08193 Bellaterra (Barcelona), Spain
*
Author to whom correspondence should be addressed.
Sensors 2019, 19(12), 2821; https://doi.org/10.3390/s19122821
Received: 30 April 2019 / Revised: 5 June 2019 / Accepted: 5 June 2019 / Published: 24 June 2019
(This article belongs to the Section Optical Sensors)
This work implements and demonstrates an interferometric transducer based on a trimodal optical waveguide concept. The readout signal is generated from the interference between the fundamental and second-order modes propagating on a straight polymer waveguide. Intuitively, the higher the mode order, the larger the fraction of power (evanescent field) propagating outside the waveguide core, hence the higher the sensitivity that can be achieved when interfering against the strongly confined fundamental mode. The device is fabricated using the polymer SU-8 over a SiO2 substrate and shows a free spectral range of 20.2 nm and signal visibility of 5.7 dB, reaching a sensitivity to temperature variations of 0.0586 dB/°C. The results indicate that the proposed interferometer is a promising candidate for highly sensitive, compact and low-cost photonic transducer for implementation in different types of sensing applications, among these, point-of-care. View Full-Text
Keywords: integrated optics; modal interferometer; sensor; polymer waveguide; direct laser writer fabrication integrated optics; modal interferometer; sensor; polymer waveguide; direct laser writer fabrication
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MDPI and ACS Style

Ramirez, J.C.; Gabrielli, L.H.; Lechuga, L.M.; Hernandez-Figueroa, H.E. Trimodal Waveguide Demonstration and Its Implementation as a High Order Mode Interferometer for Sensing Application. Sensors 2019, 19, 2821.

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