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

Jhonattan C Ramirez1, Lucas H Gabrielli2, Laura M Lechuga3

  • 1Department of Electronic Engineering, School of Engineering, Federal University of Minas Gerais (UFMG), Belo Horizonte 31270-901, MG, Brazil. jcordoba@cpdee.ufmg.br.

Sensors (Basel, Switzerland)
|June 27, 2019
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Summary
This summary is machine-generated.

This study demonstrates a novel optical waveguide sensor for sensitive temperature detection. The interferometric transducer utilizes multi-mode interference for enhanced performance in sensing applications.

Keywords:
direct laser writer fabricationintegrated opticsmodal interferometerpolymer waveguidesensor

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Area of Science:

  • Photonics
  • Optical Sensing
  • Waveguide Technology

Background:

  • Interferometric transducers offer high sensitivity for various sensing applications.
  • Optical waveguides provide a platform for compact and integrated photonic devices.

Purpose of the Study:

  • To implement and demonstrate an interferometric transducer utilizing a trimodal optical waveguide.
  • To investigate the sensitivity of the device to temperature variations.

Main Methods:

  • Fabrication of a straight polymer waveguide using SU-8 over a SiO2 substrate.
  • Generation of readout signal via interference between fundamental and second-order modes.
  • Characterization of the device's free spectral range and signal visibility.

Main Results:

  • The trimodal optical waveguide interferometer achieved a free spectral range of 20.2 nm.
  • A signal visibility of 5.7 dB was recorded.
  • The device demonstrated a temperature sensitivity of 0.0586 dB/°C.

Conclusions:

  • The proposed interferometric transducer is a promising candidate for highly sensitive, compact, and low-cost photonic sensing.
  • The technology is suitable for diverse sensing applications, including point-of-care diagnostics.