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Polymer Ring Resonator with a Partially Tapered Waveguide for Biomedical Sensing: Computational Study.

Tayebeh Sahraeibelverdi1,2, L Jay Guo1, Hadi Veladi2

  • 1Electrical and Computer Engineering Department, University of Michigan, Ann Arbor, MI 48109, USA.

Sensors (Basel, Switzerland)
|August 10, 2021
PubMed
Summary

This study enhances polymer ring resonators for biosensing by using partially tapered waveguides. This design significantly boosts sensitivity and figure of merit for improved biomedical sensing applications.

Keywords:
micro-optical devicesoptical sensorspolymer waveguide devicesrefractive index sensorsensors

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Area of Science:

  • Photonics and Materials Science
  • Biomedical Engineering and Sensor Technology

Background:

  • Ring resonators are established optical biosensors, valued for high Q-factor, sensitivity, and miniaturization potential.
  • Existing designs offer good performance but have room for improvement in sensitivity and figure of merit for advanced biomedical sensing.

Purpose of the Study:

  • To investigate the characteristics of a polymer ring resonator with a partially tapered waveguide for enhanced biomedical sensing.
  • To develop a more sensitive biosensor with an improved figure of merit through increased field interaction in tapered segments.

Main Methods:

  • Investigated polymer ring resonators with gradually reduced waveguide width (to half) in partially tapered segments.
  • Analyzed sensitivity, Q-factor, and figure of merit variations with different numbers and angles of tapered sections.
  • Compared performance of strip waveguides versus partially tapered waveguides (e.g., π/4 taper).

Main Results:

  • Sensitivity increased from 84.6 to 101.74 [nm/RIU] with a π/4 partially tapered waveguide.
  • Q-factor saw a minor reduction from 4.60 × 10³ to 4.36 × 10³.
  • Figure of merit improved from 497 to 565 with approximately six π/4 tapered sections.
  • A three-tapered design is suggested for optimal balance between performance and fabrication.

Conclusions:

  • Partially tapered waveguides in polymer ring resonators significantly enhance biosensor sensitivity and figure of merit.
  • The all-polymer device offers a low-cost, disposable solution compatible with roll-to-roll fabrication.
  • This design is adaptable to silicon on isolator or polymer on silicon platforms for potentially higher Q-factors and sensitivity.