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Related Experiment Video

Updated: Jul 2, 2026

Use of Label-free Optical Biosensors to Detect Modulation of Potassium Channels by G-protein Coupled Receptors
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Published on: February 10, 2014

Sensitive label-free biosensing using critical modes in aperiodic photonic structures.

Svetlana V Boriskina1, Luca Dal Negro

  • 1Department of Electrical and Computer Engineering, Boston University, Boston, MA 20036, USA. sboriskina@gmail.com

Optics Express
|August 20, 2008
PubMed
Summary

This study introduces novel optical sensing using Rudin-Shapiro (RS) sequences. These aperiodic structures offer enhanced sensitivity for label-free optical biosensors.

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Last Updated: Jul 2, 2026

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Area of Science:

  • Photonics and Optical Sensing
  • Materials Science
  • Nanotechnology

Background:

  • Traditional periodic photonic structures have limitations in sensing applications.
  • Localized modes in periodic structures are less efficient for high-sensitivity detection.
  • Aperiodic structures offer potential for novel optical functionalities.

Purpose of the Study:

  • To introduce a novel optical sensing approach using critically localized modes in Rudin-Shapiro (RS) sequences.
  • To demonstrate the superiority of RS structures over traditional periodic photonic structures for sensing.
  • To enable the development of advanced label-free optical biosensors.

Main Methods:

  • Computational analysis of two-dimensional deterministic aperiodic structures.
  • Excitation and characterization of critically localized modes.
  • Simulation of refractive index variations and sensitivity analysis.

Main Results:

  • RS photonic structures exhibit a large number of resonant modes suitable for sensing.
  • RS structures show enhanced sensitivity to refractive index changes as low as (delta)n=0.002.
  • Critically localized modes in RS structures are responsible for the enhanced sensitivity.

Conclusions:

  • Rudin-Shapiro sequences provide a promising platform for high-sensitivity optical sensing.
  • The extended nature of critical modes in RS structures enhances sensor performance.
  • This approach can lead to the fabrication of novel label-free optical biosensors.