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A Silicon-tipped Fiber-optic Sensing Platform with High Resolution and Fast Response
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Photonic crystal slab sensor with enhanced surface area.

Christopher Kang1, Christopher T Phare, Yurii A Vlasov

  • 1Interdisciplinary Graduate Program in Materials Science, Vanderbilt University, Nashville, Tennessee 37235, USA. chris.kang@vanderbilt.edu

Optics Express
|January 4, 2011
PubMed
Summary

Introducing multiple-hole defects (MHDs) in silicon photonic crystal cavities significantly boosts molecular detection sensitivity. This enhancement aids label-free biosensing by increasing surface area without compromising cavity performance.

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Area of Science:

  • Photonics
  • Nanotechnology
  • Materials Science

Background:

  • Photonic crystal cavities are crucial for sensitive detection.
  • Improving detection sensitivity without sacrificing quality factor is a key challenge.

Purpose of the Study:

  • To enhance molecular detection sensitivity in silicon slab photonic crystal cavities.
  • To investigate the impact of multiple-hole defects (MHDs) on cavity performance and sensitivity.

Main Methods:

  • Fabrication of silicon slab photonic crystal cavities with and without multiple-hole defects (MHDs).
  • Characterization of optical properties, including quality factor.
  • Measurement of detection sensitivity for small refractive index perturbations and bulk refractive index changes.

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Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation
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Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation

Published on: September 27, 2011

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Last Updated: Jun 5, 2026

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09:29

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Main Results:

  • Multiple-hole defects (MHDs) increased the surface area for label-free detection.
  • A 44% increase in detection sensitivity for surface monolayer attachment was observed with MHDs compared to L3 defects.
  • An 18% higher detection sensitivity for bulk refractive index changes was achieved using MHDs.

Conclusions:

  • MHDs offer a viable strategy to enhance molecular detection sensitivity in silicon photonic crystal cavities.
  • This approach improves label-free sensing capabilities without negatively impacting the quality factor.
  • The findings are relevant for advancing biosensing and chemical detection technologies.