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Detection of single nano-defects in photonic crystals between crossed polarizers

Abstract

We investigate, by simulations and experiments, the light scattering of small particles trapped in photonic crystal membranes supporting guided resonance modes. Our results show that, due to amplified Rayleigh small particle scattering, such membranes can be utilized to make a sensor that can detect single nano-particles. We have designed a biomolecule sensor that uses cross-polarized excitation and detection for increased sensitivity. Estimated using Rayleigh scattering theory and simulation results, the current fabricated sensor has a detection limit of 26 nm, corresponding to the size of a single virus. The sensor can potentially be made both cheap and compact, to facilitate use at point-of-care.

Category

Academic article

Language

English

Author(s)

  • Jon Olav Grepstad
  • Peter Kaspar
  • Ib-Rune Johansen
  • Olav Solgaard
  • Aasmund Sudbø

Affiliation

  • Norwegian University of Science and Technology
  • CEA-Leti
  • SINTEF Digital / Microsystems and Nanotechnology
  • Stanford University
  • University of Oslo

Year

2013

Published in

Optics Express

ISSN

1094-4087

Publisher

Optical Society of America

Volume

21

Issue

25

Page(s)

31375 - 31389

View this publication at Cristin