Optical Properties of Sub-Wavelength Dielectric Gratings and Their Application for Surface Enhanced Raman Scattering

Abstract

We fabricated and measured the far-field optical properties of a sub-wavelength Si3N4 (silicon nitride) two dimensional grating. Frequency-dependent transmission measurements from a white-light source revealed that both transverse magnetic (TM) and transverse electric (TE) modes were excited on the grating. We determined the dispersion relations of the modes by tilting the sample with respect to the incoming light beam and measuring the frequency shift of the absorption features. By comparing to a simple model, we determined the effective refractive index for the TM and TE modes and the geometrical constants for the grating. This information enables gratings with desired optical properties to be designed and fabricated. The application of the sub-wavelength grating for surface enhanced Raman scattering (SERS) is demonstrated.

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Document Details

Document Type
Technical Report
Publication Date
Feb 01, 2011
Accession Number
ADA549452

Entities

People

  • David Fattal
  • Jingjing Li
  • Min Hu
  • Stanley R. Williams
  • Xuema Li
  • Zhiyong Li

Organizations

  • Hp

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Ceramic Materials
  • Dispersion Relations
  • Electron Beam Lithography
  • Far Field
  • Frequency
  • Frequency Shift
  • Geometry
  • Lasers
  • Light Sources
  • Measurement
  • Optical Properties
  • Raman Scattering
  • Raman Spectroscopy
  • Refractive Index
  • Scattering
  • Surface Plasmon Resonance
  • Two Dimensional

Fields of Study

  • Physics

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Nanoscale Plasmonic Nanotechnology
  • Optical Physics and Photonics.