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Metal nano-void photonic crystal for enhanced raman spectroscopy

  • US 20060119853A1
  • Filed: 11/04/2005
  • Published: 06/08/2006
  • Est. Priority Date: 11/04/2004
  • Status: Active Grant
First Claim
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1. A planar optical platform for generating a Raman signal from a foreign object, comprising:

  • an input region for receiving optical radiation;

    a plasmonic band structure region optically coupled to the input region, the plasmonic band structure region comprising a layer of a first material patterned with an array of sub-regions of a second material, the first material having a first refractive index and the second material having a second refractive index, a side-wall of each sub-region being coated with a metallic or metallodielectric layer, wherein the array of sub-regions give rise to a plasmonic band structure, and wherein, in use, each sub-region confines a plasmon resonance excited by optical radiation coupled into the plasmonic band structure region which gives rise to a Raman signal from a foreign object placed proximate the plasmonic band structure region; and

    an output region for extracting optical radiation, the output region optically coupled to the plasmonic band structure region.

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