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Results ■ Scientific Highlights ■ Nanoscale chemical mapping using 3D adiabatic compression of Surface Plasmon Polariton

Nanoscale chemical mapping using 3D adiabatic compression of Surface Plasmon Polariton

The fields of Plasmonics, Raman Spectroscopy, and Atomic Force Microscopy experienced a huge but independent development in the last decade. The potential progress derived by unifying these different techniques is of primary importance for obtaining simultaneous and complementary information at level of single molecule detection. We demonstrated that the convergence of those distant fields can open access to topographic, chemical and structural information on a spatial scale of few nanometers. The results were published in Nature Nanotechnology and the paper obtained the cover of January 2010, and a dedicated highlight. The work reported on the design, fabrication and measurements of a photonic-plasmonic device that is fully compatible with atomic force microscopy and Raman spectroscopy. By combining advanced fabrication methods we were able to fabricate three-dimensional nanostructures with a full control over geometries and optical properties. Imaging resolution (AFM topography) and chemical sensitivity (Raman analysis) with a spatial resolution up to 7 nm were demonstrated. The physical mechanism exploited is the generation of surface plasmon polaritons by means of a tapered nanostructure that causes Raman excitation through an adiabatic concentration of electromagnetic field in a spatial region of few nanometers at the tip apex.

 

Related IIT publications

  1. F. De Angelis et al., “Nanoscale chemical mapping using three-dimensional adiabatic compression of plasmon polariton”, Nature Nanotechnology 5, 67 - 72 (2010).
  2. F. De Angelis et al., “Emerging fabrication techniques for 3D nano-structuring in plasmonics and single molecule studies”, Nanoscale, 3, 2689-2696 (2011).

Last Updated on Friday, 13 April 2012 17:12

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