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Fig. 2 | Nano Convergence

Fig. 2

From: Nanostructured plasmonic substrates for use as SERS sensors

Fig. 2

b Reproduced with permission from Ref. [22], © 2003, American Chemical Society. ce Reproduced with permission from Ref. [23], © 1996, American Physical Society

Principle underlying the localized surface plasmon resonance (LSPR) phenomenon and the enhancement in the electric field generated by an LSPR. a Electromagnetic field interactions with a metal nanoparticle. b Simulation of the electric field distribution near a spherical metal nanoparticle. c Optical models of rough metal surfaces prepared with different metal gap sizes (d corresponds to the distance between two cylinders, and R is the radius of the metal cylinder). d Calculated electric field enhancements obtained from different spacings, using the geometry in (c). e Divergence of the electric field at the sample for 2R = d, from an incident beam at 2.7 eV.

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