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Nanophotonic split-ring resonators as dichroics for molecular spectroscopy
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View: Figures


Image of FIG. 1.
FIG. 1.

Physical and plasmonic properties of a Ag split-ring resonator array. (a) High resolution SEM of radius, arc Ag split-rings arrayed with a periodicity of . (b) Local surface plasmon resonance of split-ring array for -field polarized perpendicular and parallel to split. resonance at and resonance at , encompassing common laser wavelengths of 633 and , respectively.

Image of FIG. 2.
FIG. 2.

Electromagnetic activity of multimodal ring structure. Electric field enhancement at second and third resonances for radius and arc Ag rings. FDTD simulations of normalized electric field at the surface of the ring.

Image of FIG. 3.
FIG. 3.

Sensing capability of both visible resonance modes. SERS spectra of a monolayer of 2-mercaptopyridine immobilized on a Ag split ring crescent array for e-field polarized both parallel (red) and perpendicular (black) to the split. The structures were excited with (a) a red HeNe laser (generating the plasmon mode) and (b) a laser (generating the plasmon mode). A different collection system was used for each laser. These results indicated average Raman enhancement factors for the entire structures of and for the and modes, respectively, whereas the enhancement predicted within the areas of highest electromagnetic activity with .


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Nanophotonic split-ring resonators as dichroics for molecular spectroscopy