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Scheme 1 | Nanoscale Research Letters

Scheme 1

From: Mapping the Polarization Pattern of Plasmon Modes Reveals Nanoparticle Symmetry

Scheme 1

(a) Schematics of the RotPOL setup. One wavelength is selected by a linear variable interference filter (varIF), and then the light is dispersed into different polarization directions by a wedge-shaped rotating polarizer (PL), resulting in ring-shaped intensity profiles of a point-like light source on the digital camera (b). In order to get the polarization profile shown in (c) (intensityI(q) as a function of polarization angle q), we integrate the image between an inner and an outer ring diameter (dashed lines in (b)). The center of the rings is chosen to minimize asymmetry between opposite sides. Repeating this procedure for each wavelength produces intensity values as a function of wavelength and polarization angleI(l,q), which we show color-coded in (d). The same analysis is possible for all particles within the field of view in parallel. (e) Real-color image of an inhomogeneous silver sample containing spheres, rods, and triangles as seen through the RotPol-microscope. Two colors in one ring correspond to two different plasmon modes at the respective wavelengths. Scalebar is 25 μm

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