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(a) Scanning electron micrographs of as-prepared single-crystalline gold platelets showing typical size, geometry, and thickness; (b) illumination scheme in the emission microscope showing sample structure and orientation.
(a) False color composite image of two PEEM micrographs taken with +45° and −45° polarizations; green brightness represents electron emission rate obtained for +45° polarization, red brightness represents electron emission obtained for −45° polarization. (b) Details of a structure from part (a). (c) Emission rate distribution for −45° polarization (left) and +45° polarization (right).
(a) Eleven routers carved from a triangular gold platelet. Composite PEEM images obtained with dc-illumination at 244 nm from a frequency-doubled Ar+ laser (gray scale) and pulse illumination at 780 nm (color). Electron emission for −45° polarization is represented in red, for +45° electron emission is in green. Hot spots at the end points of the Y structure are clearly seen indicating polarization-selective emission from ITO. No emission from the front edge or the surface of the Y-structure is seen. (b) Digital plot of the emission rate for −45° degree polarization. This image is obtained with simultaneous illumination from a Hg lamp to provide the contour of the Y structure, and laser pulses at 780 nm for the plasmon excitation. When the emission from the Hg lamp is taken into account, the brightness ratio between the right and left-hand tips of the Y is found to be >10.
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