naa a22 4500 510816029 CHVBK 20180411083508.0 cr unu---uuuuu 180411e20130901xx s 000 0 eng 10.1007/s11468-013-9554-6 doi (NATIONALLICENCE)springer-10.1007/s11468-013-9554-6 Imaging and Characterizing Long-Range Surface Plasmon Polaritons Propagating in a Submillimeter Scale by Two-Color Two-Photon Photoelectron Emission Microscopy [Elektronische Daten] [Masahiro Shibuta, Toyoaki Eguchi, Atsushi Nakajima] Long-range surface plasmon polaritons (SPPs), which propagate along metal/dielectric interfaces to submillimeter distances in the range of near-infrared (NIR) excitation wavelength, were examined by two-color two-photon photoelectron emission microscopy (2P-PEEM). Interferences between incident NIR photons and SPPs excited by the NIR photons at surface defects were imaged by detecting photoelectrons emitted from a gold surface, assisted by simultaneously irradiated ultraviolet photons which are to overcome the workfunction of the surface. The wavelength of the interference beat depends sensitively on the NIR wavelength. By analyzing the interference beat, the dispersion curve as well as phase and group velocities of SPP's were experimentally obtained. The results closely match the theoretical one based on the Drude free electron model, indicating that two-color 2P-PEEM is applicable not only to the visualization of NIR-excited SPPs but also to the quantitative analysis of its physical properties. This method will be widely used to observe SPPs for various artificial plasmonic devices. Springer Science+Business Media New York, 2013 Surface plasmon polaritons nationallicence Photoelectron emission microscope nationallicence Two-photon photoemission nationallicence Interference beat nationallicence Shibuta Masahiro JST, ERATO, Nakajima Designer Nanocluster Assembly Project, 3-2-1 Sakado, Takatsu-ku, 213-0012, Kawasaki, Japan aut Eguchi Toyoaki JST, ERATO, Nakajima Designer Nanocluster Assembly Project, 3-2-1 Sakado, Takatsu-ku, 213-0012, Kawasaki, Japan aut Nakajima Atsushi JST, ERATO, Nakajima Designer Nanocluster Assembly Project, 3-2-1 Sakado, Takatsu-ku, 213-0012, Kawasaki, Japan aut Plasmonics Springer US; http://www.springer-ny.com 8/3(2013-09-01), 1411-1415 1557-1955 8:3<1411 2013 8 11468 https://doi.org/10.1007/s11468-013-9554-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s11468-013-9554-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Shibuta Masahiro JST, ERATO, Nakajima Designer Nanocluster Assembly Project, 3-2-1 Sakado, Takatsu-ku, 213-0012, Kawasaki, Japan aut NATIONALLICENCE 700 1- Eguchi Toyoaki JST, ERATO, Nakajima Designer Nanocluster Assembly Project, 3-2-1 Sakado, Takatsu-ku, 213-0012, Kawasaki, Japan aut NATIONALLICENCE 700 1- Nakajima Atsushi JST, ERATO, Nakajima Designer Nanocluster Assembly Project, 3-2-1 Sakado, Takatsu-ku, 213-0012, Kawasaki, Japan aut NATIONALLICENCE 773 0- Plasmonics Springer US; http://www.springer-ny.com 8/3(2013-09-01), 1411-1415 1557-1955 8:3<1411 2013 8 11468 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer