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Kim, D. S.,Yoon, Y. C.,Hohng, S. C.,Malyarchuk, V.,Lienau, Ch.,Park, J. W.,Kim, J. H.,Park, Q. H. Optical Society of Korea 2002 Current Optics and Photonics Vol.6 No.3
Nanoscopic emission from periodic nano-hole arrays in thick metal films is studied experimentally. The experiments give direct evidence for SP excitations in such structures. We show that the symmetry of the emission is governed by polarization and its shape is defined the interference of SP waves of different diffraction orders. Near-Held pattern analysis combined with the far-Held reflection and transmission measurements suggests that the SP eigenmodes of these arrays may be understood as those of ionic plasmon molecules.
홍성철,박규환,Ch. Lienau,김대식,J. Kim,J. W. Park,K. H. Yoo,. H. Han,V. Malyarchuk,Y. C. Yoon 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.46 No.2
We study emission patterns in periodic nano-hole arrays perforated in a metal film. In the nearfield region, higher order multiple components of diffraction interfere with each other to generate complicated spatial patterns. These patterns simplify to a sinusoidal one in the intermediate region and become either homogeneous or sinusoidal in the far-field region, depending on whether the excitation wavelength is larger or smaller than the lattice constant. For an incident wavelength much smaller than the lattice constant, complicated patterns can survive into the far-field. Detailed analytic and numerical studies are presented, which show good qualitative agreement with experiment.