Theoretical and experimental investigation of strongly localized plasmons on triangular metal wedges for subwavelength waveguiding

D. F. P. Pile, T. Ogawa, D. K. Gramotnev, T. Okamoto, M. Haraguchi, M. Fukui, S. Matsuo
2005 Applied Physics Letters  
We report numerical analysis and experimental observation of strongly localized plasmons guided by a triangular metal wedge. Dispersion and dissipation of such wedge plasmons are analyzed using the finite-difference time-domain algorithm. Experimental observation is conducted by the end-fire excitation and near-field detection of the predicted plasmons on a 40 o silver nano-wedge. Good agreement with the theoretically predicted propagation distances is demonstrated. Differences between the
more » ... es between the theoretical and experimental field distribution are explained by insufficient resolution of the nearfield optical probe.
doi:10.1063/1.1991990 fatcat:gyymofpl2vezxcikajmgcljceq