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内蒙古自治区呼和浩特市赛罕区大学西街235号 邮编: 010021
作者机构:Consejo Super Invest Cientificas Inst Estruct Mat Madrid 28006 Spain
出 版 物:《OPTICS LETTERS》 (光学快报)
年 卷 期:2007年第32卷第16期
页 面:2330-2332页
核心收录:
学科分类:070207[理学-光学] 07[理学] 08[工学] 0803[工学-光学工程] 0702[理学-物理学]
主 题:Distributed feedback Electric fields Evanescent wave coupling Polaritons Surface plasmon polaritons Transmission coefficient
摘 要:The existence of gap states within the first stop band is theoretically investigated for surface-plasmon polaritons propagating along metal surfaces structured with finite arrays of nano-grooves/ridges with imperfections. By means of rigorous calculations of all scattering channels on the basis of the reduced Rayleigh equation, it is shown that a mismatch of the grating period, rather than simple vacant/defect sites, favors the opening of gap states (located at midgap for half-period shifts) as a phase step does in distributed feedback gratings. Quality factors of the resulting surface-plasmon polaritons resonances a re limited by radiative leakage and ohmic losses. (C) 2007 Optical Society of America.