Distributed feedback gratings for surface-plasmon polaritons based on metal nano-groove/ridge arrays

作     者：Sanchez-Gil, Jose A. 

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.