Splitting the surface wave in metal/dielectric nanostructures

doi:10.1088/1674-1056/20/6/067901

中国物理B ›› 2011, Vol. 20 ›› Issue (6): 67901-067901.doi: 10.1088/1674-1056/20/6/067901

Splitting the surface wave in metal/dielectric nanostructures

祝颂, 吴坚

Department of Physics, State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai 200240, China

收稿日期:2010-09-03 修回日期:2010-11-17 出版日期:2011-06-15 发布日期:2011-06-15

Splitting the surface wave in metal/dielectric nanostructures

Zhu Song(祝颂)^†, Wu Jian(吴坚)

Department of Physics, State Key Laboratory of Advanced Optical Communication Systems and Networks, Shanghai Jiao Tong University, Shanghai 200240, China

Received:2010-09-03 Revised:2010-11-17 Online:2011-06-15 Published:2011-06-15

摘要/Abstract

摘要： We investigate a modified surface wave splitter with a double-layer structure, which consists of symmetrical metallic grating and an asymmetrical dielectric, using the finite-difference time-domain (FDTD) simulation method. The metal/dielectric interface structure at this two-side aperture can support bound waves of different wavelengths, thus guiding waves in opposite directions. The covered dielectric films play an important role in the enhancement and confinement of the diffraction wave by the waveguide modes. The simulation result shows that the optical intensities of the guided surface wave at wavelengths of 760-nm and 1000-nm are about 100 times and 4～5 times those of the weaker side, respectively, which means that the surface wave is split by the proposed device.

关键词: surface plasmons, finite-difference time-domain method, metallic grating, layered nanostructures

Abstract: We investigate a modified surface wave splitter with a double-layer structure, which consists of symmetrical metallic grating and an asymmetrical dielectric, using the finite-difference time-domain (FDTD) simulation method. The metal/dielectric interface structure at this two-side aperture can support bound waves of different wavelengths, thus guiding waves in opposite directions. The covered dielectric films play an important role in the enhancement and confinement of the diffraction wave by the waveguide modes. The simulation result shows that the optical intensities of the guided surface wave at wavelengths of 760-nm and 1000-nm are about 100 times and 4～5 times those of the weaker side, respectively, which means that the surface wave is split by the proposed device.

Key words: surface plasmons, finite-difference time-domain method, metallic grating, layered nanostructures

中图分类号: (Interfaces; heterostructures; nanostructures)

79.60.Jv

91.30.Fn (Surface waves and free oscillations) 02.60.Cb (Numerical simulation; solution of equations)

祝颂, 吴坚. Splitting the surface wave in metal/dielectric nanostructures[J]. 中国物理B, 2011, 20(6): 67901-067901.

Zhu Song(祝颂), Wu Jian(吴坚). Splitting the surface wave in metal/dielectric nanostructures[J]. Chin. Phys. B, 2011, 20(6): 67901-067901.

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Splitting the surface wave in metal/dielectric nanostructures

Splitting the surface wave in metal/dielectric nanostructures

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