Spps mode converter based on asymmetric nano-trench structure and its conversion method
A mode converter and mode conversion technology, applied in the field of nanophotonics, can solve problems such as increasing difficulty, achieve high-efficiency excitation, and be conducive to high integration.
Inactive Publication Date: 2017-09-29
PEKING UNIV
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Problems solved by technology
Using a complex excitation field distribution and improving the matching degree between the excitation field and the mode field distribution of the second-order waveguide mode can improve the excitation efficiency of the second-order waveguide mode to a certain extent, but the complex excitation field distribution means that the experiment is very difficult Increase
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[0021] The present invention will be further described through the embodiments below in conjunction with the accompanying drawings.
[0022] Such as figure 1 As shown, the surface plasmon mode converter based on the asymmetric nano-groove structure of this embodiment includes: a metal film; a wide main nano-groove is arranged on the surface of the metal film; The side is provided with a narrow additional nano-groove, forming an asymmetric nano-groove structure. The widths of the main nanotrench and the additional nanotrench are w 1 and w 2 , the depth is h 1 and h 2 . λ is the incident wavelength, w 1 Between 0.4λ~0.9λ, to ensure that only the first-order waveguide mode 1st and the second-order waveguide mode 2nd are propagation modes in the main nanogroove at the incident wavelength; w 2 between 0.05λ and 0.3λ, to ensure that only the first-order waveguide mode 1'st is the propagating mode in the additional nanogroove at the incident wavelength.
[0023] The metal thi...
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The invention discloses an SPPs mode converter and conversion method based on an asymmetric nanoscale groove structure. The surface plasmon polaritons (SPPs) mode converter comprises a metal film, a main nanoscale groove is formed in the surface of the metal film, an auxiliary nanoscale groove is formed in the one side of the bottom of the main nanoscale groove to form the asymmetric nanoscale groove structure, interconversion coefficients of a first-order waveguide mode and a second-order waveguide mode in the main nanoscale groove are controlled by controlling the depth of the auxiliary nanoscale groove of the resonant structure, and therefore efficient and controllable conversion of surface plasmon polaritons of different modes is achieved; the efficiency of mode conversion can reach up to 90%. The total electromagnetic field distribution is more convenient to control through interference between the first-order waveguide mode and the second-order waveguide mode, meanwhile, the SPPs mode converter has the super-small size of a few hundreds of nanometers, high integration is facilitated, and therefore the SPPs mode converter is widely applied in an SPPs photonic circuit of the ultra-high integration level.
Description
technical field [0001] The invention relates to the field of nanophotonics, in particular to a high-efficiency surface plasmon mode converter based on an asymmetric nano-groove structure and a conversion method thereof. Background technique [0002] Surface plasmon polaritons (Surface Plasmon Polaritons) SPPs are currently a hot spot in nanophotonics research. The surface plasmon is a collective oscillation that exists at the interface between the metal and the medium coupled with the light wave and the free electrons in the metal. It is a special electromagnetic field in the interface bound mode. Its existence can be solved by solving the interface between the metal and the medium. It is obtained from Maxwell's equations under the boundary conditions. The biggest feature of SPPs is that they can localize the light field within the sub-wavelength size at the interface between the metal and the medium, breaking through the diffraction limit of traditional optics. At the same...
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IPC IPC(8): G02B6/14G02B6/122
CPCG02B6/122G02B6/14
Inventor 李智廖慧敏姚文杰刘尚孙成伟陈建军龚旗煌
Owner PEKING UNIV