Metal-medium coupling resonance cavity for generating Vaino resonance phenomenon

A technology of coupled resonance and resonant cavity, which is applied in the field of nanophotonics, can solve problems such as limiting the application of surface plasmon functional devices, and achieve the effect of increasing wavelength resolution and reducing threshold

Inactive Publication Date: 2013-02-13
BEIJING UNIV OF POSTS & TELECOMM
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Problems solved by technology

In order to obtain photonic devices such as high-contrast modulation, wavelength filtering, beam splitting, and wavelength division multiplexing, the wavelengt

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  • Metal-medium coupling resonance cavity for generating Vaino resonance phenomenon
  • Metal-medium coupling resonance cavity for generating Vaino resonance phenomenon

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[0017] The present invention will be further described through the embodiments below in conjunction with the accompanying drawings.

[0018] like figure 1 As shown, the metal-dielectric coupled resonator that produces the Fano resonance phenomenon of the present invention includes: a metal-dielectric-metal MIM waveguide, and a branch resonator 4 and two baffles 5 in the MIM waveguide; wherein, the MIM waveguide is Three-layer flat plate structure, the first layer 1 and the third layer 3 are metal materials, and the dielectric layer 2 is in between; the branch resonator 4 is coupled to the dielectric layer 2 of the metal-medium-metal MIM waveguide from the side; two barriers The plate 5 is vertically arranged in the dielectric layer 2, and is respectively located on both sides of the branch resonator 4; the branch resonator 4 and the dielectric layer 2 are the same medium; it is a two-dimensional structure.

[0019] In this embodiment, the metal of the first layer 1 and the th...

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Abstract

The invention discloses a metal-medium coupling resonance cavity for generating a Vaino resonance phenomenon. A branch resonance cavity in an MIM (metal-insulator-metal) waveguide and coupling resonance cavities of two baffles are adopted, and different resonance cavities are coupled to generate a steep asymmetric response spectrum line shape, so that the Vaino resonance phenomenon is obtained. In a transmittance spectrum, transmittance can quickly ascend from a valley to a peak of an asymmetric spectrum, so that under the condition that same switching contrast is obtained, required wavelength shift or interval is smaller than spectrum width of a symmetric similar Lorentzian line shape generated in a single resonance cavity, thereby being favorable for reducing a threshold value of a pump energy of a surface plasmon modulator or increasing a wavelength resolution rate of a surface plasmon wavelength division multiplexer and improving sensitivity of a biosensor. Therefore, the metal-medium coupling resonance cavity has very important application in fields of the surface plasmon modulator, a beam splitter, the wavelength division multiplexer and the sensor and the like.

Description

technical field [0001] The invention relates to the field of nanophotonics, in particular to a metal-medium coupled resonant cavity that produces the Fano resonance phenomenon. Background technique [0002] Surface plasmon polaritons (Surface Plasmon Polaritons) SPPs are currently a hot spot in nanophotonics research. Surface plasmon is a collective oscillation that exists at the interface between a metal and a medium coupled with a light wave and free electrons in the metal. It is a special interface bound mode electromagnetic field, which can be solved by solving the boundary conditions at the metal-medium interface From the following Maxwell's equations. The biggest feature of SPPs is that it can localize the light field within the sub-wavelength size at the interface between the metal and the medium, which can break through the diffraction limit of traditional optics, and also has a localized field enhancement effect. Therefore, SPPs have received extensive attention f...

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Application Information

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IPC IPC(8): G02B6/122
Inventor 陈建军李智张茹肖井华
Owner BEIJING UNIV OF POSTS & TELECOMM
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