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Surface plasmon lens integrated with metal nano-cavity

A surface plasmon and metal nanotechnology, applied in the field of nanophotonics, can solve problems that are not easy to realize and limit practical applications, and achieve the effects of easy processing, easy use, and high-quality preparation

Inactive Publication Date: 2012-10-03
PEKING UNIV
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  • Claims
  • Application Information

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Embodiment Construction

[0024] In the following, the present invention will be further explained through examples in conjunction with the drawings.

[0025] The surface plasmon lens of the integrated metal nanocavity of the present invention includes: a substrate 1, a gold film 2, a nano-slit ring 3 and a metal nanocavity 4; wherein the gold film 2 is plated on the upper surface of the substrate 1; The nano slit ring 3 is located on the gold film 2 and penetrates the gold film; and the metal nano cavity is a rectangular shallow groove located in the center of the nano slit ring, such as figure 2 Shown. The substrate uses optical glass.

[0026] Incident wavelength λ 0 Take 830nm, the corresponding refractive index of gold is 0.08+5i. The inner diameter D and the width w of the nano slit ring are 5m and 100nm, respectively. The thickness T of the gold film is selected as 750nm, so that the thickness of the remaining gold film from the bottom of the metal nanocavity to the upper surface of the substrate ...

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Abstract

The invention discloses a surface plasmon lens integrated with a metal nano-cavity. The surface plasmon lens comprises a substrate, a gold film, a nano-seam circular ring and a metal nano-cavity, wherein the gold film is plated on the upper surface of the substrate; the nano-seam circular ring is positioned on the gold film, and passes through the gold film; the metal nano-cavity is a rectangular hollow groove, is positioned in the center of the nano-seam circular ring, and is etched in the gold film to a certain depth from the upper surface of the gold film without being etched completely. In the surface plasmon lens, a light field can be localized into a light spot which is 6.0*10<-3>lambda0<2> (lambda0 is the free space wavelength of incident light) under the condition of resonance of the metal nano-cavity, and the light intensity of a lens center is increased by 5,500 times than a cavity-free situation simultaneously. The use of radial polarized light in a light source is avoided, accurate alignment of a light beam center and the lens center is not required, the application range is larger, and the greater convenience is brought to use. Moreover, the surface plasmon lens is convenient to process, and is easy for high-quality preparation.

Description

Technical field [0001] The invention relates to the field of nanophotonics, in particular to a surface plasmon lens integrated with a metal nanocavity. Background technique [0002] Surface Plasmon Polariton SPP is currently a hot spot in nanophotonics research. The surface plasmon is a collective oscillation of light waves that exist at the interface between metal and medium and free electrons in the metal. It is a special electromagnetic field bound by the interface. Its existence can be solved by solving the interface between metal and medium. Maxwell equations under boundary conditions. The biggest feature of SPP is that it can localize the optical field within the sub-wavelength dimension at the metal-medium interface, breaking through the diffraction limit of traditional optics, and also has a local field enhancement effect. In recent years, SPP has received extensive attention from researchers. [0003] Since SPP can manipulate the light field on the sub-wavelength scale a...

Claims

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Application Information

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IPC IPC(8): G02B3/00
Inventor 李智岳嵩陈建军龚旗煌
Owner PEKING UNIV
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