Bowknot-shaped antenna achieving waveguide mode of UWB (ultra wide band) excitation of surface plasma

A surface plasmon, ultra-broadband technology, applied in the fields of light guide, optics, instruments, etc., can solve the problems of complex manufacturing, and achieve the effect of stable excitation efficiency and unique broadband characteristics

Inactive Publication Date: 2017-06-20
UNIV OF SHANGHAI FOR SCI & TECH
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  • Abstract
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  • Claims
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Problems solved by technology

[0005] The researchers proposed to demonstrate a broadband high-efficiency excitation method using butterfly-s...

Method used

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  • Bowknot-shaped antenna achieving waveguide mode of UWB (ultra wide band) excitation of surface plasma
  • Bowknot-shaped antenna achieving waveguide mode of UWB (ultra wide band) excitation of surface plasma

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Embodiment Construction

[0013] For ease of description of the application, the relevant terms involved in the application are explained as follows:

[0014] 1. Ultra-broadband: The band width at half the height of the monochromatic spectral line intensity profile emitted from the monochromator. Ultra-broadband means that the spectral range is very wide, covering most of the spectral line range.

[0015] 2. Surface plasmon: a non-radiative electromagnetic mode formed by the mutual coupling of free electrons and incident photons on the metal surface. It is a mixed excited state that propagates locally on the surface of the metal and the medium. This mode exists near the metal-dielectric interface, and its field strength reaches its maximum at the interface, and decays exponentially on both sides of the interface along the direction perpendicular to the interface. Surface plasmons have strong field confinement properties, which can confine the field energy to a region whose spatial size is much smaller ...

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Abstract

The invention relates to a bowknot-shaped antenna achieving a waveguide mode of UWB (ultra wide band) excitation of surface plasma, and the antenna structure comprises a silicon dioxide bottom layer and a silver layer, which are arranged at the top and bottom. The silver layer is deposited on the surface of the low-refractive-index silicon dioxide through a magnetron sputtering machine, and is shaped like a racket, wherein the surface of the racket is rectangular, and the handle of the racket is in the shape with the equal width, thereby forming a strip-shaped waveguide. Two isosceles triangles with the opposite top points are etched through a focused ion beam, thereby forming the bowknot-shaped antenna structure. A focused Gaussian light beam irradiates the bowknot-shaped antenna structure vertically, thereby exciting the surface plasma. The method solves a problem that the surface plasma is low in excitation efficiency in the prior art, and the excitation light covers most of the visual light till the near infrared range. The antenna is unique in broadband characteristics, and will be widely used in the next generation plasma integrated chip and a function device.

Description

technical field [0001] The invention relates to an optoelectronic device, in particular to a bowtie-shaped antenna for realizing ultra-broadband excitation of surface plasmon waveguide modes. Background technique [0002] Surface plasmons are light waves coupled into nanoscale high-intensity field enhancements. The intrinsic properties of surface plasmons facilitate the optical transmission of some special nanostructure arrays. Studies have found that some arrays have higher transfer efficiencies than single wells. The optical properties of metal apertures with different geometries, such as circular, triangular, ridge or butterfly structures, have been intensively studied theoretically and experimentally. The above structure can form a strong hot spot on the sharp edge, and also has a tunable resonance peak. [0003] Compared with the dipole antenna, the bow-tie structure has multiple resonances and a strong electric field to enhance the broadband effect. Although the op...

Claims

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Application Information

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IPC IPC(8): G02B6/122
CPCG02B6/1226
Inventor 文静冯辉吕亚婷王康刘仕良张大伟
Owner UNIV OF SHANGHAI FOR SCI & TECH
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