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Silicon nanosphere trimer-based unidirectional optical nano antenna structure

A nano-antenna and antenna structure technology, applied in optics, optical components, light guides, etc., can solve problems such as changes in far-field radiation characteristics, and achieve the effects of suppressing backscattering, improving unidirectionality, and enhancing scattering characteristics

Active Publication Date: 2019-08-23
NORTHEAST GASOLINEEUM UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, the scattering and radiated electromagnetic fields of nano-antennas will have coherent effects in the far field, resulting in changes in the far-field radiation characteristics.

Method used

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  • Silicon nanosphere trimer-based unidirectional optical nano antenna structure
  • Silicon nanosphere trimer-based unidirectional optical nano antenna structure
  • Silicon nanosphere trimer-based unidirectional optical nano antenna structure

Examples

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Effect test

Embodiment 1

[0039] A unidirectional optical nano-antenna structure based on a trimer of silicon nanospheres, the antenna structure is composed of three nanospheres symmetrically along the X=Y axis, the diameter D of the three nanospheres is 200-280nm, The distance between the nanospheres located on both sides of the symmetry axis and the nanospheres located at the center of the symmetry axis is 0; the material of the nanospheres is high dielectric material silicon; the diameter D of the nanospheres is 240nm, located on both sides of the symmetry axis The distance L between the nanosphere on the side and the center of the nanosphere at the axis of symmetry is 240nm; the background refractive index of the unidirectional optical nanoantenna structure of the silicon nanosphere trimer is constant 1, and the silicon nanosphere three Under the excitation of the external field, the polymer nanoantenna will produce localized surface plasmon resonance; the incident light of the unidirectional optica...

Embodiment 2

[0057] The diameter D of the nanospheres is 200 nm.

Embodiment 3

[0059] The diameter D of the nanospheres is 280 nm.

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Abstract

The invention relates to an optical nano antenna, in particular to a silicon nanosphere trimer-based unidirectional optical nano antenna structure. The antenna structure is formed by three nanospheresin an X=Y axis symmetric form; the diameters D of the three nanospheres are 200-280 nm; the distances between the nanospheres located on the two sides of the symmetric axis and the nanosphere locatedat the center of the symmetric axis are 0; and the material of the nanospheres is a high dielectric material silicon. The structure can be used for adjusting the far-field direction characteristics;the wave vectors of incident waves are parallel to the x axis direction; and the polarization is parallel to the y axis direction. By utilizing a multistage decomposition method for analysis, the structure not only supports electric dipole and magnetic dipole resonance, but also supports electric quadrupole and annular dipole resonance; and through the coupling of the resonance modes, the far-field unidirectional scattering of the high dielectric material silicon nanosphere trimer structure is realized. Solid theoretical foundation is provided for realizing far-field unidirectional controllable nano antennas.

Description

[0001] Technical field: [0002] The invention relates to an optical nano-antenna, in particular to a unidirectional optical nano-antenna structure based on a silicon nanosphere trimer. [0003] Background technique: [0004] Nanoparticles have become one of the most popular research topics in the field of light scattering, optical nanoantenna Due to its strong absorption and the ability to guide incident light to a specific direction on the nanometer scale, it has a wide range of applications and great potential in the fields of biosensing, light emitting devices, and optical microscopy. As the medium of electromagnetic waves, nano-optical antennas combine the advantages of traditional microwave antennas. They are effective tools that can convert electromagnetic energy in free space and electromagnetic energy in local fields, and realize the mutual conversion between electromagnetic wave transmission fields and local fields. With the continuous maturity of nano-optics, nano-s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/00G02B6/10G02B6/122
CPCG02B5/008G02B6/107G02B6/122
Inventor 刘超许文静吕靖薇汪发美孙宇丹刘强刘伟杨琳吕婷婷刘睿骑
Owner NORTHEAST GASOLINEEUM UNIV
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