Optical nanometer antenna with dual unidirectivity, and design method thereof

A nano-antenna, dual-unidirectional technology, applied in the field of micro-nano photonics, can solve the problem that the influence cannot be ignored, and achieve the effect of good theoretical basis and technical support

Inactive Publication Date: 2016-08-10
HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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Problems solved by technology

However, the realization of the optical band antenna cannot be achieved simply by controlling the size, because when the antenna scale reaches the nanometer level or is far be

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  • Optical nanometer antenna with dual unidirectivity, and design method thereof
  • Optical nanometer antenna with dual unidirectivity, and design method thereof
  • Optical nanometer antenna with dual unidirectivity, and design method thereof

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Embodiment Construction

[0020] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] The specific structure of the optical nano antenna of the present invention is as attached figure 1 As shown, the geometric size of the entire antenna is several hundred nanometers, which is much smaller than the working wavelength of the antenna and is a deep subwavelength. The antenna is composed of square metal nanoparticles and a dielectric in the form of metal-dielectric-metal, and the metal material is noble metal, such as gold (Au), silver (Ag), platinum (Pt). The antenna works in the visible and near-infrared bands, supports localized surface plasmon resonance, and each metal particle excites an electric dipole mode along the x-direction. When the distance between two nanoparticles is relatively close (for example, d=15nm), due to the strong near-field coupling, the two particles will be hybridized. The result of hybridization ...

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Abstract

The invention brings forward an optical nanometer antenna with dual unidirectivity, and a design method thereof. A basic unit of the optical nanometer antenna is composed of a metal-dielectric-metal sandwich type structure, and under excitation of incident planar waves, the structure excites two different surface plasma resonance modes, i.e., electric dipolar resonance and magnetic dipolar resonance. Through a multistage decomposition method, a generalized Kerker condition (i.e., an electric dipole and a magnetic dipole are equivalent) for forward scattering and backward scattering is given. Besides, the influence of the nanometer antenna on far-field radiation of an electric dipole source is also argued, and for an array type metal-dielectric-metal nanometer structure, the excitation position of a dipolar radiation source plays a crucial role in deciding whether the antenna has dual unidirectivity. A theoretical base and a reference standard are provided for design of a nanometer optical device.

Description

technical field [0001] The invention belongs to the technical field of micro-nano photonics, and in particular relates to an optical micro-nano antenna which can be used to adjust far-field direction characteristics and a design method thereof. Background technique [0002] No matter in some daily life such as radio, television, remote sensing, or in the field of scientific research, antennas have been widely used, and the working wavelength of conventional antennas changes with their size. However, the realization of the optical band antenna cannot be achieved simply by controlling the size, because when the antenna scale reaches the nanometer level or is far below the optical diffraction limit, its metal nanostructure absorbs the visible and near-infrared part of the light and the quantum size effect influence cannot be ignored. In the optical frequency band, antennas have not been further studied because macroscopic optical elements such as lenses and mirrors are used to...

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Application Information

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IPC IPC(8): H01Q1/38H01Q3/00B82Y20/00
CPCB82Y20/00H01Q1/38H01Q3/00
Inventor 肖君军张小明秦菲菲张强刘真真
Owner HARBIN INST OF TECH SHENZHEN GRADUATE SCHOOL
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