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MIM type nanorod dimer capable of realizing triple Fano resonance

A technology of nanorods and dimers, applied in measuring devices, material analysis through optical means, instruments, etc., can solve problems such as resonance peak spectrum line width, limited sensing sensitivity, and large radiation loss of LSPR resonance spectrum lines. Achieving increased sensitivity and accuracy

Inactive Publication Date: 2016-09-28
TIANJIN UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0003] The radiation loss of the LSPR resonant spectral line is relatively large, and the resonant peak spectral line width limits its sensing sensitivity

Method used

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  • MIM type nanorod dimer capable of realizing triple Fano resonance
  • MIM type nanorod dimer capable of realizing triple Fano resonance
  • MIM type nanorod dimer capable of realizing triple Fano resonance

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Embodiment

[0016] A MIM-type nanorod dimer that can achieve three Fano resonances, as figure 1 , 2 As shown, the metal-insulator-metal (MIM) nanorod dimer structure is used to excite the magnetic surface plasmons (Megnetic surface plasmons, MSPs) through the coupling of different in-plane nanorod LSPR modes, and three Fano resonances are obtained. ; On the xy plane, two MIM-type nanorods of the same size are arranged side by side, and the distance between the two nanorods in the y direction is G, G=10nm, and the width is W, W=40nm, on the xz plane The length in the x direction is L, L=140nm, the thickness in the z direction is T, T=50nm, the material of the two metal layers is gold Au, the thickness is equal, both are 20nm, the dielectric layer between the two metal layers is dioxide Silicon SiO 2 , with a thickness of 10nm.

[0017] The incident light is irradiated on the dimer vertically along the z axis, and the electric field direction distribution is parallel to the short axis of...

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Abstract

An MIM type nanorod dimer capable of realizing triple Fano resonance adopts a metal-insulator-metal (MIM) type nanorod dimer structure, and realizes triple Fano resonance through exciting magnetic surface plasmons (MSPs) to obtain triple Fano resonance; and two MIM type nanorods with completely same dimensions are arranged in a side-to-side manner in the xy plane, the material of two metal layers is gold (Au), the thicknesses of the two metal layers are same, and a dielectric layer between the two metal layers is silica (SiO2). The MIM type nanorod dimer structure is simple, is easy to prepare, can realizes triple Fano resonance, and can be used to design and produce multi-wavelength optoelectronic devices; and when the MIM type nanorod dimer structure is used in biochemical sensing, the low loss characteristic of Fano resonance and the common sensing using multiple wavelengths with different sensitivities make the sensing sensitivity and the sensing accuracy be improved.

Description

technical field [0001] The invention relates to the Fano resonance of metal nanostructures, in particular to a MIM nanorod dimer capable of realizing three times of Fano resonance. Background technique [0002] Based on the great development of micro-nano structure processing technology in recent years, nano-optoelectronics technology enables optical signals to be processed and transmitted on a nanometer scale, thus becoming a research hotspot. The Localized Surface Plasmon Resonance (LSPR) effect of metal nanostructures makes the excitation light field locally enhanced around the nanostructures, and is sensitive to changes in the surrounding medium environment. It is widely used in the research of biochemical sensors. with preparation. [0003] The radiation loss of the LSPR resonant line is relatively large, and the line width of the resonant peak spectrum limits its sensing sensitivity. The mutual coupling of LSPR resonance modes in metal nanostructures can realize an a...

Claims

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Application Information

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IPC IPC(8): G01N21/552
CPCG01N21/554
Inventor 刘菲薛力芳石艳梅
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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