Bowknot nanometer antenna device based on vanadium dioxide phase change dynamic adjustment and method

A vanadium dioxide and nano-antenna technology, which is applied in the directions of devices, antennas, and radiating element structures that make antennas work in different bands at the same time, can solve the problem of less research on tunable nano-antennas, and no research on tunable bow-tie nano-antennas, etc. problem, to achieve the effect of simple adjustment method and wide adjustment range

Active Publication Date: 2019-07-23
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are relatively few studies on tunable nanoantennas based on vanadium dioxide, especially the tunable bowtie nanoantennas based on vanadium dioxide have not yet been studied.

Method used

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  • Bowknot nanometer antenna device based on vanadium dioxide phase change dynamic adjustment and method
  • Bowknot nanometer antenna device based on vanadium dioxide phase change dynamic adjustment and method
  • Bowknot nanometer antenna device based on vanadium dioxide phase change dynamic adjustment and method

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Embodiment 1

[0029] Embodiment 1: provide a kind of preparation method based on the bowtie nanoantenna device (hereinafter referred to as the bowtie nanoantenna device) dynamically adjustable based on vanadium dioxide phase transition, mainly comprising:

[0030] The first step is to coat a vanadium thin film on a glass substrate by electron beam evaporation. When coating, the air pressure in the upper and lower chambers is 10 - 5 Torr, the coating rate is Coating time is about 1000 seconds.

[0031] In the second step, the sample is annealed in a tube furnace. First, evacuate the gas pressure in the quartz tube to 10 before annealing -1 Below Pa; then, feed oxygen, and adjust the gas flow to stabilize the pressure in the quartz tube at 10Pa; then, raise the temperature to 450°C; the annealing time is more than 60 minutes, and finally, the sample is taken out after natural cooling to room temperature, so that A vanadium dioxide thin film with a thickness of 100 nm was obtained.

[0...

Embodiment 2

[0042] Example 2: Using the above method, we prepared 6 samples with different triangular gaps, the triangular gaps varied from 10nm to 60nm, with a step size of 10nm, and other structural parameters were the same as the samples in Example 1.

[0043] We discuss the effect of the triangular gap on the optical properties of the composite bow-tie nanoantenna at different temperatures. figure 2 (a) and (b) show the reflectance spectra of samples with different triangular gaps at x-polarized incidence at 20°C and 80°C, respectively. As the triangle gap increases, the mid-valley of the reflection spectrum shifts blue due to the decrease in the coupling of the two triangles. figure 2 (c) shows the variation of the wavelength of the 20°C and 80°C valleys with the triangle gap. When the temperature changes, the valleys in the reflectance spectra of these samples are all red-shifted, but the variation of the valley wavelength at different temperatures is almost independent of the tr...

Embodiment 3

[0044] Example 3: Using the above method, we prepared 6 samples with different triangle side lengths, the triangle side length was changed from 200nm to 300nm, with a step size of 20nm, and other structural parameters were the same as the samples in Example 1.

[0045] We discuss the effect of the triangle side length on the optical properties of composite bow-tie nanoantennas at different temperatures. image 3 (a) and (b) show the reflectance spectra of samples with different triangle side lengths at 20°C and 80°C, respectively, under x-polarized incidence. When the triangle side length increases, the mid-valley redshift of the reflection spectrum is due to the increased delay effect between the incident electromagnetic field and the depolarization field in the bow-tie nanoantenna. image 3 (c) shows the variation of the wavelength of the trough at 20°C and 80°C with the side length of the triangle. When the temperature changes, the valleys in the reflectance spectra of the...

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Abstract

The invention discloses a bowknot nanometer antenna device based on vanadium dioxide phase change dynamic adjustment. The bowknot nanometer antenna device comprises a vanadium dioxide film formed on asubstrate; a dielectric film formed on the vanadium dioxide film; and a metal antenna layer consisting of bowknot metal units which are periodically arranged on the dielectric film; each bowknot metal unit is composed of two structures which are symmetrical in the mirror direction. Furthermore, the invention also discloses a preparation method of the bowknot nanometer antenna device and a methodfor adjusting the resonant wavelength of the nano antenna. According to the invention, the resonance wavelength can be dynamically regulated and controlled in a near-infrared large wavelength range, and the bowknot nanometer antenna device can be applied to the fields of dynamically adjustable higher harmonics, dynamically adjustable molecular fluorescence, dynamically adjustable Raman scattering,dynamically adjustable nano laser and the like.

Description

technical field [0001] The invention belongs to the technical field of nano-antennas, and in particular relates to a dynamically adjustable nano-antenna technology based on vanadium dioxide phase transition. Background technique [0002] Plasmonic nanoantennas have been extensively studied in the past two decades. These artificial micro-nanostructures can compress the electromagnetic field to the subwavelength scale and release electromagnetic radiation to the far field. Various types of nanoantennas have been designed so far to achieve different purposes, including individual nanospheres and nanorods, nanosphere and nanorod dimers, Yagi nanoantennas, and bowtie nanoantennas. Among these nanostructures, the bow-tie nanoantenna has attracted extensive research, due to the localized surface plasmons in the bow-tie structure and the coupling characteristics between the two ends, which have superior field localization and field enhancement properties, therefore, the bow-tie Na...

Claims

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Application Information

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IPC IPC(8): H01Q1/38H01Q5/307C23C14/06C23C14/18C23C14/30C23C14/58
CPCH01Q1/38H01Q5/307C23C14/30C23C14/18C23C14/5853C23C14/06
Inventor 彭茹雯束方洲王嘉楠王牧范仁浩祁冬祥熊翔
Owner NANJING UNIV
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