Antenna-assisted dual-wavelength multifunctional sensing element, preparation method and application

A sensing element and dual-wavelength technology, applied in the field of sensing, can solve the problems that the enhancement effect needs to be further improved, and achieve convenient biological detection, improve the effect of Raman enhancement, and improve the effect of Raman enhancement

Active Publication Date: 2019-04-16
CHANGSHU ZHERUIGEN OPTOELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this structure solves the problem of long-wavelength Raman enhancement and the integration of Raman sensing and refractive index sensing, its enhancement effect still needs to be further improved for single-molecule detection.
[0005] In addition, for the single resonance structure, there is a "bandwidth" contradiction when realizing the two functions of Raman enhancement and refractive index sensing at the same time - that is, Raman enhancement needs to have as wide a bandwidth as possible to enhance the excitation light and scattered Raman signals at the same time, and based on The plasmon resonance refractive index sensor pursues a narrower bandwidth and achieves a higher quality factor

Method used

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  • Antenna-assisted dual-wavelength multifunctional sensing element, preparation method and application
  • Antenna-assisted dual-wavelength multifunctional sensing element, preparation method and application
  • Antenna-assisted dual-wavelength multifunctional sensing element, preparation method and application

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Embodiment 1

[0034] A specific embodiment of the present invention is given below. Set the gold substrate to be thick enough that no light can pass through; the periods along the long axis and short axis of the gold bowtie are 0.6um and 0.4um respectively; the height of the gold bowtie and the gold bar are both 0.055nm; the width of the gold bar is 0.1um; The height of the two isosceles triangles that make up the golden bow tie is 0.14um, the apex angle is 50°, and the gap between the apex angles is 0.01um. This embodiment is designed to use 0.633um laser to excite and detect 0.78um (3000cm -1 ) near the Raman scattering signal. The position of the first resonance peak can be adjusted to match the wavelength of the excitation light by adjusting the height of the apex to the base of a pair of isosceles gold triangles that make up the golden bow tie. Adjusting the height of the golden bowtie can adjust the position of the second formant to match the wavelength of the Raman signal to be det...

Embodiment 2

[0039] The antenna-assisted dual-wavelength multifunctional sensing element of the present invention can be prepared by the following steps: sputter 0.2um gold on any flat substrate as a substrate, and the thickness is enough to prevent light from passing through. The 0.18um positive photoresist PMMA950K is spin-coated on the gold substrate. The thickness of the photoresist and the thickness of the construction material are about 3:1 to ensure the feasibility of the subsequent stripping process. The bowtie-strip structure is exposed on the photoresist by electron beam exposure technique. After development, the exposed part is washed off, leaving bowtie-strip pits, and 0.055um gold is directional evaporated in these pits. After cleaning off the residual glue, a gold bow tie-gold bar periodic arrangement structure is left on the substrate.

[0040] By designing different structures, the double peak structure of the present invention can be applied to different excitation and sc...

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Abstract

The invention discloses an antenna assisted dual-wavelength multifunctional sensing element, a preparation method and an application. The sensing element comprises a substrate with a metallic character, wherein periodically arranged bowtie structures which are made of the same material or different materials but also have the metallic character as well are constructed on the substrate; a micro-nano antenna is constructed between adjacent gold bowties, capturing capacity for incident light is improved by the micro-nano antennae, so that excitation efficiency of a sub-radiant mode is improved, and the Raman enhancement effect is further improved. With addition of antenna design, the Raman enhancement of a dual-wavelength multifunctional biosensor is doubled that of a structure without the antennae and is improved by one order of magnitude compared with a single gold bowtie structure. The multiple problems in the field of the sensor are solved simultaneously with the adoption of one plasma resonance structure.

Description

technical field [0001] The invention relates to the sensing field, in particular to an antenna-assisted dual-wavelength multifunctional sensing element, a preparation method and an application. Background technique [0002] Biosensors have extensive and important applications in medical testing, food safety, environmental monitoring and other fields. Biosensors mainly realize two functions—identification of unknown molecules and concentration detection of known molecules. The main technique currently used for molecular screening is Raman spectroscopy. Raman spectroscopy analysis technology is based on the Raman scattering effect, which analyzes the scattering spectra of different incident light frequencies to obtain molecular vibration and rotation information, and is an analytical method applied to molecular structure research. Therefore, different molecules will have completely different Raman scattering spectra, which is also called the "fingerprint" of the molecule. H...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N21/65G01N21/41
Inventor 林娇何赛灵
Owner CHANGSHU ZHERUIGEN OPTOELECTRONICS TECH
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