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Chemical sensing system with double-crescent pair structure

A chemical sensing and crescent technology, applied in the field of chemical sensing systems, can solve problems such as unfavorable detection and restricting the range of motion of scanning probes, and meet the requirements of reducing scanning detection accuracy, light source size and collimation requirements, The effect of high sensor sensitivity

Active Publication Date: 2012-08-22
INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In the process of realizing the present invention, the applicant realized that the prior art has the following technical defects: in the process of using a single crescent-shaped nano-column for detection, the electric component formed by the excitation light is highly localized near the nano-tip, while the magnetic The component is mainly localized in the cavity of the single crescent-shaped nanocolumn, which greatly restricts the range of motion of the scanning probe, which is not conducive to actual detection

Method used

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Embodiment 1

[0039] In an exemplary embodiment of the present invention, a chemical sensing system based on a surface plasmon resonance double crescent pair structure is disclosed. The chemical sensing system includes: adjacent first crescent-shaped nanopillars and second crescent-shaped nanopillars. The first crescent-shaped nanocolumn contains a first cavity, the second crescent-shaped gold nanocolumn contains a second cavity, and openings of the first cavity and the second cavity are opposite. The first cavity is used to accommodate the detection medium, and the second cavity is used to provide the detection position of the scanning probe.

[0040]In this embodiment, the change in the refractive index of the detection medium in the first cavity causes the surface plasmon wavelength at the interface between the first crescent-shaped nanopillar and the second crescent-shaped nanopillar to shift, so that the local The surface plasmon resonance wavelength shifts accordingly, resulting in a...

Embodiment 2

[0044] On the basis of the first embodiment, the present invention provides a preferred embodiment.

[0045] In this preferred embodiment chemical sensing system, the first crescent-shaped nanopillar and the second crescent-shaped nanopillar are cylindrical, and the first cavity and the second cavity are cylindrical . The first and second crescent-shaped nanopillars may have the same or substantially the same diameter; the first and second cavities may have the same or substantially the same diameter. Preferably, the diameters of the first crescent-shaped nanocolumn and the second crescent-shaped nanocolumn are the same; the diameters of the first cavity and the second cavity are the same, and the first cavity and the second cavity are about two The dividing line is mirror-symmetrical.

[0046] In this preferred embodiment, the ratio of the diameter of the first crescent nanopillar to the diameter of the first cavity is 5:4. The ratio of the vertical distance between the op...

Embodiment 3

[0049] On the basis of the first embodiment, the present invention also provides a preferred embodiment. In this preferred embodiment, the chemical sensing system further includes: a detection light source for generating detection laser light. The detection laser is incident along the normal direction of the sidewall of the first crescent-shaped nanocolumn from the area outside the first cavity and the second cavity to excite the surface of the first crescent-shaped nanocolumn plasma wave.

[0050] In the prior art, there are photothermal effects, photodynamic effects, and other nonlinear effects in the interaction between the detection light and the detected molecules, which will affect the local refractive index of the detection medium, so that it cannot truly reflect the refractive index of the detection medium. In this embodiment, however, the crescent structure is excited outside the cavity, which completely avoids the interaction between the probe light and the probed m...

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Abstract

The invention discloses a surface plasmon resonance based chemical sensing system with a double-crescent pair structure. The chemical sensing system comprises a first crescent-shaped nanometer pillar and a second crescent-shaped nanometer pillar which are adjacent, wherein the first crescent-shaped nanometer pillar comprises a first cavity for accommodating detection media; the second crescent-shaped nanometer pillar comprises a second cavity for providing detection positions of a scanning probe; and the openings of the first cavity and the second cavity are opposite. The surface plasmon resonance based chemical sensing system provided by the invention is divided into the first cavity for detection and control and the second cavity for signal extraction; and therefore, the separation of adetection direction and a signal extraction direction is realized and the problem that the detectable range of the scanning probe is limited because of the electromagnetic field localization of single crescent-shaped nanometer pillar is solved.

Description

technical field [0001] The invention relates to the technical field of surface plasmon optoelectronic devices, in particular to a chemical sensing system based on a surface plasmon resonance double crescent pair structure. Background technique [0002] In plasmon optics, localized surface plasmon resonances have attracted intense research interest. It depends on the size, shape and dielectric parameters of the metal nanostructures. Based on the optical characteristics of metal nanoparticles, plasmonic optics has many attractive applications, such as chemical and biomedical sensing, surface-enhanced spectroscopy, etc. Unlike the usual detection mechanism for surface plasmon resonance, which is a change in the plasmon excitation angle, plasmonic nanoparticles exhibit a shift in the plasmon resonance frequency. A major advantage of using nanoscale particles rather than metallic films as sensing systems is their extremely small size enabling measurement of analyte volumes as s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/225B82Y15/00
Inventor 郑婉华王宇飞晏新宇付非亚刘安金周文君陈微
Owner INST OF SEMICONDUCTORS - CHINESE ACAD OF SCI
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