Evanescent-wave-based fiber SERS (Surface Enhanced Raman Scattering) probe and preparation method thereof

A technology of optical fiber probe and optical fiber, which is applied in cladding optical fiber, optical waveguide light guide, optics, etc., can solve the problems of large SERS transmission loss of nanoparticles and limit the improvement of SERS probe sensitivity, and achieve the effect of improving sensitivity

Active Publication Date: 2019-04-05
DONGGUAN UNIV OF TECH
View PDF3 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the evanescent wave optical fiber SERS probe, although the optical fiber itself has a very low transmission loss, the absorption and scattering effects of the nanoparticles will cause a large SERS transmission loss after the noble metal nanoparticles are adsorbed on the surface.
However, when the generation of S

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Evanescent-wave-based fiber SERS (Surface Enhanced Raman Scattering) probe and preparation method thereof
  • Evanescent-wave-based fiber SERS (Surface Enhanced Raman Scattering) probe and preparation method thereof
  • Evanescent-wave-based fiber SERS (Surface Enhanced Raman Scattering) probe and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Embodiment 1 of the present invention provides an evanescent wave optical fiber SERS probe.

[0039] Such as figure 1 As shown, the evanescent wave fiber SERS probe comprises:

[0040] Optical fiber evanescent wave structure 1 and noble metal micro-nano structure 2 with Fano resonance effect; said optical fiber evanescent wave structure 1 includes single fiber taper, double fiber taper, fiber combination taper, D-type fiber, micro-nano fiber, etc. The noble metal micro-nanostructure 2 mainly includes noble metal nanoparticle clusters, periodic noble metal nanoparticle arrays, symmetry-broken noble metal nanoparticles, and the like.

[0041] The noble metal micro-nano structure 2 is arranged on the surface of the optical fiber evanescent wave structure 1;

[0042] In use, the Raman excitation light and the Raman signal light of the molecule to be measured are respectively set at the bright mode and dark mode of the Fano resonance of the noble metal micro-nano structure...

Embodiment 2

[0044] Embodiment 2 of the present invention provides a preparation method of an evanescent wave optical fiber SERS probe.

[0045] Such as figure 2 Shown, described preparation method comprises the steps:

[0046] Step 201, preparing the optical fiber evanescent wave structure; specifically includes: preparing the optical fiber evanescent wave structure by hydrofluoric acid etching method or fusion tapering method.

[0047] Step 202, according to the wavelength of the Raman excitation light and the wavelength of the Raman signal light of the molecule to be measured, determine and prepare a noble metal micro-nano structure with Fano resonance effect; specifically include: determine the wavelength of the Raman excitation light; determine the molecule to be measured The wavelength of the Raman signal light; select the noble metal material with the Fano resonance effect and the type of the noble metal micro-nano structure; according to the type of the noble metal material and t...

Embodiment 3

[0050] Embodiment 3 of the present invention provides a method for using an evanescent wave optical fiber SERS probe.

[0051] The method of use comprises the steps of:

[0052] Setting the Raman excitation light at the bright mode of the noble metal micro-nanostructure Fano resonance of the evanescent wave optical fiber SERS probe, so that the Raman excitation light is directly coupled with the bright mode, and excited at the noble metal micro-nanostructure The local surface plasmon resonance effect produces strong Raman signal light;

[0053] The Raman signal light of the molecule to be measured is set at the dark mode of the noble metal micro-nano structure Fano resonance of the evanescent wave optical fiber SERS probe, so that the Raman signal light of the molecule to be measured can be transmitted by using the low transmission loss characteristic of the dark mode. transmission.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses an evanescent-wave-based fiber SERS probe and a preparation method thereof. The evanescent-wave-based fiber probe comprises an evanescent-wave structure of an optical fiber anda noble metal micro-nano structure having a Fano resonance effect. The noble metal micro-nano structure is arranged on the surface of the evanescent-wave structure of the optical fiber. The Raman excitation light and the Raman signal light of the molecules to-be-detected are respectively arranged at a bright mode and a dark mode of the Fano resonance of the noble metal micro-nano structure, whenthe probe is used. According to the evanescent-wave-based fiber SERS probe and the preparation method thereof, the preparation method sets the noble metal micro-nano structure having the Fano resonance effect on the surface of the evanescent-wave structure of the optical fiber, utilizes the bright mode to realize an effective excitation of the Raman signal light of the molecule to-be-detected, andmeanwhile, utilizes the dark mode to realize the low loss transmission of the Raman signal light of the molecule to-be-detected in the optical fiber, thereby solving the bottleneck problem that the sensitivity of the probe is limited by a SERS saturation phenomenon in the current evanescent-wave-based fiber SERS probe.

Description

technical field [0001] The invention relates to the field of surface-enhanced Raman spectroscopy detection, in particular to an evanescent wave optical fiber surface-enhanced Raman scattering probe and a preparation method thereof. Background technique [0002] The evanescent fiber SERS (surface enhanced Raman scattering) probe refers to the preparation of noble metal nanoparticles or structures on the surface of the evanescent fiber structure (such as tapered fiber, micro-nano fiber, D-type fiber, etc.) form. On the one hand, the evanescent wave transmission characteristics of optical fiber can greatly increase the SERS interaction area, which is beneficial to improve the detection sensitivity; on the other hand, since the evanescent wave itself does not carry energy, it can effectively avoid the noble metal nanoparticles and the samples to be tested during the SERS detection process. The photothermal damage of molecules has important application prospects in the fields of...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): G01N21/65G02B6/02
CPCG01N21/65G01N21/658G01N2021/655G01N2021/656G02B6/02052G02B6/0229
Inventor 周飞刘晔凌东雄王红成
Owner DONGGUAN UNIV OF TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap