Synthesis and optical manipulation of multi-branched plasmonic waveguide composite nanostructures

Abstract

The invention includes the synthesis of multi-branch plasmon waveguide composite nanostructure and its optical manipulation method. The synthesis method includes multiple steps, and each step can be precisely controlled. The backbone of the tree-shaped nanostructure and the thickness of the dendritic nanostructure grown on it can be precisely controlled, and quantum dots with or without shells are superimposed on the surface of the tree-shaped nanostructure to form a quantum dot composite tree-shaped nanostructure. Dots can be used in applications such as chemical catalysis, environmental monitoring, and biosensing. Light is incident from one end of the nanowire, passes through the nanowire and dendritic structure, and excites the shelled quantum dot to emit light, which can be used in applications such as remote sensing Raman and new lasers. The intensity and polarization state of the incident light can be changed through optical manipulation, and the quantum dots in a specific area can be controlled to emit light, which can eliminate the crosstalk effect caused by the interference and diffraction effect between scattering centers, so that it can be used for sub-wavelength high-resolution detection.

Description

technical field [0001] The invention relates to the fields of nanomaterials and chemical biology, in particular to a method for synthesizing and optically manipulating a multi-branch plasmon waveguide composite nanostructure. Background technique [0002] Plasmon waveguides are sub-wavelength waveguides that can confine photons to be transmitted near the surface of the waveguide, thereby breaking through the diffraction limit and manipulating photons on the sub-wavelength or even nanometer scale. Interconnection, solar cells and many other aspects have broad application prospects and have received extensive research attention. Silver nanowire is a kind of plasmonic waveguide, which has attracted extensive research because it can be synthesized in large quantities by chemical methods, and is non-toxic and harmless. However, at the same frequency, the wave vector of surface plasmons is larger than that of light, which prevents silver nanowires from being directly excited by p...

AI Technical Summary

Problems solved by technology

The existing micro-nano optical structures are densely arranged in the scattering centers, and when the distance between adjacent scattering centers is relatively close, interference and diffraction between scattered waves are likely to occur, causing crosstalk

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