Micro-medium cone and nanometal grating-compounded optical probe

Abstract

The invention provides a micro-medium cone and nanometal grating-compounded optical probe with high spatial resolution and high sensitivity. The optical probe consists of a micro-medium cone and nanometal gratings, wherein the nanometal gratings are distributed along the outer surface of the micro-medium cone, the micro-medium cone collects incident light energy with larger aperture as far as possible and gathers the light engery towards a cone top, the gathered light energy is efficiently coupled and converted into surface plasmons by the nanometal gratings, so that the surface plasmons can be continuously compressed and focused along with a cone surface, and a nano-focused high-local area strong field is formed at the tip end of the cone. In addition, regulation and optimization of nano focus can be realized through changing and optimizing the apex angle of the micro-medium cone, the structure and parameters of the gratings, and the size of an outlet. The optical probe can be used as a probe of a near field scanning microscope, an atomic force microscope and a tip-enhanced raman spectrometer, the strong nano focus formed by the optical probe can be used as a light source of nano lithography and sub-wavelength optical communication, and has important application values in the fields of nanosensing, nanoimaging, nano lithography, sub-wavelength optical communication and the like.

Description

technical field

[0001] The invention belongs to the field of optics and photoelectric technology, and relates to micro-nano optical devices, surface plasmon excitation and nano-focusing, in particular to an optical probe with high spatial resolution and high sensitivity. Background technique

[0002] How to efficiently gather, transmit and confine light energy in the nanometer region has become a key basic scientific and technical issue in the fields of photonics, plasmonics and nano-optics in recent years. Resolution and sensitivity are critical. The use of nano-metal structures to convert incident light into surface plasmons, and then guide them to highly confined nano-regions to form localized electromagnetic fields is the most effective and feasible way to break through the traditional optical diffraction limit to achieve hyperfocus. Various nanometal structure-guided surface plasmon modes have been proposed at home and abroad, mainly including nanometal particle chains...

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