Method capable of realizing neutral cold atom laser guidance with nano-scale cross section

Abstract

The invention discloses a method capable of realizing neutral cold atom laser guidance with a nano-scale cross section, and relates to the field of neutral cold atom laser guidance. The method provided by the invention is realized by a laser system, a beam splitter, metal wedges, a reflector, a Bose-Einstein condensate, a blocking beam, an atom detector, a chopper, a focusing mirror, an optical fiber, and a computer system based on a metal structure surface plasmon technology. The laser irradiates the side surfaces of the two oppositely and obliquely upward metal wedges which are horizontally arranged in parallel to excite to form surface plasmons, the local enhanced electromagnetic fields of the surface plasmons are superimposed in space, and the surface plasmons have the characteristics of breakthrough of a diffraction-limited spatial dimension, thus realizing the guidance of the guided neutral cold atoms in a nano-scale cross-section light field. The method provided by the invention is suitable for nano-scale laser guidance of different neutral cold atoms, and has the advantages of simple principle, convenience in operation and wide application range.

Description

Technical field [0001] The present invention relates to the field of guidance of neutral cold atoms, and particularly refers to a method of laser guidance for neutral cold atoms in a nano-scale cross section, which is suitable for guiding any type of neutral cold atoms. Background technique [0002] Since Hansch et al. put forward the concept of laser cooling atoms in 1975, the theoretical and experimental research of laser cooling, trapping and manipulating neutral atoms has made a series of major advances, making laser science, quantum optics and cold atoms, molecular physics, etc. Significant changes have taken place, creating a whole new field of research. The laser guidance, imprisonment and manipulation of atoms rely on the effect of the light field on the neutral atoms. In fact, it uses the dipole force generated by the gradient of the light field on the atoms. When there is no external field, neutral atoms are electrically neutral, and the internal electron distribution ...

AI Technical Summary

Problems solved by technology

Although great achievements have been made in the research of atomic laser guidance, due to the influence of the diffraction limit of light, the traditional focusing spot size or propagation beam diameter can only be limited to the linear range of the half-wavelength order, so far the realization of The scale of the light field cross-section guided by cold atom optics is generally on the order of microns, so this will bring some shortcomings to the basic research and technical characteristics of atom optics, such as atomic prism aberration, low diffraction efficiency of atomic matter waves, Contrast limitation of atomic matter wave interference fringes, etc.

At the same time, with the continuous development of microfabrication technology and integrated optics, the continuous miniaturization of optical components has approached the diffraction limit of light, which will lead to bottlenecks in the optical confinement and manipulation of atoms at the nanoscale

Images