Silicon trimer nano optical tweezer structure and nano particle capturing and moving method

Abstract

The invention discloses a silicon trimer nano optical tweezer structure and a nano particle capturing and moving method. The silicon trimer nano optical tweezer structure comprises a silicon substrateused for absorbing joule heat generated in a laser light field; a silicon trimer located on the substrate and used for acting with the laser to form a local electric field and capturing the nanoparticles; and a planar light wave used for acting with the silicon trimer to generate an evanescent field. The electric field enhanced distribution of the nanoparticles in the light field where the silicon tripolymer nano optical tweezer structure is located is calculated, and the minimum size and the capture position of the captured nanoparticles can be quantitatively analyzed through light-gatheringpower and potential energy. The change of the hot spot position in the silicon trimer can be realized by changing the polarization of the laser, so that the capture position of the nano-particles inthe silicon trimer is changed, and the function of moving the nano-particles in the silicon trimer is realized. Nanoscale microcosmic particle manipulation is achieved, and the method can be applied to manipulating chiral particles to conduct nanoscale measurement.

Description

technical field [0001] The invention belongs to the technical field of light manipulation, and in particular relates to a silicon trimer nano optical tweezers structure and a method for capturing and moving nanoparticles. Background technique [0002] Optical tweezers have the characteristics of no mechanical damage and no contact manipulation. They can manipulate particles in three-dimensional space, and can also directly measure tiny forces, diffusion coefficients, and refractive indices of particle materials, and control DNA stretching, virus screening, and cell deformation. These advantages make optical tweezers have important applications in modern medicine, biology, chemistry, physics and other fields. [0003] However, metal nano-optical tweezers suffer from serious photothermal effects when trapping particles. Due to the strong absorption loss of metals at optical frequencies, plasmonic nano-optical tweezers will experience Joule heating, which usually reduces the st...

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Problems solved by technology

[0008] The purpose of the embodiments of the present invention is to provide a silicon trimer nano-optical tweezers structure, which can achieve low heat absorption, no thermal damage to the captured substances, can stably capture nanopartic

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