Method for machining butterfly-shaped nanometer gap through coordinative shaping of femtosecond laser phase position amplitude

Abstract

The invention relates to a method for machining a butterfly-shaped nanometer gap through coordinative shaping of femtosecond laser phase position amplitude and belongs to the technical field of laserapplication. A reflecting type phase position type liquid crystal spatial light modulator can carry out phase position modulation on incident light, thus reflected light has designated phase positiondistribution on space, meanwhile, a narrow gap is utilized for carrying out amplitude shaping on light beams obtained after phase position shaping, and thus coordinative shaping of the phase positionand the amplitude of the initial light beams is achieved. The light beams obtained after coordinative shaping pass through a focusing objective lens to be focused, and multi-light-point light beams with different structure parameters are formed. The generated multi-light-point light beams are utilized for machining a designated material, material removal can be achieved in the area with strong light intensity, the material is kept in the area with the weak light intensity, and thus the butterfly-shaped nanometer gap can be obtained. According to the method, a light path needing to be set up issimple, use is convenient, a mask and vacuum environment are not needed, the machining cost is low, the machining efficiency is high, and the method plays an important role in the machining field oflaser micro nanometer structures.

Description

technical field [0001] The invention relates to a femtosecond laser phase-amplitude collaborative shaping method for butterfly-shaped nano-slits, belonging to the technical field of laser applications. Background technique [0002] In recent years, nanoslits have broad application prospects in the fields of biosensing, optoelectronics, and nano-optics. Traditional processing methods can be generally divided into two categories. The first category uses traditional methods such as using external mechanical force to generate nanoscale deformation, using electricity to fuse existing nanowires, and electrochemical / chemical deposition. This type of processing method is difficult to obtain. High-precision nano-slits, and the position, size and shape of the generated nano-slits are difficult to control; the second type uses short-wavelength high-energy beams such as ion beams, electron beams, etc. for processing, and this type of processing can obtain high-resolution However, the e...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of low precision, environmental unfriendliness and low efficiency in the existing traditional methods, and provide a method for processing butterfly-shaped nano-slits by using femtosecond laser direct writing in one step

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