A femtosecond laser-based preparation method for cracked nano-gap structure
A femtosecond laser and nano-slit technology, applied in the field of laser applications, can solve the problems of high cost, cumbersome process, and low efficiency
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[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings.
[0030] like figure 1 , a femtosecond laser-based fabrication method for cracked nano-slits. First, a linearly polarized femtosecond laser (center wavelength 800 nm) was irradiated to a liquid crystal spatial light modulator (SLM) at a small angle. In this example, a spatial shaper is used to transform the light field intensity profile of the incident laser from a Gaussian to a bimodal beam, and its phase is expressed as follows:
[0031]
[0032] The spatially shaped femtosecond laser passes through two equal focal lengths (f 1 =f 2 = 500mm) optical lens composed of 4f optical system to carry out beam phase transfer, to avoid the diffraction and distortion of the laser phase due to long-distance propagation. In the 4f system, the distance from the SLM liquid crystal surface to the lens 1 should be equal to the focal length of the lens, the distance bet...
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