Abstract
Mass migration of photo-isomeric azo-polymers occurs according to the light intensity gradient, and the morphological surface structure can be fabricated by the artificial distribution of light by applying the interference properties of coherent laser light. Recently, the optical radiation force has played an important role in the morphology for dielectric targets, and chiral structures have been fabricated according to the spirally gathering force distribution that arises due to the electric susceptibility. On the contrary, interference laser processing has been applied to process the surface or interior of the material, and nano- or micro-structures in the lattice have been fabricated in a single exposure to the interference pattern. The unit structures are mostly axisymmetric nanowhiskers, nanodrops and nanobumps, among others. In this experiment, interference laser processing of an azo-polymer dielectric target using a circularly polarised continuous-wave (CW) laser was examined, and a spiral structure was successfully fabricated. From the viewpoint of laser processing method, an optical spiral radiation force was introduced in interference laser processing for the first time.
Highlights
The mass migration of photo-isomeric azo-polymers occurs according to the light gradient, and surface-relief gratings have been inscribed by the interference pattern of a linearly polarised beam[1,2,3]
This study aims to demonstrate spiral structure fabrication on azo-polymer film using interference pattern processing with a circularly polarised beam
The beam was split into six first-order diffracted beams and one zeroth-order beam using a diffractive optical element (DOE)
Summary
The mass migration of photo-isomeric azo-polymers occurs according to the light gradient, and surface-relief gratings have been inscribed by the interference pattern of a linearly polarised beam[1,2,3]. A detailed experiment using the parameters of momentum J = l + s, where the total angular momentum “J” is defined as the sum of the orbital momenta “l” and angular spin “s”, has been performed for a metal target[9]. In this case, the spiral frequency was primarily caused by l and to a lesser extent by s, and no spiral structure could be seen with l = 07. This study aims to demonstrate spiral structure fabrication on azo-polymer film using interference pattern processing with a circularly polarised beam.
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