A method for preparing chiral woodpile photonic crystals based on holographic lithography
A photonic crystal and lithography technology, which is applied in the direction of optical waveguide light guide, cladding optical fiber, microstructure optical fiber, etc., can solve the problems of manufacturing and unrealized large-scale preparation of Woodpile photonic crystals in the visible light band.
Active Publication Date: 2021-05-18
QINGDAO UNIV OF SCI & TECH
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However, such structures have so far been difficult to fabricate at optical frequencies
[0003] Based on this, in 2015, the C.T.Chan research group of Hong Kong University of Science and Technology reported that due to the chiral connection of chiral Woodpile photonic crystals, Weyl points can exist in the photonic crystals, but it has not achieved large-scale preparation of Woodpile photonic crystals in the visible light band.
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[0026] This embodiment uses prism combination technology and polarization adjustment technology to prepare chiral Woodpile photonic crystals. The specific implementation methods and steps are as follows:
[0027] (1) Linearly polarized light 1 emitted from an external laser passes through a collimated beam expander system and a porous aperture 2 to obtain four beams of coherent light. The wavelength of the coherent light is 488nm, such as figure 2 The straight arrows shown are four beams of coherent light;
[0028] (2) The four beams of coherent light are divided into upper and lower parts, in which the upper part is divided into a beam of coherent light with a 30° angle to the horizontal direction, and the lower part is divided into three beams of coherent light, and each beam is sandwiched between adjacent x-y plane projections The angles are all 60°, and the upper part of the coherent light path is realized through prism A. The specific parameters of prism A are as follows...
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The invention belongs to the technical field of photonic crystal preparation, and relates to a method for preparing chiral Woodpile photonic crystals based on holographic lithography technology. The Dove prism and the regular hexagonal prism placed in the upper and lower spaces converge and interfere. The upper and lower surfaces, front and rear sides of the Dove prism are light-transmitting surfaces, and the left and right inner sides of the prism are mirror surfaces; On the light-transmitting surface, the preparation of Woodpile photonic crystals can be realized in a single exposure with four beams of light converging and interfering. The method is simple, easy, economical and convenient, and can prepare the desired photonic crystal structure in a large area.
Description
Technical field: [0001] The invention belongs to the technical field of photonic crystal preparation, and relates to a method for preparing chiral Woodpile photonic crystals based on holographic photolithography technology, in particular to a method for preparing chiral Woodpile photonic crystals by using a combined prism system. Background technique: [0002] In recent years, with the development of condensed matter observation technology, researchers have observed the Weyl point predicted by Hermann Weyl more than 80 years ago in their energy band structure, which has aroused people's interest in exploring Weyl fermions. The Weyl point is the non-removable intersection point of two band gaps in the three-dimensional k-space, even a small perturbation cannot open the band gap, but only moves the position of the Weyl node in the k-space. Recently, it has been observed in electronic experimental systems that Weyl semimetals can be realized in Dirac semimetals by employing inv...
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IPC IPC(8): G02B6/02G03H1/00
CPCG02B6/02295G03H1/0005G03H2001/0094
Inventor 王霞赵秋玲吕浩尤凯刘静滕利华高鹏谭永炎
Owner QINGDAO UNIV OF SCI & TECH