Preparation method of photonic crystal based on 3D printing and photonic crystal

Abstract

The invention discloses a photonic crystal based on 3D printing and a preparation method thereof. The preparation method comprises the following steps that S1, slurry is prepared, the elasticity modulus of the slurry is larger than the viscous modulus, the slurry has viscoelastic inversion performance, the slurry is prepared from polydimethylsiloxane and a ceramic material, the slurry is divided into slurry A and slurry B; the dielectric constant of the slurry A is not equal to that of the slurry B; S2, a first crystal layer is formed from the slurry A and forming a second crystal layer from the slurry B by film-free direct-writing 3D printing equipment, and the first crystal layer and the second crystal layer are stacked to form a wood pile structure to obtain a photonic crystal semi-finished product; and S3, the photonic crystal semi-finished product is cured to obtain the photonic crystal. According to the preparation method, the process is simple, the prepared photonic crystal is high in precision, the stealth of terahertz waves with different frequency bands can be realized, and the applied wave band can be in a range of 10 GHz-10 THz.

Description

technical field [0001] The invention relates to the technical field of photonic crystals, in particular to a preparation method based on 3D printing photonic crystals and photonic crystals. Background technique [0002] Terahertz (THz) waves refer to electromagnetic waves with a frequency of 0.1THz to 10THz and a wavelength range of 30μm to 3mm. Terahertz waves have "dual characteristics" of both microwaves and light waves, that is, similar to microwave penetration and similar The directionality of light waves has very strong complementary characteristics compared to electromagnetic waves in other wave bands. Compared with microwave and millimeter wave, THz detection technology can obtain higher resolution, has outstanding anti-interference ability and unique anti-stealth ability; compared with laser, THz technology has wide field of view, good search ability, and is applicable In bad weather conditions and other advantages. [0003] Photonic crystal is a periodic dielectr...

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Problems solved by technology

In this method, a long cylindrical shell with a wood pile structure is first formed, and then different dielectric materials are injected. The process is complex, and the precision of the produced photonic crystal is low; in addition, the width of the long cylindrical body formed by this method is difficult to reach the micron level. , the width of the dielectric rods formed by the injection of the dielectric material after molding is also difficult to reach the micron level, so the photonic crystals prepared by this method can only be used in the wavelength band below 1GHz

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