Preparation Of TiO₂three-dimensional Photonic Crystals And Its Interaction With Laser

As while the rapid development of laser technology bring convenience to industrialproductions and human lives, it may also cause some safety problems. Traditional laserprotection materials have some weaknesses, such as protective angle requirement, lowtransmittance, and so on. But the protection effect does not meet the expectation. Inrecent years, there’s a new generation of laser protection materials. In some extent, thesematerials overcome the shortcomings of traditional laser protection materials, but it alsohas some inevitable limitations.With the existence of photonic band gap and the characteristic of control the lightpropagation, three-dimensional photonic crystals are expected to become the new trendof the photons industry. Using three-dimensional photonic crystals as laser protectionmaterials will make up the shortfall of existing protective materials, and it will open upnew ideas and directions in the field of laser protection. In this circumstance, Idesigned and prepared TiO2three-dimensional photonic crystals, optimized itspreparation technology, studied the characteristics of three dimensional photoniccrystal’s band gap, and explored the damage threshold characteristics and the ablationmorphology of three-dimensional photonic crystals.First of all, TiO2three-dimensional photonic crystals were prepared by cathodicelectrodeposition with PS colloidal crystal as template, and the preparation technologywas optimized. Using XRD, SEM, XPS and Raman spectral analyzed the properties ofTiO2three-dimensional photonic crystals, such as morphology differences, ordering,crystallinity, etc.Secondly, using the Bragg scattering theory analyzed the band gap’s characteristics ofthree-dimensional photonic crystals. The changes of these characteristics were studied,when the beam’s incident angle changed, and compared these changes withone-dimensional photonic crystals’.Thirdly, this paper introduces the mechanism of interaction between laser and opticalmaterials and common method of testing materials’ laser damage threshold in briefly.Built a testing platform, and tested laser damage thresholds of PS photonic crystals,TiO2thin films, and TiO2three-dimensional photonic crystals. The changes of laserdamage thresholds of PS photonic crystals, TiO2three-dimensional photonic crystalsand TiO2/SiO2three-dimensional photonic crystals are studied, with the incident angle increaseing.In the end, changes of the temperatures with time on the substrates’ back of PSphotonic crystals, TiO2three-dimensional photonic crystals; TiO2/SiO2three-dimensional photonic crystals in different incidence angles were studied. The laserablation morphologies of PS photonic crystals, TiO2film and TiO2three-dimensionalphotonic crystals were analyzed. Analysis show that PS photonic crystal and TiO2film’sablations were mainly caused heated melting, and the ablations of TiO2three-dimensional photonic crystals were the result of coaction of melting and thermalstress cracking.