研究目的
To provide a comprehensive description of optical diffraction spectra of 2D dielectric photonic structures possessing low dielectric contrast.
研究成果
The study demonstrates that optical diffraction experiments offer a variety of information on the mechanisms of light scattering from 2D ordered and disordered dielectric photonic structures. The experiments visualized the diffraction patterns for 2D photonic structures on a flat screen, showing a crossover from Laue diffraction to speckle patterns with the introduction of disorder. The calculated results are in good agreement with experiment, and a tenfold orientational symmetry of the diffraction patterns of Penrose tilings was found.
研究不足
The study is limited to 2D photonic structures with low dielectric contrast and specific symmetry types. The experimental setup and analysis methods may not capture all optical phenomena in more complex or higher-dimensional structures.
1：Experimental Design and Method Selection:
The study employs the two-photon polymerization method, known as direct laser writing (DLW), for fabricating 2D photonic structures. The method is based on the nonlinear two-photon polymerization of a photosensitive material in the focus of a laser beam.
2：Sample Selection and Data Sources:
Samples were fabricated using a hybrid organic–inorganic material based on zirconium propoxide with an Irgacure 369 photo-initiator.
3：List of Experimental Equipment and Materials:
The installation and software from Laser Zentrum Hannover (Germany) were used. A 50 fs TiF-100F laser (Avesta-Project, Russia) was employed for polymerization.
4：Experimental Procedures and Operational Workflow:
Structures were fabricated by means of raster scanning in a layer-by-layer format.
5：Data Analysis Methods:
The diffraction patterns were analyzed using the Born approximation, focusing on the structure factor S(q).
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