Design and fabrication of hierarchical microstructures for advanced optical applications

The design and fabrication of hierarchical microstructures are essential for advanced optical applications that require precise control over structural parameters at different scales, such as in photonic crystals, sensors, and light manipulation devices. This paper presents an approach using laser interference lithography (LIL) and direct laser writing (DLW) to create nanostructures with enhanced optical functionality. LIL enables the preparation of large-area periodic patterns, while DLW allows for high-resolution detailing, producing complex structures that integrate both micro- and nanoscale features. The experiments confirmed that the period and groove symmetry of LIL-patterned arbitrary surfaces can be adjusted by tilting the sample.