Bio-inspired microstructures for enhancement of surface photothermal absorption based on TPP

The microstructures on the wing scales of some butterflies demonstrate excellent optical properties in response to environmental changes. The preparation of nature-inspired photothermal conversion structures on material surfaces has now been successfully applied to microelectronics. However, conventional methods are limited by processing accuracy, which makes it difficult to truly replicate the bionic microstructures perfectly, and few studies have been conducted to prepare bionic structures on transparent materials to obtain enhanced photothermal conversion properties. In this paper, we prepared bionic microstructures on the surface of hydrogels by two-photon polymerization technique. The original recipes of temperature-sensitive hydrogels were also enhanced in terms of performance. The structure of the scale surface for enhanced photothermal conversion was analyzed by morphological and spectral characterization of different regions of Papilio maackii scales. Moreover, a microstructure was simplified and designed, and the absorption properties of the structure for 800 nm laser were demonstrated by fdtd simulation. Further, we utilize this bionic microstructure prepared on the surface of the microblock to achieve more rapid and efficient driven deformation of the bilayer film heterostructure through two-photon aggregation absorption for photothermal conversion. Our proposed method provides a novel approach for the design of a new generation of flexible electronic, micro-drives.