In this work, a 3D IR artificial compound eye (ACE) optical component is fabricated using thermoplastic IR polymer material. The femtosecond laser-assisted wet etching and the 3D nano-imprinting techniques are proposed for fabricating this thin shell multi-aperture component. The prepared component is close-packed with over 1000 high-quality micro-facet-lenslets (ommatidia) on the semispherical thin shell dome with base radius of 2.7 mm and sag height of 2.1 mm, enabling enlarged field of view to 148°. The ommatidia with diameter of 150 µm and numerical aperture of 0.35 are demonstrated to have a practical spatial resolution up to 160 lp mm −1 . IR imaging experiments (both in passive and active scenarios) confirm its outstanding optical properties and uniformity, and demonstrate the probability of thermal target imaging with such component in the near-infrared band. The proposed fabrication strategy shows remarkable efficiency and advantage in massive replication, and such ACE component predicts its potential in emerging applications, such as IR imaging, target tracking, and so on.
Yi Pan,Chang Li,Xiaoyu Hou,Zhenyu Yang,Mingzhu Li,Ho Cheung Shum
Stimuli-responsive structural coloration allows the color change of soft substrates in response to environmental stimuli such as heat, humidity, and solvents. Such color-changing systems enable smart soft devices, such as the camouflageable skin of soft robots or chromatic sensors in wearable devices. However, individually and independently programmable stimuli-responsive color pixels remain significant challenges among the existing color-changing soft materials and devices, which are crucial for dynamic display. Inspired by the dual-color concavities on butterfly wings, a morphable concavity array to pixelate the structural color of two-dimensional photonic crystal elastomer and achieve individually and independently addressable stimuli-responsive color pixels is designed. The morphable concavity can convert its surface between concave and flat upon changes in the solvent and temperature, accompanied by angle-dependent color-shifting. Through multichannel microfluidics, the color of each concavity can be controllably switched. Based on the system, the dynamic display by forming reversibly editable letters and patterns for anti-counterfeiting and encryption are demonstrated. It is believed that the strategy of pixelating optical properties through locally altering surface topography can inspire the design of new transformable optical devices, such as artificial compound eyes or crystalline lenses for biomimetic and robotic applications.
危险品化学品经营许可证（带存储）