Traditionally,magic cube configurations,which have been employed to mechanically execute diverse and unconventional structural transformations,are capable of significantly boosting versatile electromagnetic responses ...Traditionally,magic cube configurations,which have been employed to mechanically execute diverse and unconventional structural transformations,are capable of significantly boosting versatile electromagnetic responses of reconfigurable metamaterials.However,this idea is still in the initial exploration stage and faces many constraints.Here,we propose magic cube metamaterials with features of high transparency,multi-gradient phase distribution,full polarization,and high information,which manifest 47.58% optical transmittance,a 6-order phase distribution,a 77% fractional operating bandwidth,and 65.23 times information entropy of their planar counterparts.The reflection phase corresponding to coplanar lattice of the metamaterials can be dynamically and omni-directionally controlled via altering their spatial distributions through individually addressing each rotatable meta-particle while maintaining the polarization states.The optically transparent design allows for real-time visual interaction and sequence mapping of the reconfigurable metamaterials.As two proof-of-concept meta-devices,an achromatic metalens with an unchanged focal length and a switchable multi-functional beam generator is demonstrated by simulations and experiments in an ultra-wide band(8.0-18.0 GHz).This work provides an effective alternative for designing reconfigurable metamaterials with high information-entropy properties,paving a new route toward advanced equipment such as active signal processors and information encryption/decryption systems.展开更多
介绍了非线性动力学系统的 L ogistic映射形成混沌序列的方法 ,提出了一种新的置乱方法 :魔方变换。设计了基于魔方变换的图像加密 /解密算法 ,首先由 L ogistic映射生成得到自然数混沌序列 ,以此序列为参数对图像矩阵进行魔方置乱后得...介绍了非线性动力学系统的 L ogistic映射形成混沌序列的方法 ,提出了一种新的置乱方法 :魔方变换。设计了基于魔方变换的图像加密 /解密算法 ,首先由 L ogistic映射生成得到自然数混沌序列 ,以此序列为参数对图像矩阵进行魔方置乱后得到加密图像 ,逆过程即是解密算法。展开更多
基金supported by the National Key Research and Development Program of China(SQ2022YFB3806200)the Shaanxi Province Innovation Capability Promotion Plan(2023-CX-TD-48)+2 种基金the National Natural Science Foundation of China(62401614,62401617)the China Postdoctoral Science Foundation(2023M734275)the Postdoctoral Fellowship Program of China Postdoctoral Science Foundation(GZC20233576)。
文摘Traditionally,magic cube configurations,which have been employed to mechanically execute diverse and unconventional structural transformations,are capable of significantly boosting versatile electromagnetic responses of reconfigurable metamaterials.However,this idea is still in the initial exploration stage and faces many constraints.Here,we propose magic cube metamaterials with features of high transparency,multi-gradient phase distribution,full polarization,and high information,which manifest 47.58% optical transmittance,a 6-order phase distribution,a 77% fractional operating bandwidth,and 65.23 times information entropy of their planar counterparts.The reflection phase corresponding to coplanar lattice of the metamaterials can be dynamically and omni-directionally controlled via altering their spatial distributions through individually addressing each rotatable meta-particle while maintaining the polarization states.The optically transparent design allows for real-time visual interaction and sequence mapping of the reconfigurable metamaterials.As two proof-of-concept meta-devices,an achromatic metalens with an unchanged focal length and a switchable multi-functional beam generator is demonstrated by simulations and experiments in an ultra-wide band(8.0-18.0 GHz).This work provides an effective alternative for designing reconfigurable metamaterials with high information-entropy properties,paving a new route toward advanced equipment such as active signal processors and information encryption/decryption systems.
