中国光学2023，Vol.16Issue(4)：889-903,15.DOI:10.37188/CO.2022-0228
角度复用的光学加密超表面的超快激光嵌套加工方法研究
Angle-multiplexed optically encrypted metasurfaces fabricated by ultrafast laser induced spatially selective-modified nanograting structures
摘要
Abstract
The optical encrypted metasurface based on one-dimensional grating diffraction requires the pro-cessing of mask or unit structure one by one,resulting in low efficiency.In addition,the poor uniformity of the structure formed by conventional ablated LIPSS can also affect device performance.Aming at the above problems,an optical metasurfaces processing method is proposed based on modified structures obtained by picosecond laser direct writing phase-change material Ge2Sb2Te5.Firstly,the dispersion properties of the pre-pared GST-modified gratings are first characterized,and the angle-multiplexed information encryption metasurfaces are designed by combining the polarization dependence of the modified grating,and the metas-urface prepared by the proposed method is further demonstrated.In addition,the performance of encryption under natural light conditions and selective decryption reading and dynamic display under strong light condi-tions has been achieved.Compared to the conventional processing method,the proposed method can gener-ate a series of grating structures in the form of simultaneous printing in a direct writing process,which im-proves the processing efficiency.At the same time,the grating structure obtained by processing has good uni-formity and consistency,which improves the color rendering effect.A modified grating with an orientation angle difference of 16° is used to realize selective information reading without crosstalk resulting in uniform and bright structural colors.The processing strategy proposed in this paper has a profound application pro-spect in the fields of anti-counterfeiting,information encryption storage and wearable flexible display devices.关键词
超快激光/相变材料/信息加密/光栅结构Key words
ultrafast laser/phase-change material/information encryption/grating structure分类
信息技术与安全科学引用本文复制引用
张晓斌,韩伟娜..角度复用的光学加密超表面的超快激光嵌套加工方法研究[J].中国光学,2023,16(4):889-903,15.基金项目
国家重大研发计划(No.2022YFB4602900) （No.2022YFB4602900）
重庆市自然科学基金(No.cstc2021jcyj-cxttX0003,No.CSTB2022NSCQ-MSX1322) （No.cstc2021jcyj-cxttX0003,No.CSTB2022NSCQ-MSX1322）
国家自然科学基金(No.52005041,No.52235009)Supported by National Key R&D Program of China(No.2022YFB4602900) （No.52005041,No.52235009）
Chongqing Natural Science Foundation of China(No.cstc2021jcyj-cxttX0003,No.CSTB2022NSCQ-MSX1322) （No.cstc2021jcyj-cxttX0003,No.CSTB2022NSCQ-MSX1322）
National Natural Sci-ence Foundation of China(NSFC)(No.52005041,No.52235009) （NSFC）
