Achieving high-level integration of composite micro-nano structures with different structural characteristics through a minimalist and universal process has long been the goal pursued by advanced manufacturing researc...Achieving high-level integration of composite micro-nano structures with different structural characteristics through a minimalist and universal process has long been the goal pursued by advanced manufacturing research but is rarely explored due to the absence of instructive mechanisms.Here,we revealed a controllable ultrafast laser-induced focal volume light field and experimentally succeeded in highly efficient one-step composite structuring in multiple transparent solids.A pair of spatially coupled twin periodic structures reflecting light distribution in the focal volume are simultaneously created and independently tuned by engineering ultrafast laser-matter interaction.We demonstrated that the generated composite micro-nano structures are applicable to multi-dimensional information integration,nonlinear diffractive elements,and multi-functional optical modulation.This work presents the experimental verification of highly universal all-optical fabrication of composite micro-nano structures with independent controllability in multiple degrees of freedom,expands the current cognition of ultrafast laser-based material modification in transparent solids,and establishes a new scientific aspect of strong-field optics,namely,focal volume optics for composite structuring transparent solids.展开更多
Rendering translucent materials is costly:light transport algorithms need to simulate a large number of scattering events inside the material before reaching convergence.The cost is especially high for materials with ...Rendering translucent materials is costly:light transport algorithms need to simulate a large number of scattering events inside the material before reaching convergence.The cost is especially high for materials with a large albedo or a small mean-freepath,where higher-order scattering effects dominate.In simple terms,the paths get lost in the medium.Path guiding has been proposed for surface rendering to make convergence faster by guiding the sampling process.In this paper,we introduce a path guiding solution for translucent materials.We learn an adaptive approximate representation of the radiance distribution in the volume and use it to sample the scattering direction,combining it with phase function sampling by resampled importance sampling.The proposed method significantly improves the performance of light transport simulation in participating media,especially for small lights and media with refractive boundaries.Our method can handle any homogeneous participating medium,with high or low scattering,with high or low absorption,and from isotropic to highly anisotropic.展开更多
基金financially supported by the National Key Research and Development Program of China(No.2021YFB2802001)the National Natural Science Foundation of China(Grant Nos.12304349,U20A20211,62275233)the Postdoctoral Fellowship Program of CPSF(GZB20230628,GZC20241465)。
文摘Achieving high-level integration of composite micro-nano structures with different structural characteristics through a minimalist and universal process has long been the goal pursued by advanced manufacturing research but is rarely explored due to the absence of instructive mechanisms.Here,we revealed a controllable ultrafast laser-induced focal volume light field and experimentally succeeded in highly efficient one-step composite structuring in multiple transparent solids.A pair of spatially coupled twin periodic structures reflecting light distribution in the focal volume are simultaneously created and independently tuned by engineering ultrafast laser-matter interaction.We demonstrated that the generated composite micro-nano structures are applicable to multi-dimensional information integration,nonlinear diffractive elements,and multi-functional optical modulation.This work presents the experimental verification of highly universal all-optical fabrication of composite micro-nano structures with independent controllability in multiple degrees of freedom,expands the current cognition of ultrafast laser-based material modification in transparent solids,and establishes a new scientific aspect of strong-field optics,namely,focal volume optics for composite structuring transparent solids.
基金partially supported by the NationalKey R&D Program of China under Grant No.2017YFB0203000the National Natural Science Foundation of China under Grant Nos.61802187 and 61872223+2 种基金the Natural Science Foundation of Jiangsu under Grant No.BK20170857the fundamental research funds for the central universities No.30918011320ANR project ANR-15-CE380005“Materials”.
文摘Rendering translucent materials is costly:light transport algorithms need to simulate a large number of scattering events inside the material before reaching convergence.The cost is especially high for materials with a large albedo or a small mean-freepath,where higher-order scattering effects dominate.In simple terms,the paths get lost in the medium.Path guiding has been proposed for surface rendering to make convergence faster by guiding the sampling process.In this paper,we introduce a path guiding solution for translucent materials.We learn an adaptive approximate representation of the radiance distribution in the volume and use it to sample the scattering direction,combining it with phase function sampling by resampled importance sampling.The proposed method significantly improves the performance of light transport simulation in participating media,especially for small lights and media with refractive boundaries.Our method can handle any homogeneous participating medium,with high or low scattering,with high or low absorption,and from isotropic to highly anisotropic.
