This supplementary material provides detailed optical simulations, fabrication methods, and characterization results for a self-assembled skin-like metamaterial designed for dual-band camouflage. The NPAHP-based hierarchical structure, which consists of Au nanoparticles (NPs), pillars, and a filling ratio of Au, is explored using the FDTD method to simulate its optical properties in different bands. Key findings include: 1. **Optical Simulations**: The simulations show that the LSPR effect of Au NPs dominates the visible absorption, with absorption performance influenced by particle size distribution. The structure's ability to couple light and enhance visible absorptivity is demonstrated through simulations of three-dimensional pillar structures. 2. **Fabrication of the NPAHP-based Camouflage Film**: A two-step template method is used to fabricate the hierarchical structure, involving the deposition of Au clusters in AAO templates with different pore sizes. 3. **Characterization**: - **SEM Characterization**: SEM images show the distribution of Au NPs within nanopores in AAO templates. - **Absorption Spectra**: High absorption in the infrared band is observed for all samples due to the AAO template. - **Complete Etching**: XPS analysis confirms the complete removal of the AAO template during etching. - **Adhesiveness and Air Permeability**: The NPAHP-120 film exhibits good adhesiveness and air permeability similar to commercial cotton. - **Durability**: The film maintains its optical properties over one month under various environmental conditions and after 100 folds. - **Energy Contribution**: Calculations show the energy contribution to detected power by the infrared camera, considering radiative and reflective powers. - **Absorption Spectra in Different States**: The NPAHP-120 film remains stable after coating with and annealing under SnO₂. The supplementary material also includes references to recent works on multi-spectral camouflage materials, providing a comprehensive background for the research.This supplementary material provides detailed optical simulations, fabrication methods, and characterization results for a self-assembled skin-like metamaterial designed for dual-band camouflage. The NPAHP-based hierarchical structure, which consists of Au nanoparticles (NPs), pillars, and a filling ratio of Au, is explored using the FDTD method to simulate its optical properties in different bands. Key findings include: 1. **Optical Simulations**: The simulations show that the LSPR effect of Au NPs dominates the visible absorption, with absorption performance influenced by particle size distribution. The structure's ability to couple light and enhance visible absorptivity is demonstrated through simulations of three-dimensional pillar structures. 2. **Fabrication of the NPAHP-based Camouflage Film**: A two-step template method is used to fabricate the hierarchical structure, involving the deposition of Au clusters in AAO templates with different pore sizes. 3. **Characterization**: - **SEM Characterization**: SEM images show the distribution of Au NPs within nanopores in AAO templates. - **Absorption Spectra**: High absorption in the infrared band is observed for all samples due to the AAO template. - **Complete Etching**: XPS analysis confirms the complete removal of the AAO template during etching. - **Adhesiveness and Air Permeability**: The NPAHP-120 film exhibits good adhesiveness and air permeability similar to commercial cotton. - **Durability**: The film maintains its optical properties over one month under various environmental conditions and after 100 folds. - **Energy Contribution**: Calculations show the energy contribution to detected power by the infrared camera, considering radiative and reflective powers. - **Absorption Spectra in Different States**: The NPAHP-120 film remains stable after coating with and annealing under SnO₂. The supplementary material also includes references to recent works on multi-spectral camouflage materials, providing a comprehensive background for the research.