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银金属在特定波长范围内的负折射率性质可以放大倏逝波,在近场成像中能够保留次波长信息,因此是制造“完美透镜”的优良材料。由银金属和其他介质组成的复合材料能够通过其调整体积分数来改变“完美透镜”的工作波长,使其在可见光和近红外范围内实现完美成像。除体积分数外,复合材料中金属颗粒的大小和形状也会对透镜的工作波长和成像质量有影响。在考虑尺寸效应修正的基础上,通过分析尺寸对成像性质的影响发现:减小金属颗粒尺寸会使工作波长发生蓝移,当银颗粒尺寸减小到10nm时,会显著降低成像质量。
The negative refractive index properties of silver metal can amplify the evanescent wave in a specific wavelength range and preserve the sub-wavelength information in near-field imaging, making it an excellent material for making “perfect lens”. Composites made of silver metal and other media allow the “perfect lens” operating wavelength to be changed by adjusting the volume fraction, enabling perfect imaging in the visible and near infrared range. In addition to the volume fraction, the size and shape of the metal particles in the composite also have an effect on the working wavelength and imaging quality of the lens. Based on the correction of the size effect, the influence of the size on the imaging properties was analyzed. It was found that reducing the size of the metal particles caused a blue shift of the working wavelength. When the size of the silver particles was reduced to 10 nm, the imaging quality was significantly reduced.