用于在可见光波长范围内具有亚波长分辨率的成像的优化的低损耗多层膜
Optimised low-loss multilayers for imaging with sub-wavelength resolution in the visible wavelength range
摘要：
我们优化了Ag-TiO 2，Ag-SrTiO 3和Ag-GaP多层膜的有效趋肤深度和分辨率，用于亚波长分辨率的成像。在传输和分辨率方面，优化的多层膜优于基于有效介质理论、阻抗匹配和法布里-珀罗谐振的组合使用的简单设计。例如，仅由17层组成的优化的Ag-GaP多层，在490 nm的波长下工作并且具有等于一个波长的总厚度，将78%的强度透射与60 nm的分辨率相结合。它还表明，使用的有效介质理论导致次优的多层设计相对于集肤深度和分辨率之间的权衡已经当该结构的周期是在40 nm或更大的顺序。
英文摘要：
We optimise the effective skin-depth and resolution of Ag-TiO2, Ag-SrTiO3, and Ag-GaP multilayers for imaging with sub-wavelength resolution. In terms of transmission and resolution the optimised multilayers outperform simple designs based on combined use of effective medium theory, impedance matching and Fabry-Perot resonances. For instance, an optimised Ag-GaP multilayer consisting of only 17 layers, operating at the wavelength of 490 nm and having a total thickness equal to one wavelength, combines 78% intensity transmission with a resolution of 60 nm. It is also shown that use of the effective medium theory leads to sub-optimal multilayer designs with respect to the trade-off between the skin depth and resolution already when the period of the structure is on the order of 40 nm or larger.
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