Study on focusing of wideband beam based on metasurface
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摘要: 超颖表面是一种基于亚波长结构的光学平板膜层，可在亚波长传输范围内调控入射光束的相位、振幅和偏振。为了代替传统的曲面光学元件，采用传输相位调控理论和广义折反射定律，设计了一种新型的超颖表面，并进行了程序模拟，取得了此亚波长结构对光束聚焦调控的数据。结果表明，当增加超颖表面的椭圆基元的长短轴长度时，材料的等效折射率增加，并且适用的波长范围增加到0.7μm~1.2μm；通过优化超表面结构参量，可实现在宽波带范围内的相位调控，进而获得聚焦光场的优化，在一定程度上可以代替传统光学元件实现光学聚焦。该研究结果在超分辨率成像及光刻等方面有一定参考价值，在一些特殊的需要亚波长结构调控光束的情况下可以使光路简单化，并且比传统的光学元件有着厚度方面的优势。Abstract: Meta-surface is optical flat film based on sub-wavelength structure, which can regulate phase, amplitude and polarization of incident beam in sub-wavelength range. In order to replace the traditional surface optical elements, one new type of mata-surface was designed by using the transmission phase regulation theory and the generalized reflection law. Program simulation was carried out and the data of beam focused and regulated by the sub-wavelength structure were obtained. The results show that, when the length of long and short axis of elliptical element of mata-surface is longer, equivalent refractive index of material increases at the same time and the applicable wavelength range increases to 0.7μm~1.2μm. By optimizing the mata-surface structure parameters, phase regulation within wide wave band can be realized, and the optimization of the focused light field can be obtained. To a certain extent, it can replace traditional optical elements to realize optical focusing. The results have some reference value in super-resolution imaging and photolithography. It can simplify the optical path in some special demands that sub-wavelength structure can regulate the beams. Compared with the traditional optical elements, mata-surface has the advantages of thickness.
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Figure 4. Light intensity distribution at different Dx and Dy (λ=915nm, f=40μm)
a—Dx=0.1μm, Dy=0.2μm b—Dx=0.15μm,
Dy=0.3μm c—Dx=0.1μm, Dy=0.3μm d—Dx=0.2μm, Dy=0.3μm![]()
Figure 9. Relationship of transmissivity, focal spot diameter and wavelength(Dx=0.1μm, Dy=0.2μm)
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Figure 10. Light intensity distributions at different wavelengths(Dx=0.15μm, Dy=0.3μm)
a—λ=0.7μm b—λ=0.8μm c—λ=0.915μm d—λ=1.0μm e—λ=1.1μm f—λ=1.2μm
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