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为了实现轻量化的大数值孔径红外透镜,基于模式耦合理论,建立了金属薄膜上方形孔对入射光场相位调制与方孔边长尺寸、深度的关系,在此基础上,提出了一种可实现大数值孔径的亚波长金属结构薄膜透镜。采用数值模拟方法对此透镜的聚焦特性进行了模拟仿真,结果表明:对于10.6μm的入射波长,口径尺寸为300μm的透镜可实现半高全宽仅为4μm的聚焦光斑,其等效的数值孔径高达3.3,充分证明了这类透镜在实现大数值孔径方面的优势,为设计轻量化的高分辨红外光学元件提供了新的方法。
In order to realize a large numerical aperture infrared lens with a light weight, based on the mode coupling theory, the relationship between the phase modulation of the incident light field and the size and depth of the square hole is established. Based on this, Sub-Wavelength Metal Structure Film Lenses for Large Numerical Apertures. The numerical simulation method is used to simulate the focusing characteristics of the lens. The results show that for the incident wavelength of 10.6μm, the lens with the aperture of 300μm can achieve the full-width half maximum width of only 4μm and the equivalent numerical aperture up to 3.3 , Which fully demonstrates the advantages of this type of lens in achieving large numerical aperture. It provides a new method for designing lightweight high-resolution infrared optical components.