title: Metallic cylindrical focusing micromirrors with long axial focal depth or increased lateral resolution.
abstract: Using a general focal-length function, two-dimensional long-focal-depth (LFD) metallic cylindrical focusing micromirrors (MCFMs) are designed and the focal performance is systematically investigated based on rigorous electromagnetic theory and the boundary element method. For a positive preset focal depth, simulation results reveal that the designed MCFMs still possess an LFD property and high lateral resolution even when the f-number is reduced to f/0.3. On the other hand, through setting the preset focal depth to be negative, increased lateral resolution is obtained, compared with the conventional MCFM. In addition, under multiwavelength illumination, a large common LFD region is demonstrated for the designed LFD MCFMs, which is due to the intrinsic achromatic property of reflective systems.
authors.affiliation: Department of Physics, Capital Normal University, Beijing 100048, China.
authors.forename: Guo-Ai
authors.initials: GA
authors.lastname: Mei
authors.forename: Jia-Sheng
authors.initials: JS
authors.lastname: Ye
authors.forename: Yan
authors.initials: Y
authors.lastname: Zhang
authors.forename: Jie
authors.initials: J
authors.lastname: Lin