Photonics Research, 2021, 9 (3): 03000308, Published Online: Feb. 24, 2021
Birefringent transmissive metalens with an ultradeep depth of focus and high resolution
Figures & Tables
Fig. 1. Schematic diagram of proposed birefringent metalens with ultradeep DOF. The incident linearly polarized electromagnetic wave can be decomposed into two orthogonal parts, i.e., the x E x y E y E x E y z E x E y
Fig. 2. Building blocks, and calculation and simulation results of relation between transmission amplitude and phase. (a) Schematic diagram of the triple-layered cross I-shaped meta-atom; (b) surface current distribution under the illumination of the x y l x l y
Fig. 3. Extinction cross-sectional spectra of the cross I-shaped meta-atoms in air for the x l x = l y = 3.5 mm l x ( l y )
Fig. 4. GSWm and the design process of the birefringent metalens. (a) Comparison of convergence characteristics under different values of p x y x y x o z E x E y E total calculated by Fresnel diffraction theory. The normalized intensity along the z x o z E x E y E total; (k) normalized intensity along the z
Fig. 5. Fabricated metalens and experiment results. (a) Experiment results of normalized intensities along the z E x E y E total; (b) normalized intensities of the total scattered field by calculation, simulation, and experiment; (c) fabricated sample of the designed metalens by GSWm; inset is a zoomed-in view of the prototype; normalized field-intensity distribution for (d) E x E y
Fig. 6. High transverse-resolution imaging simulation results. (a) Full-wave simulated results of normalized intensities along the z E total under the illumination of linearly polarized spherical wave with a polarization angle of 45° at 10 GHz; (b) square pattern consisting of four discrete points; simulated field distributions for E x E y E total when the square pattern is placed at (c)–(e)z = 400 mm z = 600 mm z = 1000 mm z = 1200 mm
Jiaran Qi, Yongheng Mu, Shaozhi Wang, Zhiying Yin, Jinghui Qiu. Birefringent transmissive metalens with an ultradeep depth of focus and high resolution[J]. Photonics Research, 2021, 9(3): 03000308.
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