Full-visible achromatic imaging with a single dual-pinhole-coded diffractive photon sieve.
Full-visible achromatic imaging with a single dual-pinhole-coded diffractive photon sieve.
复制标题
DOI：
10.1364/oe.433272
复制
发表时间：
2021-08
期刊：
影响因子：
3.8
通讯作者：
Chuan Wang;Ti Sun;D. Pu;Feng Xu;Chinhua Wang
中科院分区：
文献类型：
--
作者：
Chuan Wang;Ti Sun;D. Pu;Feng Xu;Chinhua Wang
传统的衍射光学元件由于其严重色散的性质而遭受大的色差，使得它们只能工作在接近零带宽的单个波长。在这里，我们提出并实验证明了在全可见光波长范围内的消色差成像与一个单一的双针孔编码衍射光子筛（PS）。针孔图案（即，每个针孔的位置和尺寸的分布）是通过双波长复用编码（WMC）和波前编码（WFC）产生的，其中WMC使在整个可见光范围内最佳选择的多个波长相干聚焦在共同的设计焦距上，而WFC扩展了在每个所选波长处的衍射成像的带宽。数值模拟表明，当七个波长（即，484.8、515.3、547.8、582.4、619.1、658.1和699.5 nm），并采用立方波阵面编码参数α = 30π，可获得可见光全波段的宽带消色差成像。实验制作的建议的双针孔编码PS的焦距为500 mm，直径为50 mm的使用无掩模紫外光刻。实验成像结果与数值计算结果一致。该工作为实现全可见光范围内的消色差成像提供了一种新颖实用的方法，具有薄、轻、平的特点。
Conventional diffractive optical elements suffer from large chromatic aberration due to its nature of severe dispersion so that they can only work at a single wavelength with near zero bandwidth. Here, we propose and experimentally demonstrate an achromatic imaging in the full-visible wavelength range with a single dual-pinhole-coded diffractive photon sieve (PS). The pinhole pattern (i.e., distribution of the position and size of each pinhole) is generated with dual wavelength-multiplexing coding (WMC) and wavefront coding (WFC), in which WMC makes multiple wavelengths that are optimally selected within the full visible range focus coherently on a common designed focal length while WFC expands the bandwidth of the diffracted imaging at each of the selected wavelengths. Numerical simulations show that when seven wavelengths (i.e., 484.8, 515.3, 547.8, 582.4, 619.1, 658.1 and 699.5 nm) within the visible range between 470 nm to 720 nm and a cubic wavefront coding parameter α = 30π are selected, a broadband achromatic imaging can be obtained within the full range of visible wavelength. Experimental fabrication of the proposed dual-pinhole-coded PS with a focal length of 500 mm and a diameter of 50 mm are performed using the mask-free UV-lithography. The experimental imaging results agree with the numerical results. The demonstrated work provides a novel and practical way for achieving achromatic imaging in the full visible range with features of thin, light and planar.