School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States.
Nano Lett. 2012 Sep 12;12(9):4932-6. doi: 10.1021/nl302516v. Epub 2012 Aug 21.
The concept of optical phase discontinuities is applied to the design and demonstration of aberration-free planar lenses and axicons, comprising a phased array of ultrathin subwavelength-spaced optical antennas. The lenses and axicons consist of V-shaped nanoantennas that introduce a radial distribution of phase discontinuities, thereby generating respectively spherical wavefronts and nondiffracting Bessel beams at telecom wavelengths. Simulations are also presented to show that our aberration-free designs are applicable to high-numerical aperture lenses such as flat microscope objectives.
光学相位不连续性的概念被应用于无像差平面透镜和轴棱锥的设计和演示，这些元件由超薄膜层间距的光学天线相控阵组成。透镜和轴棱锥由 V 形纳米天线组成，引入了径向相位不连续性分布，从而在电信波长下分别产生了球面波前和无衍射贝塞尔光束。模拟结果还表明，我们的无像差设计适用于高数值孔径透镜，如平面显微镜物镜。
