Longitudinal Multifoci Metalens for Circularly Polarized Light
By Xianzhong Chen, Ming Chen, M. Mehmood, Dandan Wen, Fuyong Yue, Cheng-Wei Qiu, Shuang Zhang. 2015
227 citations recorded by the source corpus.
As a fundamental optical device, a lens lies in the heart of many important applications in various scientifi c communities such as physics, optics, biology, medicine, and security. People have been fascinated by using different technologies to develop lenses with unusual features, such as ultrathin metalenses based on metasurface [ 27,28,39,40 ] and multifoci diffractive lenses [ 41,42 ] based on diffraction optics. A multifoci diffractive lens allows a single incident beam to focus at different positions along the longitudinal axis or along the transverse direction, which has been widely used in imaging systems, detectors, optical data storage, laser printing and optical freespace communications. [ 41–44 ] However, all the polarization states of the focal points are the same as that of the incident light. Moreover, the traditional method to design and fabricate such a lens is based on diffractive optics, thus the thickness is much larger than the wavelength of light. While there has been great progress in the miniaturization of optical lenses by using metasurfaces, much attention has been paid to constructing a lens with a single focal point by using different geometry structures such as V-shape, [ 22,23,45,46 ] nanorods, [ 27,32,36 ] and nanoslits. [ 47 ] Although the work on metasurface lenses is in its infancy, it offers in the long run major opportunities if multifunction nanostructured lenses can be experimentally realized in ultrathin and fl at confi gurations. Here, we apply the concept of controllable interfacial phase discontinuity to realize an ultrathin fl at metasurface lens with multiple focal points along the longitudinal direction. Unlike the traditional multifoci diffractive lenses, the position and the polarization of the focal points can be controlled by changing the helicity of the incident light. Furthermore, the developed devices are ultrathin (40 nm) and planar, which can facilitate the system integration. Figure 1 shows the schematic of the plasmonic metasurface lens. It consists of nanorods with spatially varying orientation in three different regions marked by I, II, and III, as shown in Figure 1 a. The radius of region I (R-I) is r 1 , and the inner radius and outer radius of region II (R-II) are r 1 and r 2 . r 2 and r 3 are the inner radius and outer radius of region III (R-III). The relationship among r 1 , r 2 , and r 3 is governed by
Subfields: Aerospace Engineering, Electronic, Optical and Magnetic Materials
View Paper: https://www.semanticscholar.org/paper/136bfcf13f6bb1f6ca8ac987fd065c13a13ea995
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Citations in the corpus
- Photonic spin Hall effect in metasurfaces: a brief review (2017, background): “Figure 16A shows the schematic metasurface lens with three different focal points along the longitudinal direction [133].”
- Multifunctional Microstrip Array Combining a Linear Polarizer and Focusing Metasurface (2016, background): “A set of functional devices [13]–[18] with wave bending, focusing, and even polarization control have been extensively studied from microwave [15]–[18] to terahertz regions [14], and even to IR/optical frequencies [12], [13], for their anomalous electromagnetic (EM) properties.”