Design for quality: reconfigurable flat optics based on active metasurfaces

Nanophotonics

Fowler Clayton¹  Zhang Hualiang¹  An Sensong¹  Zheng Bowen¹  Wu Yuhao²  Campbell Sawyer D.²  Werner Douglas H.²  Whiting Eric B.²  Kang Lei²  Zhang Yifei³  Ríos Carlos³  Shalaginov Mikhail Y.³  Hu Juejun³  Gu Tian⁴ 

[1] Department of Electrical & Computer Engineering, University of Massachusetts Lowell, Lowell, MA01854, USA;Department of Electrical Engineering, Pennsylvania State University, University Park, PA16802, USA;Department of Materials Science & Engineering, Massachusetts Institute of Technology, Cambridge, MA02139, USA;Materials Research Laboratory, Massachusetts Institute of Technology, Cambridge, MA02139, USA;

关键词: deep neural network;    inverse design;    metasurface;    meta-optics;    phase-change material;    reconfigurable;   

DOI  :  10.1515/nanoph-2020-0033

来源: DOAJ

【 摘 要 】

Optical metasurfaces, planar subwavelength nanoantenna arrays with the singular ability to sculpt wavefront in almost arbitrary manners, are poised to become a powerful tool enabling compact and high-performance optics with novel functionalities. A particularly intriguing research direction within this field is active metasurfaces, whose optical response can be dynamically tuned postfabrication, thus allowing a plurality of applications unattainable with traditional bulk optics. Designing reconfigurable optics based on active metasurfaces is, however, presented with a unique challenge, since the optical quality of the devices must be optimized at multiple optical states. In this article, we provide a critical review on the active meta-optics design principles and algorithms that are applied across structural hierarchies ranging from single meta-atoms to full meta-optical devices. The discussed approaches are illustrated by specific examples of reconfigurable metasurfaces based on optical phase-change materials.

【 授权许可】

Unknown