0.2 0 Thick Adaptive Retroreflector Made of Spin-Locked Metasurface. Academic Article uri icon


  • The metasurface concept is employed to planarize retroflectors by stacking two metasurfaces with separation that is two orders larger than the wavelength. Here, a retroreflective metasurface using subwavelength-thick reconfigurable C-shaped resonators (RCRs) is reported, which reduces the overall thickness from the previous record of 590 0 down to only 0.2 0 . The geometry of RCRs could be in situ controlled to realize equal amplitude and phase modulation onto transverse magnetic (TM)-polarized and transverse electric (TE)-polarized incidences. With the phase gradient being engineered, an in-plane momentum could be imparted to the incident wave, guaranteeing the spin state of the retro-reflected wave identical to that of the incident light. Such spin-locked metasurface is natively adaptive toward different incident angles to realize retroreflection by mechanically altering the geometry of RCRs. As a proof of concept, an ultrathin retroreflective metasurface is validated at 15 GHz, under various illumination angles at 10, 12, 15, and 20. Such adaptive spin-locked metasurface could find promising applications in spin-based optical devices, communication systems, remote sensing, RCS enhancement, and so on.

published proceedings

  • Adv Mater

author list (cited authors)

  • Yan, L., Zhu, W., Karim, M. F., Cai, H., Gu, A. Y., Shen, Z., ... Liu, A. Q.

complete list of authors

  • Yan, Libin||Zhu, Weiming||Karim, Muhammad Faeyz||Cai, Hong||Gu, Alex Yuandong||Shen, Zhongxiang||Chong, Peter Han Joo||Kwong, Dim-Lee||Qiu, Cheng-Wei||Liu, Ai Qun

publication date

  • September 2018