Transformable Metasurfaces Enabled by Twisting Induced Nonlocality

Abstract

Reconfigurable optical interfaces with low power cost are of tremendous interest in imaging and communication applications. This work reveals the nonlocal effect in twisted electric dipoles and demonstrates its capability of non‐volatile transformation on scattering. When electric dipoles are rotated to form a tilted array, the dipolar resonances yield nonlocal interactions tuned by the rotation angle. The collective polarizability transformation maps to a series of circles crossing the origin of coordinates in the complex plane, providing 2π phase coverage and continuous amplitude modulation beyond the theoretical limit of an electric surface. Based on this mechanism, a Bluetooth‐driven nonlocal metasurface is developed for remote switching on scattering channels. Due to the stability of mechanical deformation, the twisted metasurface retains the stored functionality even after the power is removed. Our results offer a nonlocal route to transformable planar optics.

Off‐Resonance Spin‐Locked Metasurfaces Empowered by Quasi‐Bound States in the Continuum for Optical Analog Computing

“…[24] Through investigating the mechanisms of high order diffraction and phase gradient metagratings, the angle-dependent anomalous reflection and refraction with almost unity efficiency can be reached. [16,25,26] Given the merits of robust resonance and high quality (Q) factor, the bound state in the continuum (BIC) is attracting growing interest and experiencing a research upsurge in metasurfaces studies. [27] A true BIC would possess infinite mode lifetime and quality factor, and it cannot be observed in spectrum because it confines the light perfectly without any radiation leaking out.…”

“…[ 24 ] Through investigating the mechanisms of high order diffraction and phase gradient metagratings, the angle‐dependent anomalous reflection and refraction with almost unity efficiency can be reached. [ 16,25,26 ]…”