A Tunable Dispersion-Free Terahertz Metadevice with Pancharatnam-Berry-Phase-Enabled Modulation and Polarization Control.

Cong, Longqing; Xu, Ningning; Han, Jiaguang; Zhang, Weili; Singh, Ranjan · Adv Mater · 2015

basic_science · Level V

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Abstract

It is extremely challenging to control the phase of light at will in free space. Here, Pancharatnam-Berry-phase-enabled, tunable phase control of free-space light is experimentally demonstrated in an ultrathin flexible dispersion-free metadevice. This metadevice enables the broadband conversion of linearly polarized light into any desired output polarization.