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

1. Longqing Cong^1,2, 
2. Ningning Xu³,
3. Jiaguang Han⁴, 
4. Weili Zhang^3,*and
5. Ranjan Singh^1,2,*

Article first published online: 30 SEP 2015

DOI: 10.1002/adma.201502716

© 2015 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

http://onlinelibrary.wiley.com/doi/10.1002/adma.201502716/abstract;jsessionid=B2BDAF5543D657CCE7DA838DC3777D2E.f04t03?userIsAuthenticated=false&deniedAccessCustomisedMessage=

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.