Premium
Broadband Terahertz Circular‐Polarization Beam Splitter
Author(s) -
Lee Wendy S. L.,
Nirantar Shruti,
Headland Daniel,
Bhaskaran Madhu,
Sriram Sharath,
Fumeaux Christophe,
Withayachumnankul Withawat
Publication year - 2018
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201700852
Subject(s) - terahertz radiation , birefringence , circular polarization , broadband , optics , polarization (electrochemistry) , materials science , beam splitter , bandwidth (computing) , resonator , optoelectronics , physics , telecommunications , laser , microstrip , chemistry , computer science
Splitting circularly polarized waves is desirable for high‐data‐rate wireless communications and study of molecular chirality at terahertz frequencies. Typically, this functionality is achieved using bulk optical systems with limitations in material availability, bandwidth, and efficiency. As an alternative, metasurfaces with spatially varying broadband birefringence are employed to attain the same functionality. It is demonstrated that a metasurface designed with gradually rotated birefringent resonators can deflect normally incident left‐handed circularly polarized and right‐handed circularly polarized waves into different directions. This beam splitting functionality is maintained over an experimentally demonstrated relative deflection bandwidth of 53%, namely, covering the band of 0.58–1.00 THz.