Terahertz Metagrating Emitters with Beam Steering and Full Linear Polarization Control

Cormac McDonnell, Junhong Deng, Symeon Sideris, Guixin Li, Tal Ellenbogen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


We report the realization of broadband THz plasmonic metagrating emitters for simultaneous beam steering and all-optical linear polarization control. Two types of metagratings are designed and experimentally demonstrated. First, the plasmonic meta-Atoms are arranged in a metagrating with a binary phase modulation which results in the nonlinear generation of THz waves to the ±1 diffraction orders, with complete suppression of the zeroth order. Complete tunability of the diffracted THz linear polarization direction is demonstrated through simple rotation of the pump polarization. Then, the concept of lateral phase shift is introduced into the design of the metagratings using interlaced phase gradients. By controlling the spatial shift of the submetagrating, we are able to continuously control the linear polarization states of the generated THz waves. This method results in a higher nonlinear diffraction efficiency relative to binary phase modulation. These functional THz metagratings show exciting promise to meet the challenges associated with the current diverse array of applications utilizing THz technology.

Original languageEnglish
Pages (from-to)2603-2610
Number of pages8
JournalNano Letters
Issue number7
StatePublished - 13 Apr 2022


FundersFunder number
Guangdong Provincial Innovation and Entrepreneurship Project2017ZT07C071
NSFC-ISF12161141010, 3450/21
Natural Science Foundation of Shenzhen Innovation CommissionJCYJ20200109140808088
Horizon 2020 Framework Programme715362
European Research Council
National Natural Science Foundation of China91950114, 11774145


    • Beam steering
    • Nonlinear metasurface
    • Pancharatnam-Berry phase
    • Polarization control
    • Terahertz (THz)


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