All-optical active THz metasurfaces for ultrafast polarization switching and dynamic beam splitting

Longqing Cong; Yogesh Kumar Srivastava; Huifang Zhang; Xueqian Zhang; Jiaguang Han; Ranjan Singh

doi:10.1038/s41377-018-0024-y

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All-optical active THz metasurfaces for ultrafast polarization switching and dynamic beam splitting

Original Articles

- All-optical active THz metasurfaces for ultrafast polarization switching and dynamic beam splitting
- Light: Science & Applications Vol. 7, Issue 4, Pages: 228-236(2018)
- Affiliations：
  
  1.Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore
  2.Centre for Disruptive Photonic Technologies, The Photonics Institute, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
  3.Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering, Key Laboratory of Optoelectronic Information Technology, Ministry of Education, Tianjin University, 300072 Tianjin, People's Republic of China
- Author bio：
  
  Ranjan Singh (ranjans@ntu.edu.sg)
- Funds：
- DOI：10.1038/s41377-018-0024-y
  CLC：
- Published：2018，
  
  Published Online：04 July 2018，
  
  Received：21 November 2017，
  
  Revised：27 March 2018，
  
  Accepted：22 April 2018
- Accepted：
Scan QR Code
Cong, L. Q. et al. All-optical active THz metasurfaces for ultrafast polarization switching and dynamic beam splitting. Light: Science & Applications, 4, 228-236 (2018).
DOI：

Cong, L. Q. et al. All-optical active THz metasurfaces for ultrafast polarization switching and dynamic beam splitting. Light: Science & Applications, 4, 228-236 (2018). DOI： 10.1038/s41377-018-0024-y.

摘要

Abstract

Miniaturized ultrafast switchable optical components with an extremely compact size and a high-speed response will be the core of next-generation all-optical devices instead of traditional integrated circuits

which are approaching the bottleneck of Moore's Law. Metasurfaces have emerged as fascinating subwavelength flat optical components and devices for light focusing and holography applications. However

these devices exhibit a severe limitation due to their natural passive response. Here we introduce an active hybrid metasurface integrated with patterned semiconductor inclusions for all-optical active control of terahertz waves. Ultrafast modulation of polarization states and the beam splitting ratio are experimentally demonstrated on a time scale of 667 ps. This scheme of hybrid metasurfaces could also be extended to the design of various free-space all-optical active devices

such as varifocal planar lenses

switchable vector beam generators

and components for holography in ultrafast imaging

display

and high-fidelity terahertz wireless communication systems.

关键词

Keywords

references

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