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
Ranjan Singh (ranjans@ntu.edu.sg)
纸质出版日期:2018,
网络出版日期:2018-07-04,
收稿日期:2017-11-21,
修回日期:2018-03-27,
录用日期:2018-04-22
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All-optical active THz metasurfaces for ultrafast polarization switching and dynamic beam splitting[J]. LSA, 2018,7(4):228-236.
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).
All-optical active THz metasurfaces for ultrafast polarization switching and dynamic beam splitting[J]. LSA, 2018,7(4):228-236. DOI: 10.1038/s41377-018-0024-y.
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.
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.
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