Journal
SCIENTIFIC REPORTS
Volume 9, Issue -, Pages -Publisher
NATURE RESEARCH
DOI: 10.1038/s41598-019-56789-x
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Funding
- National Key Research and Development Program of China [2017YFA0701000]
- National Natural Science Foundation of China [61831012, 61971242, 61671491]
- Natural Science Foundation of Tianjin City [19JCYBJC16600]
- Young Elite Scientists Sponsorship Program by Tianjin [TJSQNTJ-2017-12]
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In this work, an active nonreciprocal THz beam steering has been proposed based on a transversely magnetized metal/InSb metagrating. The nonreciprocal dispersion relation and phase shift characteristics of the metal/InSb waveguide are investigated in details. A metagrating structure with gradient phase shift has been designed based on the metal/InSb waveguide. Under the external magnetic field (EMF), the THz beam can be changed among 0, +1st, and -1st order of the metagrating. Due to the nonreciprocity of the metal/InSb metagrating, the deflection angle can be controlled by changing the positive and negative directions of the EMF, to realize bilateral symmetric scanning from -67.8 degrees to 67.8 degrees with over 70% diffraction efficiency, and this device also exhibits the nonreciprocal one-way transmission as an isolator with the isolation of 13 dB. This low-loss, large deflection degree, nonreciprocal beam scanner has a great potential application in the THz regime.
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