Broadband non-polarizing terahertz beam splitters with variable split ratio
Seeking effective terahertz functional devices has always aroused extensive attention. Of particular interest is the terahertz beam splitter. Here, we have proposed, designed, manufactured, and tested a broadband non-polarizing terahertz beam splitter with a variable split ratio based on an all-diel...
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Veröffentlicht in: | Applied physics letters 2017-08, Vol.111 (7) |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | Seeking effective terahertz functional devices has always aroused extensive attention. Of
particular interest is the terahertz beam splitter. Here, we have proposed, designed,
manufactured, and tested a broadband non-polarizing terahertz beam splitter with a
variable split ratio based on an all-dielectric metasurface. The metasurface was created
by patterning a dielectric surface of the N-step phase
gradient and etching to a few hundred micrometers. The conversion efficiency as high as
81% under the normal incidence at 0.7 THz was achieved. Meanwhile, such a splitter works
well over a broad frequency range. The split ratio of the proposed design can be
continuously tuned by simply shifting the metasurface, and the angle of emergences can
also be easily adjusted by choosing the step of phase gradients. The proposed design is
non-polarizing, and its performance is kept under different polarizations. |
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ISSN: | 0003-6951 1077-3118 |
DOI: | 10.1063/1.4986538 |