Journal
APPLIED PHYSICS EXPRESS
Volume 14, Issue 8, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.35848/1882-0786/ac0678
Keywords
metasurface; metamaterial; antenna; resonant tunneling diode; terahertz wave
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Funding
- Japan Society for the Promotion of Science (JSPS) [18K04970]
- PRESTO from the Japan Science and Technology Agency (JST) [JPMJPR18I5]
- Inamori Foundation
- Kato Foundation for Promotion of Science
- Iketani Science and Technology Foundation
- TEPCO Memorial Foundation
- GMO Internet Foundation
- Noguchi Institute
- Grants-in-Aid for Scientific Research [18K04970] Funding Source: KAKEN
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The study demonstrates that a collimating metalens made with our original metasurface can significantly enhance the directivity of terahertz waves when mounted on a resonant tunneling diode, making it suitable for emerging industries such as 6G communications.
Terahertz flat optics based on our originally developed low-reflection metasurface with a high refractive index can offer attractive two-dimensional optical components for the manipulation of terahertz waves. However, it remains to be shown whether a planar collimating metalens made with our original metasurface could be mounted on a resonant tunneling diode with a short distance. Here, we demonstrate that a collimating metalens with a distance of 1.0 mm from the RTD enhances the directivity to 3.0 times at 0.312 THz. The proposed metalens would be integrated with various terahertz continuous-wave sources for emerging industry such as 6 G (beyond 5 G) communications.
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