Open AccessResonant tunneling diode integrated with metalens for high-directivity terahertz waves
Author(s) -
Kota Endo,
Mitsuaki Sekiya,
JaeYoung Kim,
Kento Sato,
Takao Suzuki
Publication year - 2021
Publication title -
applied physics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.911
H-Index - 94
eISSN - 1882-0786
pISSN - 1882-0778
DOI - 10.35848/1882-0786/ac0678
Subject(s) - terahertz radiation , directivity , optics , collimated light , optoelectronics , resonant tunneling diode , reflection (computer programming) , planar , diode , refractive index , quantum tunnelling , physics , materials science , telecommunications , laser , computer science , quantum well , computer graphics (images) , antenna (radio) , programming language
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.