Terahertz photoconductive antenna based on antireflection dielectric metasurfaces with embedded plasmonic nanodisks.
Appl Opt
; 60(26): 7921-7928, 2021 Sep 10.
Article
in En
| MEDLINE
| ID: mdl-34613051
ABSTRACT
By taking advantage of dielectric metasurfaces and plasmonic nanostructures, a terahertz photoconductive antenna (THz-PCA) is proposed and investigated in detail. The designed dielectric metasurfaces can reduce the optical reflection down to 1.4% and accelerate the switching process (electric conductive to resistive) that broadens the THz spectrum emitted from THz-PCA. Simultaneously, the embedded plasmonic nanostructures can realize 11.2 times enhancement in local electric field without affecting the switching process and the damage threshold of the THz-PCA. Simulated results indicate that the proposed THz-PCA is 70.56 times stronger in THz radiation power than that of the traditional THz-PCA. The significant enhancement ensures the proposed THz-PCA has great prospects in promoting THz technology based on the THz-PCA.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Appl Opt
Year:
2021
Document type:
Article