2019
DOI: 10.1038/s41598-019-38820-3
|View full text |Cite
|
Sign up to set email alerts
|

Improvement of Terahertz Photoconductive Antenna using Optical Antenna Array of ZnO Nanorods

Abstract: An efficient terahertz (THz) photoconductive antenna (PCA), as a major constituent for the generation or detection of THz waves, plays an essential role in bridging microwave-to-photonic gaps. Here, we propose an impressive approach comprising the use of arrayed zinc oxide nanorods (ZnO NRs) as an optical nanoantenna over an anti-reflective layer (silicon nitride) in the antenna gap to boost the photocurrent and consequently the THz signal. The numerical approach applied in investigating the optical behavior o… Show more

Help me understand this report

Search citation statements

Order By: Relevance

Paper Sections

Select...
3
1
1

Citation Types

0
21
0

Year Published

2019
2019
2024
2024

Publication Types

Select...
7
1

Relationship

0
8

Authors

Journals

citations
Cited by 49 publications
(21 citation statements)
references
References 34 publications
(31 reference statements)
0
21
0
Order By: Relevance
“…It can be clearly seen that although different PCAs do have amplitude fluctuation, the range of the error is not sufficient to affect the conclusion: the band‐stop and band‐pass resonances at 0.34 and 0.54 THz are definitely present. Comparing with previous nanostructure‐assisted PCA which focuses on enhancing the overall THz power, [ 11–21 ] the proposed micron‐scale SRRs here achieve the manipulation of the spectral characteristics of PCA which is rarely been realized and discussed.…”
Section: Resultsmentioning
confidence: 99%
See 1 more Smart Citation
“…It can be clearly seen that although different PCAs do have amplitude fluctuation, the range of the error is not sufficient to affect the conclusion: the band‐stop and band‐pass resonances at 0.34 and 0.54 THz are definitely present. Comparing with previous nanostructure‐assisted PCA which focuses on enhancing the overall THz power, [ 11–21 ] the proposed micron‐scale SRRs here achieve the manipulation of the spectral characteristics of PCA which is rarely been realized and discussed.…”
Section: Resultsmentioning
confidence: 99%
“…To enhance the performance of PCAs, researchers set their sights on the booming field of metamaterials which have the high design degree of freedom level and flexible manipulation capability. [ 7–9 ] A variety of metallic/dielectric nanostructures, such as gratings, [ 10–12 ] nanoislands, [ 13 ] hole arrays, [ 14 ] pillar arrays, [ 15–18 ] optical nanoantennas, [ 19 ] and interdigitated fingers, [ 20 ] have been integrated to PCAs to achieve outstanding characteristics. These nanostructures play positive roles primarily by altering the interaction of the femtosecond laser pulse and the substrate, thereby controlling the density and dynamics of the photogenerated carriers.…”
Section: Introductionmentioning
confidence: 99%
“…Further improvement of the PCA performance was proposed by Bashirpour et al, 106 where they implemented an optical nanoantenna comprised of an array of dielectric ZnO nanorods to boost the local field and the optical absorption. This resulted in a twofold increase in the THz photocurrent and a fourfold enhancement in the emitted THz power compared with the conventional PCA without nanoantenna.…”
Section: Dielectric Metasurfacesmentioning
confidence: 99%
“…It has been demonstrated earlier that an enhancement factor of 4 in the optical to THz conversion efficiency can be achieved by using plasmonic material as interdigital electrodes [ 22 ]. Additionally, more than 4 times of THz power has been achieved by using optical antenna array of ZnO nanorods [ 23 ]. Further, an enhancement factor of 25 in terahertz radiation has been demonstrated by utilizing transparent-conducting oxcides nanocylinders between photomixer electrodes [ 24 ].…”
Section: Introductionmentioning
confidence: 99%