| Full text | |
| Author(s): |
Alvarenga, Vinicius T.
;
Bahamon, Dario A.
;
Peres, Nuno M. R.
;
de Matos, Christiano J. S.
Total Authors: 4
|
| Document type: | Journal article |
| Source: | Plasmonics; v. 18, n. 1, p. 11-pg., 2022-12-26. |
| Abstract | |
Graphene plasmons have attracted significant attention due to their tunability, potentially long propagation lengths and ultracompact wavelengths. However, the latter characteristic imposes challenges to light-plasmon coupling in practical applications, generally requiring sophisticated coupling setups, extremely high doping levels and/or graphene nanostructuring close to the resolution limit of current lithography techniques. Here, we propose and theoretically demonstrate a method for alleviating such a technological strain through the use of a practical substrate whose low and negative dielectric function naturally enlarges the graphene polariton wavelength to more manageable levels. We consider silicon carbide (SiC), as it exhibits a dielectric function whose real part is between -1 and 0, while its imaginary part remains lower than 0.05, in the 951 to 970 cm(-1) mid-infrared spectral range. Our calculations show hybridization with the substrate's phonon polariton, resulting in a polariton wavelength that is an order of magnitude longer than obtained with a silicon dioxide substrate, while the propagation length increases by the same amount. (AU) | |
| FAPESP's process: | 18/25339-4 - Integrated photonics devices |
| Grantee: | Newton Cesario Frateschi |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 15/11779-4 - Plasmonic and nonlinear effects in graphene coupled to optical waveguides |
| Grantee: | Christiano José Santiago de Matos |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 18/07276-5 - Mid- and far-infrared plasmonic biosensing with graphene |
| Grantee: | Christiano José Santiago de Matos |
| Support Opportunities: | Regular Research Grants |