Electromagnetic properties of a monolayer of polarisable particles deposited on graphene

André Souto; Rui M. S. Pereira; Jaime E. Santos; Nuno Peres; Mikhail Vasilevskiy

doi:10.1117/12.2271960

22 August 2017 Electromagnetic properties of a monolayer of polarisable particles deposited on graphene

André Souto, Rui M. S. Pereira, Jaime E. Santos, Nuno Peres, Mikhail Vasilevskiy

Proceedings Volume 10453, Third International Conference on Applications of Optics and Photonics; 104530V (2017) https://doi.org/10.1117/12.2271960
Event: Third International Conference on Applications of Optics and Photonics, 2017, Faro, Portugal

Abstract

Interesting plasmonic effects can arise from the combination of small polarisable particles with graphene, related to surface plasmon-polaritons (SPPs) supported by the latter in the terahertz (THz) spectral range. The electromagnetic coupling between graphene SPPs and dipole moments of nanoparticles (NPs) deposited on top of it gives rise to optical properties that aren’t present in the individual components of this system. The NPs’ polarisability is renormalized due to the electromagnetic back action of the SPPs which are excited in graphene when an external propagating electromagnetic wave impinges on the particle. Moreover, beyond the usual dipole-dipole interaction, an indirect particle-particle coupling arises via polarisation charges induced on the graphene-covered interface by each particle – this indirect coupling oscillates with the interparticle distance. We derived coupled-dipole equations taking into account all these effects, allowing us to calculate an effective optical conductivity of the particles’ monolayer. One of the G+NPs system’s unique properties is a collective polariton mode, causing a considerable enhancement of the THz radiation absorption in graphene, while the reflection drops to nearly zero for a broad range of angles of incidence. The frequency of this resonant mode can be adjusted by changing the Fermi energy in graphene via electrostatic gating and therefore it can be used for electrically controlled reflection and transmission of THz radiation

Citation Download Citation

André Souto, Rui M. S. Pereira, Jaime E. Santos, Nuno Peres, and Mikhail Vasilevskiy "Electromagnetic properties of a monolayer of polarisable particles deposited on graphene", Proc. SPIE 10453, Third International Conference on Applications of Optics and Photonics, 104530V (22 August 2017); https://doi.org/10.1117/12.2271960

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available