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Quantum mechanical analysis of nonlinear optical response of interacting graphene nanoflakes

Deng, H; Manrique, DZ; Chen, X; Panoiu, NC; Ye, F; (2018) Quantum mechanical analysis of nonlinear optical response of interacting graphene nanoflakes. APL Photonics , 3 (1) , Article 016102. 10.1063/1.5009600. Green open access

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Abstract

We propose a distant-neighbor quantum-mechanical (DNQM) approach to study the linear and nonlinear optical properties of graphene nanoflakes (GNFs). In contrast to the widely used tight-binding description of the electronic states that considers only the nearest-neighbor coupling between the atoms, our approach is more accurate and general, as it captures the electron-core interactions between all atoms in the structure. Therefore, as we demonstrate, the DNQM approach enables the investigation of the optical coupling between two closely separated but chemically unbound GNFs. We also find that the optical response of GNFs depends crucially on their shape, size, and symmetry properties. Specifically, increasing the size of nanoflakes is found to shift their accommodated quantum plasmon oscillations to lower frequency. Importantly, we show that by embedding a cavity into GNFs, one can change their symmetry properties, tune their optical properties, or enable otherwise forbidden second-harmonic generation processes.

Type: Article
Title: Quantum mechanical analysis of nonlinear optical response of interacting graphene nanoflakes
Open access status: An open access version is available from UCL Discovery
DOI: 10.1063/1.5009600
Publisher version: https://doi.org/10.1063/1.5009600
Language: English
Additional information: © 2017 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng
URI: https://discovery.ucl.ac.uk/id/eprint/10061312
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