Enhanced optical gradient forces between coupled graphene sheets

Optical gradient forces between monolayer infinite-width graphene sheets as well as single-mode graphene nanoribbon pairs of graphene surface plasmons (GSPs) at mid-infrared frequencies were theoretically investigated. Although owing to the strongly enhanced optical field, the normalized optical for...

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Bibliographic Details
Published in:Scientific reports 2016-06, Vol.6 (1), p.28568-28568, Article 28568
Main Authors: Xu, Xinbiao, Shi, Lei, Liu, Yang, Wang, Zheqi, Zhang, Xinliang
Format: Article
Language:English
Subjects:
639/624/400/1021
639/624/400/1113
Chemical potential
Graphene
Humanities and Social Sciences
Light
multidisciplinary
Propagation
Science
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Summary:Optical gradient forces between monolayer infinite-width graphene sheets as well as single-mode graphene nanoribbon pairs of graphene surface plasmons (GSPs) at mid-infrared frequencies were theoretically investigated. Although owing to the strongly enhanced optical field, the normalized optical force, f n , can reach 50 nN/μm/mW, which is the largest f n as we know, the propagation loss is also large. But we found that by changing the chemical potential of graphene, f n and the optical propagation loss can be balanced. The total optical force acted on the nanoribbon waveguides can thus enhance more than 1 order of magnitude than that in metallic surface plasmons (MSPs) waveguides with the same length and the loss can be lower. Owing to the enhanced optical force and the significant n eff tuning by varying the chemical potential of graphene, we also propose an ultra-compact phase shifter.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep28568