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Edge-oriented and steerable hyperbolic polaritons in anisotropic van der Waals nanocavities.
Dai, Zhigao; Hu, Guangwei; Si, Guangyuan; Ou, Qingdong; Zhang, Qing; Balendhran, Sivacarendran; Rahman, Fahmida; Zhang, Bao Yue; Ou, Jian Zhen; Li, Guogang; Alù, Andrea; Qiu, Cheng-Wei; Bao, Qiaoliang.
Afiliação
  • Dai Z; Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, 388 Lumo Road, 430074, Wuhan, P. R. China.
  • Hu G; Department of Materials Science and Engineering, ARC Centre of Excellence in Future Low-Energy Electronics Technologies (FLEET), Monash University, Wellington Road, Clayton, Victoria, 3800, Australia.
  • Si G; Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore, 117583, Singapore.
  • Ou Q; Photonics Initiative, Advanced Science Research Center, City University of New York, New York, NY, 10031, USA.
  • Zhang Q; College of Information Science and Engineering, Northeastern University, 110004, Shenyang, China.
  • Balendhran S; Department of Materials Science and Engineering, ARC Centre of Excellence in Future Low-Energy Electronics Technologies (FLEET), Monash University, Wellington Road, Clayton, Victoria, 3800, Australia.
  • Rahman F; Department of Electrical and Computer Engineering, National University of Singapore, 4 Engineering Drive 3, Singapore, 117583, Singapore.
  • Zhang BY; School of Physics, The University of Melbourne, Parkville, VIC, 3010, Australia.
  • Ou JZ; School of Engineering, RMIT University, Melbourne, VIC, 3000, Australia.
  • Li G; School of Engineering, RMIT University, Melbourne, VIC, 3000, Australia.
  • Alù A; School of Engineering, RMIT University, Melbourne, VIC, 3000, Australia.
  • Qiu CW; Engineering Research Center of Nano-Geomaterials of Ministry of Education, Faculty of Materials Science and Chemistry, China University of Geosciences, 388 Lumo Road, 430074, Wuhan, P. R. China.
  • Bao Q; Photonics Initiative, Advanced Science Research Center, City University of New York, New York, NY, 10031, USA.
Nat Commun ; 11(1): 6086, 2020 Nov 30.
Article em En | MEDLINE | ID: mdl-33257664
ABSTRACT
Highly confined and low-loss polaritons are known to propagate isotropically over graphene and hexagonal boron nitride in the plane, leaving limited degrees of freedom in manipulating light at the nanoscale. The emerging family of biaxial van der Waals materials, such as α-MoO3 and V2O5, support exotic polariton propagation, as their auxiliary optical axis is in the plane. Here, exploiting this strong in-plane anisotropy, we report edge-tailored hyperbolic polaritons in patterned α-MoO3 nanocavities via real-space nanoimaging. We find that the angle between the edge orientation and the crystallographic direction significantly affects the optical response, and can serve as a key tuning parameter in tailoring the polaritonic patterns. By shaping α-MoO3 nanocavities with different geometries, we observe edge-oriented and steerable hyperbolic polaritons as well as forbidden zones where the polaritons detour. The lifetime and figure of merit of the hyperbolic polaritons can be regulated by the edge aspect ratio of nanocavity.

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Nat Commun Ano de publicação: 2020 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Nat Commun Ano de publicação: 2020 Tipo de documento: Article