Nonlocal response in plasmonic waveguiding with extreme light confinement

Nanophotonics

article

Giuseppe Toscano¹  Søren Raza¹  Wei Yan¹  Claus Jeppesen¹  Sanshui Xiao¹  Martijn Wubs¹  Antti-Pekka Jauho³  Sergey I. Bozhevolnyi⁵  N. Asger Mortensen¹ 

[1] Department of Photonics Engineering, Technical University of Denmark;Center for Electron Nanoscopy, Technical University of Denmark;Center for Nanostructured Graphene (CNG), Technical University of Denmark;Department of Micro and Nanotechnology, Technical University of Denmark;Institute of Technology and Innovation, University of Southern Denmark

关键词: Nanoplasmonics;    nonlocal response;    light confinement;    waveguides;    light-matter interactions;    PACS numbers 78.67.Uh;    78.67.Lt;    71.45.Lr;    73.20.Mf;    41.20.Jb;   

DOI  :  10.1515/nanoph-2013-0014

学科分类：社会科学、人文和艺术（综合）

来源: De Gruyter

【 摘 要 】

We present a novel wave equation for linearized plasmonic response, obtained by combining the coupled real-space differential equations for the electric field and current density. Nonlocal dynamics are fully accounted for, and the formulation is very well suited for numerical implementation, allowing us to study waveguides with subnanometer cross-sections exhibiting extreme light confinement. We show that groove and wedge waveguides have a fundamental lower limit in their mode confinement, only captured by the nonlocal theory. The limitation translates into an upper limit for the corresponding Purcell factors, and thus has important implications for quantum plasmonics.

【 授权许可】

CC BY