Localized Nanoresonator Mode in Plasmonic Microcavities

A. Casalis de Pury, X. Zheng, O. S. Ojambati, A. Trifonov, C. Grosse, M-E. Kleemann, V. Babenko, D. Purdie, T. Taniguchi, K. Watanabe, A. Lombardo, G. A. E. Vandenbosch, S. Hofmann, and J. J. Baumberg

Phys. Rev. Lett. 124, 093901 – Published 6 March 2020

Abstract

Submicron-thick hexagonal boron nitride crystals embedded in noble metals form planar Fabry-Perot half-microcavities. Depositing Au nanoparticles on top of these microcavities forms previously unidentified angle- and polarization-sensitive nanoresonator modes that are tightly laterally confined by the nanoparticle. Comparing dark-field scattering with reflection spectroscopies shows plasmonic and Fabry-Perot-like enhancements magnify subtle interference contributions, which lead to unexpected redshifts in the dark-field spectra, explained by the presence of these new modes.

Received 3 May 2019
Revised 29 January 2020
Accepted 30 January 2020

DOI:https://doi.org/10.1103/PhysRevLett.124.093901

Physics Subject Headings (PhySH)

Brewster's angle Mie scattering Nanoantennas Nanophotonics Optical microcavities Photonic crystals Plasmonics Polarization of light

Condensed Matter, Materials & Applied PhysicsAtomic, Molecular & Optical

Authors & Affiliations

A. Casalis de Pury^1,2, X. Zheng³, O. S. Ojambati¹, A. Trifonov⁴, C. Grosse¹, M-E. Kleemann¹, V. Babenko ², D. Purdie², T. Taniguchi⁵, K. Watanabe⁵, A. Lombardo², G. A. E. Vandenbosch³, S. Hofmann ², and J. J. Baumberg ^1,*

¹Nanophotonics Centre, Cavendish Laboratory, University of Cambridge, JJ Thompson Avenue, Cambridge CB3 0HE, United Kingdom
²Cambridge Graphene Centre and Department of Engineering, University of Cambridge, 9 JJ Thompson Avenue, Cambridge CB3 0FA, United Kingdom
³ESAT-TELEMIC, KU Leuven, B-300 Leuven, Belgium
⁴Spin Optics Lab, Saint Petersburg State University, Saint Petersburg 198504, Russia
⁵National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-44, Japan