Issue 37, 2018

Surface plasmon modes of nanomesh-on-mirror nanocavities prepared by nanosphere lithography

Abstract

Metal–insulator–metal (MIM) structures show great potential for numerous photonic applications due to their ability to confine light energy to volumes with deeply sub-wavelength dimensions. Here, MIM structures comprising hexagonal gold nanohole arrays were prepared by nanosphere lithography. Angle-resolved UV-vis-NIR spectroscopy revealed a series of narrow, dispersive and non-dispersive modes, which were attributed to the excitation of surface plasmon polariton (SPP) modes. Applying finite-difference time-domain (FDTD) simulations and analytical diffraction phase-matching theory all resonances can be ascribed to only two SPP modes traveling at the outer gold surface and in the gap layer sandwiched between two metal films. Metamaterial resonances, as reported in the literature for similar structures, are not needed to fully explain the reflectance spectra. Bragg scattering of the symmetric gap SPP mode results in a gap resonance, which is insensitive to the angle of incidence over a broad angular range. The spectral position of this flat band can be controlled by tuning the grating period of the nanohole array as well as the thickness and the refractive index of the dielectric gap.

Graphical abstract: Surface plasmon modes of nanomesh-on-mirror nanocavities prepared by nanosphere lithography

Supplementary files

Article information

Article type
Paper
Submitted
08 Jul 2018
Accepted
11 Sep 2018
First published
12 Sep 2018

Nanoscale, 2018,10, 17983-17989

Surface plasmon modes of nanomesh-on-mirror nanocavities prepared by nanosphere lithography

C. Stelling, S. Fossati, J. Dostalek and M. Retsch, Nanoscale, 2018, 10, 17983 DOI: 10.1039/C8NR05499A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements