Investigation of Lattice Plasmon Modes in 2D Arrays of Au Nanoantennas

Crystals

Joseph Marae Djouda¹  Gaëtan Lévêque²  Pierre-Michel Adam³  Thomas Maurer³  Roberto Caputo⁴  Cesare Paolo Umeton⁴  Antonio Ferraro⁴  Giuseppe Emanuele Lio⁴ 

[1] ERMESS, EPF Engineering School, 55 Avenue du Président Wilson, 94230 Cachan, France;Institute of Electronics, Microelectronics and Nanotechnology, Cité Scientifique, Avenue Henri Poincaré, CS 60069, CEDEX, 59652 Villeneuve d’Ascq, France;Laboratory Light, Nanomaterials and Nanotechnologies—L2n, University of Technology of Troyes and CNRS ERL 7004, 12 rue Marie Curie, CS 42060, CEDEX, 10004 Troyes, France;Physics Department, University of Calabria, I-87036 Rende, Italy;

关键词: plasmonic;    nanoantenna;    nanotechnology;    metasurface;   

DOI  :  10.3390/cryst12030336

来源: DOAJ

【 摘 要 】

The coupling of gold nanoantennas (AuNAs) in the arrangement of monomers in bidimensional gratings is investigated both experimentally and numerically. The influence of edge diffraction, corresponding to the grazing propagation of specific diffracted orders, and the dependence of grating parameters on lattice plasmon modes are studied. It is shown that the grating pitch influences the spectral position of the Rayleigh wavelength related to the grazing diffraction in air and/or in glass. In order to investigate the effect of diffraction and its interplay with the Rayleigh wavelength, extinction measurements with different incidence angles are carried out. For incidence angles above $\theta ={20}^{\circ }$, along with the excitation of quadrupolar and vertical modes, very narrow dips or sharp excitations are observed in the spectra. These ones strongly depend on the respective spectral position of Rayleigh anomaly and specific dipolar mode, on the propagation direction of the grazing diffraction, and on the considered plasmon mode. These features are explained in the light of numerical calculations obtained with Green’s tensor method. All the above different characteristics and couplings are of great practical interest, especially for a possible implementation in biosensor devices and for other technological applications spanning from precision medicine and life science to telecommunications and energy systems.

【 授权许可】

Unknown