Tamm plasmon-polaritons structures with Bi-substituted garnet layers

Tatyana Mikhailova,Andrey Karavainikov,Alexander Shaposhnikov,Sergey Lyashko,Sergey Tomilin,Anatoly Prokopov,Vladimir Berzhansky,N Perov,A Semisalova

doi:10.1051/epjconf/201818502016

Abstract

New original Tamm plasmon-polaritons (TPP) structures with Bi-substituted iron garnet and Au plasmonic layers were proposed, synthesized and investigated. The structures with single and double garnet layers were modelled to form a TPP mode at the center of photonic band gab. The top Au layer has the gradient thickness varied in the range from 0 to 65.2 nm. It was found the features of TPP resonances as a function of the thickness of metal coating. The resonances on TPP have the maximum optical quality factor and transmission at the vicinity of Au thickness of 30 nm. These configurations are optimum to form the highest intensity of electric field of light wave in the area of the magnetic layers. It was found the spectral blue and red shifts of TPP mode with increasing of Au thickness. The blue and red shifts can be explained respectively by structural and thickness changes of Au coating. The maximum resonant values of Faraday rotation were –2.1° at 664 nm and –12.3° at 645 nm for structures with single and double garnet layers, respectively, and thickness of Au coating of 65.2 nm.

Highlights

The one-dimensional nanostructures of photonic crystals with bismuth-substituted iron garnet (Bi: IG) layers are perspective for magnetooptical (MO) sensors in optoelectronic devices allowed significant rotation of the polarization plane of the transmitted light
One of the first proposed structures in magnetophotonics was the microcavity based on nonmagnetic dielectric Bragg mirrors (BM) and a Bi: IG layer [1,2,3,4,5]
We proposed and investigated the new type of microcavity structure on basis of nonmagnetic dielectric BM and double iron garnet layer with low and high Bi content [15,16,17]

Summary

Introduction

The one-dimensional nanostructures of photonic crystals with bismuth-substituted iron garnet (Bi: IG) layers are perspective for magnetooptical (MO) sensors in optoelectronic devices allowed significant rotation of the polarization plane of the transmitted light. One of the first proposed structures in magnetophotonics was the microcavity based on nonmagnetic dielectric Bragg mirrors (BM) and a Bi: IG layer [1,2,3,4,5]. In such structures, Faraday and Kerr rotation enhancement is achieved most effectively. We proposed and investigated the new type of microcavity structure on basis of nonmagnetic dielectric BM and double iron garnet layer with low and high Bi content [15,16,17]. The buffer layer of silicon oxide was used to reduce the absorption of light at the magnetic layer-metal interface

Experimental technique and modelling

Synthesis

Structure with single Bi

Structure with double Bi

Conclusions