Magneto-optical characteristics of Au-Ni metasurface 1. . Gold d - - PowerPoint PPT Presentation

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magneto optical characteristics of au ni metasurface
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Magneto-optical characteristics of Au-Ni metasurface 1. . Gold d - - PowerPoint PPT Presentation

Dec 04, 2023 19 likes •129 views

Magneto-optical characteristics of Au-Ni metasurface 1. . Gold d ring g stru ructure cture One ring structure Double ring structure The design optimization 2. . Hybrid Au-Ni Ni ring ng stru ruct cture re The design

slide-1
SLIDE 1

Magneto-optical characteristics of Au-Ni metasurface

1. . Gold d ring g stru ructure cture

  • One ring structure
  • Double ring structure
  • The design optimization

2. . Hybrid Au-Ni Ni ring ng stru ruct cture re

  • The design optimization
  • Magneto-optical characteristics

Kater eryna yna Domina na

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SLIDE 2

One ring structure

hring=60nm

EM-wave normal incident

D=300nm rin rout vacuum Au

rin=40nm rout=60nm

0,5 0,6 0,7 0,8 0,9 1,0 1,1 1,2 0,0 0,2 0,4 0,6 0,8 1,0

|R|

2&|T| 2

Wavelength, m |T|

2

|R|

2

  • 1. G

Gold ld ring structure ucture

slide-3
SLIDE 3

Double gold ring structure

SiO2 Au 250nm hring=20nm hspacer=50nm D[nm] rin rout

rin=40nm rout=60nm

ɛSiO2 =2.1

slide-4
SLIDE 4

Double gold ring structure

Current density distribution at resonances Symmetrical mode Asymmetrical mode

slide-5
SLIDE 5

5 SiO2 Au 250nm hring=20nm hspacer D=300nm rin rout

rin=40nm rout=60nm

ɛSiO2 =2.1

2 Au rings on Silica substrate (varying spacer height)

slide-6
SLIDE 6

6 SiO2 Au 250nm hring hspacer=50nm D=300nm rin rout

rin=40nm rout=60nm

ɛSiO2 =2.1

2 Au rings on Silica substrate (varying ring height)

slide-7
SLIDE 7

7

rin=60-delta [nm] rout=60+delta [nm]

SiO2 Au 250nm hring=30nm hspacer=50nm D=300nm rin rout

ɛSiO2 =2.1

2 Au rings on Silica substrate (varying delta)

slide-8
SLIDE 8
  • 2. H

Hybri rid Au-Ni Ni ring g structure ucture

SiO2 250nm hring=50nm hspacer=40nm D=300nm rin rout

rin=40nm rout=60nm

ɛSiO2 =2.1

slide-9
SLIDE 9

Ni upper+Au bottom 1 2 λ=0,78µm λ=0,46µm Au upper+Ni bottom λ=0,74µm λ=0,46µm

Current density distribution at resonances

slide-10
SLIDE 10

One Ni ring per period

10

hring=20nm

Ni

SiO2 250nm D[nm] rin rout

rin=40nm rout=60nm

Kerr rotation for 500 nm Ni film

slide-11
SLIDE 11

Ni upper+Au bottom MOKE Faraday effect Optimized design of hybrid Au-Ni structure provides

  • excitation of asymmetrical mode resonance in the optical range
  • btaining Kerr rotation of ring structure with a filling factor ≈7%

comparable to Kerr rotation of bulk Ni

  • changing the direction of polarization rotation without changing the

direction of magnitization

hring=60nm hspacer=40nm rin=40nm rout=60nm D=300nm