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Manipulating light scattering and optical confinement in vertically stacked Mie resonators.

Felix Vennberg1, Ajith Padyana Ravishankar1, Srinivasan Anand1

  • 1Applied Physics, KTH Royal Institute of Technology School of Engineering Sciences, Hannes Alféns väg 12, 114 19, Stockholm, Sweden.

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Summary

High index dielectric nanoresonators, specifically vertically stacked AlGaAs nanodisks, enable strong light confinement for optical applications. This study demonstrates their ability to support an anapole state with enhanced field confinement in visible wavelengths.

Keywords:
III–V nanodisksMie resonancesanapolecolloidal lithographyoptical confinementvertical stack

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Area of Science:

  • Nanophotonics
  • Dielectric nanostructures
  • Metamaterials

Background:

  • High index dielectric nanoresonators offer low loss and tunable resonances, enabling novel optical states like bound-states in the continuum (BIC) and anapoles.
  • Plasmonic systems suffer from higher losses compared to dielectric counterparts.
  • AlGaAs/GaAs multilayer systems are suitable for fabricating high-performance nanophotonic devices.

Purpose of the Study:

  • To investigate the optical properties of vertically stacked AlGaAs nanodisk Mie resonators.
  • To engineer an anapole state in the visible wavelength region (400-700 nm).
  • To explore the potential of these structures for enhanced light-matter interactions.

Main Methods:

  • Fabrication of vertically stacked AlGaAs nanodisk resonators using charged sphere colloidal lithography.
  • Optical characterization through reflectance spectra measurements.
  • Numerical simulations using the finite difference time domain (FDTD) method.

Main Results:

  • Vertically stacked AlGaAs nanodisks exhibit a sharp reflectance dip at the anapole wavelength.
  • The reflectance dip contrast is enhanced in specular reflectance for 2 and 3 disk stacks due to an antenna effect.
  • FDTD simulations reveal significantly enhanced field confinement (2-5 times greater than single disks) within the stacked nanodisks, increasing with stack height.

Conclusions:

  • Vertically stacked AlGaAs nanodisk resonators are a promising platform for creating anapole states with enhanced light confinement.
  • The demonstrated fabrication method is scalable and adaptable to various materials and wavelength ranges.
  • These structures offer exciting opportunities for advanced linear and non-linear optical applications.