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Related Experiment Video

Updated: Jun 15, 2026

Fabrication of Silica Ultra High Quality Factor Microresonators

Fabrication of Silica Ultra High Quality Factor Microresonators

Published on: July 2, 2012

Self-Assembled Silicon@Silica Metasurfaces with High-Quality Resonances in the Infrared.

Megan A Parker¹, Raul Barbosa², Cynthia Cibaka-Ndaya¹

¹University of Bordeaux, CNRS, Bordeaux-INP, ICMCB, UMR 5026 33600 Pessac France.

|July 16, 2025

Summary

Researchers developed a new method for creating silicon@silica particle assemblies for photonic devices. These assemblies exhibit optical magnetism, paving the way for high-performance metasurfaces.

Keywords:

2D particle assembly Mie resonance core‐shell particles metasurface silicon supercritical synthesis

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Last Updated: Jun 15, 2026

Fabrication of Silica Ultra High Quality Factor Microresonators

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Published on: July 2, 2012

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators

Fabrication and Characterization of High-Q Silicon Nitride Membrane Resonators

Published on: August 8, 2025

Area of Science:

Materials Science
Nanotechnology
Optics

Background:

Two-dimensional (2D) assemblies of resonant dielectric particles offer low optical losses and strong electromagnetic responses for advanced photonic devices.
Bottom-up synthesis methods for metasurfaces face challenges with positional disorder and particle size variation.

Purpose of the Study:

To fabricate core-shell silicon@silica particles with tunable multipolar resonances.
To assemble these particles into 2D arrays for optical characterization.
To investigate the generation of optical magnetism in these bottom-up assembled structures.

Main Methods:

Fabrication of core-shell silicon@silica nanoparticles.
Assembly of nanoparticles at an air-water interface to form 2D arrays.
Optical characterization using ellipsometry and optical microscopy.

Main Results:

Demonstrated multipolar resonances in the visible and near-infrared spectrum.
Achieved semi-ordered 2D arrays with crystalline islands.
Observed a high-quality factor magnetic resonance at approximately 945 nm, indicated by a Lorentzian resonance in permeability.

Conclusions:

This work presents the first bottom-up synthesis of silicon particle assemblies exhibiting optical magnetism.
The findings suggest potential for scalable production of high-performance metasurfaces despite inherent imperfections in bottom-up fabrication.