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Hierarchical nanoparticle bragg mirrors: tandem and gradient architectures.

Engelbert Redel¹, Chen Huai, Michael Renner

¹Materials Chemistry and Nanochemistry Research Group, Center for Inorganic and Polymeric Nanomaterials, Chemistry Department, University of Toronto, 80 St. George Street, Toronto, M5S 3H6, Ontario, Canada.

Small (Weinheim an Der Bergstrasse, Germany)

|October 20, 2011

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Researchers developed new porous nanoparticle Bragg mirrors with aperiodic layers. These engineered photonic crystals offer enhanced functionality for applications in chemical sensing and controlled release.

Area of Science:

Materials Science
Nanotechnology
Photonics

Background:

Semiconductor devices commonly use material composition and bandgaps to control electrons.
Photonic crystals, analogous to semiconductors, use photonic bandgaps to manage photons.
Bragg mirrors, simple photonic crystals, traditionally use nonporous dielectric layers.

Purpose of the Study:

To enhance the functionality of nanoparticle Bragg mirrors.
To explore aperiodic porous dielectric layers for improved photonic crystal applications.
To demonstrate novel tandem and gradient structures for advanced functionalities.

Main Methods:

Fabrication of aperiodic porous dielectric layers using nanoparticles.
Engineering of Bragg mirror structures with controlled porosity and layer arrangements.

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Characterization of structural, porosity, optical, and photonic properties of the developed structures.

Main Results:

Successful creation of aperiodic nanoparticle Bragg mirrors.
Demonstration of enhanced functionality through tailored porosity and aperiodic designs.
Prototypical tandem and gradient structures were fully characterized.

Conclusions:

Aperiodic porous nanoparticle Bragg mirrors represent an advancement in photonic crystal technology.
These engineered structures show significant potential for applications in chemical sensing and controlled release.
The developed strategy offers a pathway for novel photonic device functionalities.