TY - JOUR
T1 - Ensembles of photonic beads
T2 - optical properties and enhanced light—matter interactions
AU - Aravindakshan, Nikhil
AU - Eftekhari, Ehsan
AU - Tan, Say Hwa
AU - Li, Xiaomin
AU - St John, James
AU - Nguyen, Nam Trung
AU - Zhao, Huijun
AU - Zhao, Dongyuan
AU - Li, Qin
N1 - Funding Information:
The authors acknowledge the support provided by the Australian Research Council (ARC DP160104089). N.A. wishes to thank the Griffith University International Postgraduate Scholarship. The authors acknowledge the support from the Queensland node of the Australian National Fabrication Facility (ANFF), a company established under the National Collaborative Research Infrastructure Strategy to provide nano‐ and microfabrication facilities for Australia's researchers. The authors also acknowledge the technical support from the Queensland Micro‐ and Nanotechnology Centre at Griffith University, and the Centre for Microscopy and Microanalysis at the University of Queensland.
Funding Information:
The authors acknowledge the support provided by the Australian Research Council (ARC DP160104089). N.A. wishes to thank the Griffith University International Postgraduate Scholarship. The authors acknowledge the support from the Queensland node of the Australian National Fabrication Facility (ANFF), a company established under the National Collaborative Research Infrastructure Strategy to provide nano- and microfabrication facilities for Australia's researchers. The authors also acknowledge the technical support from the Queensland Micro- and Nanotechnology Centre at Griffith University, and the Centre for Microscopy and Microanalysis at the University of Queensland.
Publisher Copyright:
© 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
PY - 2020/4/1
Y1 - 2020/4/1
N2 - Light management is of paramount importance to improve the performance of optoelectronic devices including photodetectors, optical sensors, solar cells, and light-emitting diodes. Photonic crystals are shown as an effective metamaterial for trapping light among their various photon management functions. Herewith, it is demonstrated that spherical photonic crystals, or in other words, photonic beads, possess a stronger light-trapping effect compared to the planar counterpart. The photonic beads are fabricated by colloidal self-assembly under microdroplet confinement employing microfluidic devices. The light–matter interactions are illustrated by the emission intensity and lifetime of the embedded emitters, namely carbon dots and upconversion nanoparticles (UCNPs). The bandgaps of the photonic beads are selected according to the emission and excitation peaks of the light emitters, whereby the emission or excitation peak overlaps the blue edge or red edge of the photonic bands, respectively. Significantly stronger emission and extended luminescence lifetime are observed in photonic beads ensemble in comparison to the planar photonic crystals, demonstrating enhanced light trapping owing to the spherical geometry, which introduces additional microcavity effect. Photonic beads represent a perfect hierarchical light manipulation system. Combining both photonic and microcavity resonator effects, photonic beads potentially find applications in light harvesting, sensing, lighting devices, and light-triggered manipulations.
AB - Light management is of paramount importance to improve the performance of optoelectronic devices including photodetectors, optical sensors, solar cells, and light-emitting diodes. Photonic crystals are shown as an effective metamaterial for trapping light among their various photon management functions. Herewith, it is demonstrated that spherical photonic crystals, or in other words, photonic beads, possess a stronger light-trapping effect compared to the planar counterpart. The photonic beads are fabricated by colloidal self-assembly under microdroplet confinement employing microfluidic devices. The light–matter interactions are illustrated by the emission intensity and lifetime of the embedded emitters, namely carbon dots and upconversion nanoparticles (UCNPs). The bandgaps of the photonic beads are selected according to the emission and excitation peaks of the light emitters, whereby the emission or excitation peak overlaps the blue edge or red edge of the photonic bands, respectively. Significantly stronger emission and extended luminescence lifetime are observed in photonic beads ensemble in comparison to the planar photonic crystals, demonstrating enhanced light trapping owing to the spherical geometry, which introduces additional microcavity effect. Photonic beads represent a perfect hierarchical light manipulation system. Combining both photonic and microcavity resonator effects, photonic beads potentially find applications in light harvesting, sensing, lighting devices, and light-triggered manipulations.
KW - fluorescence enhancement
KW - photonic beads
KW - photonic crystals
KW - slow photons
UR - https://www.scopus.com/pages/publications/85078674404
U2 - 10.1002/adom.201901537
DO - 10.1002/adom.201901537
M3 - Article
AN - SCOPUS:85078674404
SN - 2195-1071
VL - 8
JO - Advanced Optical Materials
JF - Advanced Optical Materials
IS - 7
M1 - 1901537
ER -