Multilevel Spherical Photonic Crystals with Controllable Structures and Structure-Enhanced Functionalities

Juan Wang, Hai Le The, Lingling Shui*, Johan G. Bomer, Mingliang Jin, Guofu Zhou, Paul Mulvaney, Pepijn W.H. Pinkse, Albert van den Berg, Loes Segerink, Jan C.T. Eijkel

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)

Abstract

Spherical photonic crystals (SPCs) with tailorable multiscale structure, versatile surface morphology, and controllable optical properties of both photonic stop band (PSB) and surface plasmon resonance (SPR), have been fabricated using a robust and facile method. The fabricated SPCs consist of well-spaced gold nanocrystals (AuNCs) (3rd-tier) anchored on silica nanopatterns (2nd-tier) confined in microspherical templates (1st-tier). Droplet microfluidics is used to produce microdroplets containing silica nanoparticles (SiO2NPs) which assemble to form two-tier SPCs. Subsequently, three-tier SPCs are obtained by thermal dewetting and evaporation of metal films deposited on the two-tier SPCs, with the 3rd-tier morphology being controlled by the deposited film morphology and programmed thermal annealing. Optical PSB and SPR properties of the prepared SPCs can be on-demand tailored by the 2nd and 3rd-tier morphology and their corresponding constituent materials. It is found that the scattering from AuNC arrays on the SPCs can be amplified by tailoring the PSB properties. The hierarchical SPCs manufactured by this method take advantages of low-cost, high controllability, and further processability. The manufacturing of flexible film encapsulated well-assembled SPCs as anticounterfeiting stamps, which are easy to be identified using the mobile phone with a flash, is demonstrated.
Original languageEnglish
Article number1902164
Number of pages11
JournalAdvanced Optical Materials
Volume8
Issue number10
Early online date17 Mar 2020
DOIs
Publication statusPublished - 18 May 2020

Keywords

  • UT-Hybrid-D
  • droplet microfluidics
  • photonic stop band
  • surface plasmon resonance
  • dewetting
  • periodic lattice
  • spherical photonic crystal

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