Document Detail


Self-Assembled Hierarchical Nanostructures for High Efficiency Porous Photonics Crystals.
MedLine Citation:
PMID:  25415598     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
The nanoscale modulation of material properties such as porosity and morphology, are used in the natural world to mold the flow of light and to obtain structural colors. The ability to mimic these strategies whilst adding technological functionality has the potential to open up a broad array of applications. Porous photonic crystals are one such technological candidate, but have typically underachieved in terms of available materials, structural and optical quality, compatibility with different substrate (e.g. silicon, flexible, organics) and scalability. We report here an alternative fabrication method based on the bottom-up self-assembly of elementary building blocks from the gas-phase into high surface area photonic hierarchical nanostructures at room temperature. Periodic refractive index modulation is achieved by stacking layers with different nano-architectures. High efficiency porous Bragg-reflectors are successfully fabricated with sub-micrometer thick films on glass, silicon and flexible substrates. High diffraction efficiency broad band mirrors (R≈1), opto-fluidic switches and arrays of photonic crystal pixels with size < 10 μm are demonstrated. Possible application in filtering, sensing, electro-optical modulation, solar cells, and photocatalysis are envisioned.
Authors:
Luca Passoni; Luigino Criante; Francesco Fumagalli; Francesco Scotognella; Guglielmo Lanzani; Fabio Di Fonzo
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2014-11-21
Journal Detail:
Title:  ACS nano     Volume:  -     ISSN:  1936-086X     ISO Abbreviation:  ACS Nano     Publication Date:  2014 Nov 
Date Detail:
Created Date:  2014-11-21     Completed Date:  -     Revised Date:  2014-11-21    
Medline Journal Info:
Nlm Unique ID:  101313589     Medline TA:  ACS Nano     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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