Hyperbolic metamaterials (HMMs) offer unconventional properties in the field of optics, enabling opportunities for confinement and propagation of light at the nanoscale. In‐plane orientation of the optical axis, in the direction coinciding with the anisotropy of the HMMs, is desirable for a variety of novel applications in nanophotonics and imaging. Here, a method for creating localized HMMs with in‐plane optical axis, based on block copolymer (BCP) blend instability, is introduced. The dewetting of BCP thin film over topographically defined substrates generates droplets composed of highly ordered lamellar nanostructures in hierarchical configuration. The hierarchical nanostructures represent a valuable platform for the subsequent pattern transfer into a Au/air HMM, exhibiting hyperbolic behavior in a broad wavelength range in the visible spectrum. A computed Purcell factor as high as 32 at 580 nm supports the strong reduction in the fluorescence lifetime of defects in nanodiamonds placed on top of the HMM.

Hyperbolic Metamaterials via Hierarchical Block Copolymer Nanostructures / Murataj, Irdi; Channab, Marwan; Cara, Eleonora; Pirri, Candido F.; Boarino, Luca; Angelini, Angelo; FERRARESE LUPI, Federico. - In: ADVANCED OPTICAL MATERIALS. - ISSN 2195-1071. - (2021). [10.1002/adom.202001933]

Hyperbolic Metamaterials via Hierarchical Block Copolymer Nanostructures

Irdi Murataj
Writing – Original Draft Preparation
;
Eleonora Cara
Investigation
;
Luca Boarino
Funding Acquisition
;
Angelo Angelini
Investigation
;
Federico Ferrarese Lupi
Investigation
2021

Abstract

Hyperbolic metamaterials (HMMs) offer unconventional properties in the field of optics, enabling opportunities for confinement and propagation of light at the nanoscale. In‐plane orientation of the optical axis, in the direction coinciding with the anisotropy of the HMMs, is desirable for a variety of novel applications in nanophotonics and imaging. Here, a method for creating localized HMMs with in‐plane optical axis, based on block copolymer (BCP) blend instability, is introduced. The dewetting of BCP thin film over topographically defined substrates generates droplets composed of highly ordered lamellar nanostructures in hierarchical configuration. The hierarchical nanostructures represent a valuable platform for the subsequent pattern transfer into a Au/air HMM, exhibiting hyperbolic behavior in a broad wavelength range in the visible spectrum. A computed Purcell factor as high as 32 at 580 nm supports the strong reduction in the fluorescence lifetime of defects in nanodiamonds placed on top of the HMM.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11696/68286
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