Interaction among plasmonic resonances in a gold film embedding a two-dimensional array of polymeric nanopillars

Abstract

Nanostructured surfaces have proven to be effective in controlling the electric field distribution and triggering a series of interesting physical effects. In particular, ordered metallic lattices with a typical size of the same order of magnitude of the wavelength of the incident radiation exhibit extraordinary transmission and reflection properties and represent a sensitive tool to exploit surface plasmon resonance for sensing applications. We investigated, either by experimental structural and optical measurements or by modeling and calculations, samples consisting of a two-dimensional array of polymeric pillars embedded in a gold film. In particular, we analyzed the dependence of the plasmonic resonance on the pillar size. We showed that a peculiar interplay among localized modes and propagating surface plasmon polaritons exists for some selected conditions and affects the spectral distribution, lifetime, and field configuration of the plasmonic excitations.

Large‐Area Fabrication of Highly Tunable Hybrid Plasmonic–Photonic Structures Based on Colloidal Lithography and a Photoreconfigurable Polymer

“…Meanwhile, the self‐assembled spheres (or after a particular modification) can also be used as templates to produce various nanostructures in conjugation with different etching or deposition steps. This method, known as CL, has been well established in recent years, and is now recognized as a low‐cost, high‐throughput, scalable, and repeatable nanofabrication technique. In this work, a strategy based on CL has been developed to produce periodic nanohole arrays of a photoreconfigurable polymer deposited on a gold surface.…”

Ultrasmooth metallic films with buried nanostructures for backside reflection‐mode plasmonic biosensing

“…The last resonance at 877 nm, on the other hand, shows a strong field extending from the buried grating on the substrate side ("substrate-side" grating resonance). The middle resonance ("coupled mode") at 752 nm shows a combination of propagating and localized modes, with field penetration into the water side and field localization on the substrate side [50,53]. However, it also shows the shortest field penetration (80 nm) into the sensing (water) side of the Au film.…”

A multiplexed label free plasmonic nano-device for near infrared applications

“…1) consist of a hexagonal lattice of polymeric pillars embedded in a gold matrix lying on a glass substrate. The fabrication process, based on colloidal lithography and plasma enhanced chemical vapor deposition (PE-CVD), is described in detail elsewhere [29][30][31] and can be outlined into five steps. A plasma polymerized poly-acrylic acid (ppAA) film is grown on a glass substrate by PE-CVD.…”

“…As previously reported [29][30][31], our sensing surfaces consist of a 2D hexagonal lattice of plasma polymerized poly-acrylic acid (ppAA) nano-pillars embedded in an optically thick gold matrix on a glass substrate.…”