Light Absorption Enhancement by Employing A Plasmonic Nanobox Cavity Array

Abstract

This research numerically investigated a plasmonic nanobox cavity array situated on top of a back reflecting film to produce significant light confinement in close proximity to the nanobox configuration. The back reflector-coupled metallic nanostructure platform effectively absorbs incident light sources of a wide range of wavelengths due to local field enhancement from the coupling of the surface plasmon. The electromagnetic field distribution and light absorption spectra of the nanobox cavity platform were analyzed via a finite-difference time-domain method to identify the degree of absorption enhancement of the platform. By adjusting the design parameters of the nanostructure array, the absorption spectra peaks of the nanobox cavity platform can be precisely tuned. The proposed metallic nanostructure-based platform can be employed for various applications to achieve highly enhanced optical performance such as photovoltaics, surface-enhanced Raman scattering, and bio-sensing devices.

Enhanced Photothermal Heating from One‐dimensional Assemblies of Au Nanoparticles Encapsulated by TiO2 Shell

“…[17][18][19][20] In addition, the extinction property of plasmonic nanostructures has been alternatively modified by chemical interface damping method, 21 polarized light, 22 and cavitation. 23 Interestingly, when metal NPs are assembled in the vicinity of each other, the LSPR of individual NPs can be coupled to enhance the strength of the LSPRs than that of isolated NPs. [17][18][19][20][21][22][23][24][25] In this regard, one-dimensional NP and/or NR assemblies can allow directional plasmonic coupling along the alignment axis, which would be useful to control the propagation of incident photons for optoelectric applications.…”

“…23 Interestingly, when metal NPs are assembled in the vicinity of each other, the LSPR of individual NPs can be coupled to enhance the strength of the LSPRs than that of isolated NPs. [17][18][19][20][21][22][23][24][25] In this regard, one-dimensional NP and/or NR assemblies can allow directional plasmonic coupling along the alignment axis, which would be useful to control the propagation of incident photons for optoelectric applications. 1,7 In addition, unlike the non-assembled NPs that have narrow extinction spectrum in the visible region, the extinction of one-dimensional NP assembly can be extended over longer wavelength direction up to near-IR (NIR) region.…”

“…The absorption and scattering constitute the extinction of metal NPs, the relative contribution of which can be engineered by the size and shape of metal NPs 17–20 . In addition, the extinction property of plasmonic nanostructures has been alternatively modified by chemical interface damping method, 21 polarized light, 22 and cavitation 23 . Interestingly, when metal NPs are assembled in the vicinity of each other, the LSPR of individual NPs can be coupled to enhance the strength of the LSPRs than that of isolated NPs 17–25 .…”