Abstract
The work considers the effect of extraordinary optical transmission (EOT) in polycrystalline arrays of nanopores fabricated via nanosphere photolithography (NPL). The use of samples with different qualities of polycrystalline structure allows us to reveal the role of disorder for EOT. We propose a phenomenological model which takes the disorder into account in numerical simulations and validate it using experimental data. Due to the NPL flexibility for the structure geometry control, we demonstrate the possiblity to partially compensate the disorder influence on EOT by the nanopore depth adjustments. The proposed experimental and theoretical results are promising to reveal the NPL limits for EOT-based devices and stimulate systematic studies of disorder compensation designs.
Highlights
The effect of extraordinary optical transmission (EOT) has been intensively studied for two past decades since the pioneering work of Ebbesen in 1998 [1]
A number of works consider EOT-supporting plasmonic structures prepared via metal deposition into the interstices between colloidal particles [22,23] or by covering of a nanosphere mask with a thin metal film [24] with possible subsequent removal of particles [25,26]
In this work we focused on the possible nanosphere photolithography (NPL) applications for EOT devices, and considered the effect in the visible and near-IR range
Summary
The effect of extraordinary optical transmission (EOT) has been intensively studied for two past decades since the pioneering work of Ebbesen in 1998 [1]. A number of works consider EOT-supporting plasmonic structures prepared via metal deposition into the interstices between colloidal particles [22,23] or by covering of a nanosphere mask with a thin metal film [24] with possible subsequent removal of particles [25,26]. The other hand, the presence of disorder imposed by polycrystallinity affects the resonant optical behavior It was numerically shown in [31] that randomly positioned perforations in a dielectric thin film possess a smooth broadband absorption, while amorphous pattern excites multiple resonant modes not observed in spectra of periodically arranged nanopores. Polycrystalline structures in [32] were used as advanced light absorbers Both numerical simulations in [33] and experimental measurements in [25] showcase a lowering and flattening of transmission through thin gold films when the disorder increases. Obtained results are promising to reveal the NPL limits for EOT-based devices and pave the way toward plasmonic sample designs with disorder compensation
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