Self-assembled pagoda-like nanostructure-induced vertically stacked split-ring resonators for polarization-sensitive dichroic responses

Abstract

Stacked split-ring resonators (SSRR) arrays exhibiting polarization-sensitive dichroic responses in both visible and near-infrared wavelengths are realized over a centimeter-scale large area. The SSRR arrays are derived from pagoda-like nanorods fabricated from the self-assembly of a lamellae-forming polystyrene-b-poly (methyl methacrylate) copolymer (PS-b-PMMA) confined in cylindrical pores of anodized aluminum oxide (AAO) template. Along the nanorod direction, PS and PMMA nanodomains were alternately stacked with the same distance. Silver crescents and semi-hemispherical covers, which are essential for SSRR with the polarization sensitivity, were obliquely deposited on the single side of the nanorod after removing the AAO template and reactive-ion etching treatment. These sophisticated nanoscale architectures made by bottom-up fabrication can be applied to structural color, optical anti-counterfeiting, and commercial optical components in a large area.

Ultrabroadband absorptive refractory plasmonics for photocatalytic hydrogen evolution reactions

“…1a. First, an AAO template with a height of 10 μm, a distance between two neighboring pores of 500 nm, and a pore diameter of 470 nm was fabricated using the two-step anodization method and widening process [31][32][33] . Then, TiO 2 (5 nm) was deposited on the AAO template through ALD.…”

Computation at the speed of light: metamaterials for all-optical calculations and neural networks

“…[174][175][176] The engineering of materials to suppress optical losses could be influential in designing meta-atoms with unity transmission, [177][178][179] allowing for highly efficient metasurfaces, and therefore, easing the limitations of how many metasurfaces can be cascaded in the hidden layers of ONNs. In addition, large-scale fabrication techniques, such as nanoimprint lithography, [180][181][182][183][184][185][186][187] holographic lithography, 188 and self-assembly, [189][190][191] could allow for the mass production of metasurfaces for ONNs. Together with advancements in nonlinear responses, 192 deep ONNs with nonlinear activation functions could be a reality.…”

Emerging low-cost, large-scale photonic platforms with soft lithography and self-assembly

“…Block copolymer self-assembly has been widely used in many research fields, such as SERS [249,250] , metamaterials [251–253] , sensors [254,255] , electrical devices [256,257] , and QDs [258,259] . In this section, we introduce certain applications of the BCP self-assembly.…”