Vivid Coloration and Broadband Perfect Absorption Based on Asymmetric Fabry–Pérot Nanocavities Incorporating Platinum

Abstract

Highly efficient color filtering and broadband perfect absorption are achieved by asymmetric Fabry−Peŕot nanocavities incorporating a platinum (Pt) film, which are fabricated on rigid and flexible substrates via a lithography-free deposition process. The absorption band induced by the strong resonance in the asymmetric nanocavity plays a key role in suppressing the corresponding spectral reflection with a high efficiency of over 87% in the nonresonant bands, hence yielding vivid colors. A near-perfect absorption reaching up to 99% is concurrently achieved at the resonance wavelength. The proposed nanocavity configuration features a broad absorption band mediated by an ultra-thin Pt layer and provides a substantially extended color gamut compared to other nanocavities resorting to other noble metals such as silver and gold. Flexible color filters, in conjunction with vivid color printing, are practically demonstrated to provide an outstanding operation largely independent of the angle of incidence and bending/strain in the substrate. A broadband perfect absorber integrated with an antireflection coating is also manufactured to deliver an absorption exceeding 90% in the entire visible band (from λ = 400 to 800 nm). The proposed nanocavity is expected to expedite the development of prominent applications spanning displays, color printing, stealth, and thermal photovoltaics.

Lithography-Free Plasmonic Color Printing with Femtosecond Laser on Semicontinuous Silver Films

“…[19] Although these approaches enable subwavelength resolution printing and dynamic tunability, they largely rely on expensive fabrication methodologies and are hardly industrially scalable. In this regard, contemporary studies on lithography-free optical absorbers, [20,21] resonant cavities, [22][23][24] thin-film multi-layered structures, [25][26][27] and metaldielectric composites [28,29] have gained momentum due to their scalability, sustainability, and low cost. In particular, multilayer stacks that generate Fabry-Pérot (F-P)-like resonances have been demonstrated as narrow bandwidth and saturated color filters across a broad spectral range.…”

Generation of additive colors with near unity amplitude using a multilayer tandem Fabry–Perot cavity

“…To tackle this deficiency, proposing a planar lithography-free architecture to generate RGB colors in the reflection mode is a possible solution. The use of lossy metals such as bismuth [15], nickel [16,17], and platinum [18] as the top layer in a MI-metal (MIM) design has been proposed to achieve this goal. However, the wide full-width-at-halfmaximum (FWHM) of these designs reduces the color purity.…”

Multilevel Anti-Counterfeiting Based on Covert Structural Features Embedded in Femtosecond-Laser-Treated Gold Nanocluster/Graphene Hybrid Layer

“…A near-percolation Au and oxide (SiO 2 ) layers, with thicknesses of 340 and 8 nm, respectively, sandwich a single-layer Gr. The near-percolation Au layer, which comprises NCs exhibiting random spatial distributions, is known to import LSPR into a Fabry–Pérot resonance structure based on a cavity of oxide (see Section S1, Supporting Information, for details). The LSPR can be effectively tailored by altering the shape and surrounding environment of AuNC, , which are subject to the fs-laser–AuNC interaction.…”