Mechanisms of perfect absorption in nano-composite systems

Mader, Sebastian; Martin, Olivier J. F.

doi:10.1364/oe.26.027089

Cited by 8 publications

(2 citation statements)

References 45 publications

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“…The giant absorption of NP n ML-on-mirror films (reflection < 5%), relative to the perfectly ordered case (Supplementary Information Fig. S8 ), is due to the bottom mirror preventing transmission and the disorder-induced scattering loss 28 . The mirror at the bottom surface enforces a field-null here, which sets the fundamental Fabry-Perot mode resonant condition λ n = 4 L , where is the thickness of the NP n ML 18 .…”

Section: Resultsmentioning

confidence: 99%

Giant mid-IR resonant coupling to molecular vibrations in sub-nm gaps of plasmonic multilayer metafilms

et al. 2022

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Nanomaterials capable of confining light are desirable for enhancing spectroscopies such as Raman scattering, infrared absorption, and nonlinear optical processes. Plasmonic superlattices have shown the ability to host collective resonances in the mid-infrared, but require stringent fabrication processes to create well-ordered structures. Here, we demonstrate how short-range-ordered Au nanoparticle multilayers on a mirror, self-assembled by a sub-nm molecular spacer, support collective plasmon-polariton resonances in the visible and infrared, continuously tunable beyond 11 µm by simply varying the nanoparticle size and number of layers. The resulting molecule-plasmon system approaches vibrational strong coupling, and displays giant Fano dip strengths, SEIRA enhancement factors ~ 106, light-matter coupling strengths g ~ 100 cm−1, Purcell factors ~ 106, and mode volume compression factors ~ 108. The collective plasmon-polariton mode is highly robust to nanoparticle vacancy disorder and is sustained by the consistent gap size defined by the molecular spacer. Structural disorder efficiently couples light into the gaps between the multilayers and mirror, enabling Raman and infrared sensing of sub-picolitre sample volumes.

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Section: Resultsmentioning

confidence: 99%

Giant mid-IR resonant coupling to molecular vibrations in sub-nm gaps of plasmonic multilayer metafilms

et al. 2022

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“…[1][2][3][4][5][6] Such systems can be as simple as a single metal particle, where material, size, shape, and refractive index of the surrounding medium determine the color impression of the particle. [7][8][9][10][11] Indeed, all these parameters influence the absorption amplitude and the wavelength of the localized plasmon resonance within the particle. [12,13] On the other hand, one can also use a system supporting propagating surface plasmon-polaritons or in short surface plasmons.…”

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confidence: 99%

Remarkable Color Gamut Enhancement of Dye Lacquers Using Corrugated Surfaces

Mader

Martin

2021

Advanced Photonics Research

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Producing colors with colorless metals such as silver or aluminum is a fascinating application of plasmonic systems. [1][2][3][4][5][6] Such systems can be as simple as a single metal particle, where material, size, shape, and refractive index of the surrounding medium determine the color impression of the particle. [7][8][9][10][11] Indeed, all these parameters influence the absorption amplitude and the wavelength of the localized plasmon resonance within the particle. [12,13] On the other hand, one can also use a system supporting propagating surface plasmon-polaritons or in short surface plasmons. [14][15][16] These systems are often periodic at a length scale below the wavelength of visible light and have been optimized for color generation in transmission [17][18][19] as well as reflection, [20,21] where recently polarization-tunable colors were demonstrated. [22,23] In that case of periodic systems, the color is mainly determined by the material, periodicity, shape, and the refractive index of the surrounding medium. [24] The color generation of plasmonic systems is based on absorption due to the excitation of surface plasmons and not on an interference-based effect, where the periodicity determines the wavelengths which can excite surface plasmons. [14] In this article, we generate vivid colors by strongly enhanced absorption of dye lacquers applied conformally on square crossed metallic grating surfaces with identical periodicity in both dimensions. [25] Unlike previously published works, we focus here not only on the generation of color by the grating itself, [20,21] but explore its possible interactions with a dye lacquer to strongly enhance the dye absorption. Instead of the conventional approach that consists in embedding a plasmonic system in a nonabsorbing dielectric medium, [1,20] we apply a partially absorbing dye lacquer conformally and in direct contact to the grating surface.This idea is inspired by works of others, who measured a significant fluorescence emission enhancement for molecules placed at well-defined distances atop a metallic grating. [26,27] This concept was also used for light extraction to improve the efficiency of a light-emitting diode. [28] Instead of fluorescence emission, we focus here on the enhanced absorption of submicrometer thick (semi-) transparent dye lacquers applied conformally to metallic crossed gratings. Rather than varying the distance of the absorbing material to the metal surface, we vary the thickness and extinction coefficient κ of these lacquers. This detailed study reveals the mechanisms of enhancing absorption within the dye lacquer. The findings are not limited to color generation and may find applications in other fields, such as solar cell absorption improvement, [29] Raman spectroscopy, [30] or highly sensitive sensing applications. [31] 2. Results and Discussion 2.1. Measurement and Simulation of Gratings Self-Color

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