Fabricating defogging metasurfaces <i>via</i> a water-based colloidal route

Khoruzhenko, Olena; Dudko, Volodymyr; Rosenfeldt, Sabine; Breu, Josef

doi:10.1039/d3mh00625e

Cited by 1 publication

(1 citation statement)

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“…For example, Akselrod et al 31 demonstrated the use of colloidal synthesis to create large-area metasurfaces, paving the way for scalable and cost-effective fabrication methods. Additionally, Khoruzhenko et al 32 detailed the preparation of colloidal metasurfaces with tunable optical properties, while Petronella et al 33 demonstrated the dynamic tuning capabilities of liquid crystal-integrated metasurfaces. Lastly, Kim et al 34 introduced a hierarchical doping strategy to enhance the optical response of nanocrystal-based metasurfaces.…”

Section: ■ Introductionmentioning

confidence: 99%

Phase Singularity in Random Gold Metasurface for Refractive Index Sensing: Experimental Demonstration and Theoretical Analysis

Cuanalo-Fernández,

Korneev,

Cosme

et al. 2024

J. Phys. Chem. C

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This study delves into the phenomenon of near-zero reflectance and phase singularity within a random array of gold nanoislands, employing a combination of theoretical and experimental approaches. The nanoislands are fabricated through the thermal dewetting of ultrathin gold films deposited via magnetron sputtering onto a glass substrate. Their morphology is characterized using scanning electron microscopy and atomic force microscopy. To unravel the plasmonic behavior, we conducted measurements of reflectance and phase spectra using a common-path interferometer in an attenuated total reflectance configuration. Our analysis reveals a partial state of topological darkness in the examined sample, characterized by near-zero reflection for the p polarization component. This discovery is further substantiated by the observation of phase singularity, as evidenced by abrupt ±π phase jumps in the differential phase spectra. Moreover, our study demonstrates the utility of measuring the phase and its derivative at resonance near the singularity for highly sensitive detection of changes in the bulk refractive index of the surrounding medium. The experimental findings are rigorously validated by comparing them with analytically calculated reflectance and phase spectra using the island film theory, yielding a good agreement.

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Section: ■ Introductionmentioning

confidence: 99%