Percolation threshold determination of sputtered silver films using Stokes parameters and in situ conductance measurements

Hafezian, Soroush; Baloukas, Bill; Martinů, L.

doi:10.1364/ao.53.005367

Cited by 5 publications

(3 citation statements)

References 44 publications

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“…4(a). Starting with samples fabricated as described above, we then deposited a second Ag film, 5 nm thick to be below the percolation threshold of ~6 nm 44 , on top of the random nanopattern that results from the aforementioned annealing process. Optical characterization, as shown by the purple curve in Fig.…”

Section: Resultsmentioning

confidence: 99%

Ultra-broadband enhancement of nonlinear optical processes from randomly patterned super absorbing metasurfaces

Zhang

Cheney

et al. 2017

Sci Rep

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Broadband light trapping and field localization is highly desired in enhanced light-matter interaction, especially in harmonic generations. However, due to the limited resonant bandwidth, most periodic plasmonic nanostructures cannot cover both fundamental excitation wavelength and harmonic generation wavelength simultaneously. Therefore, most previously reported plasmonic nonlinear optical processes are low in conversion efficiency. Here, we report a strong enhancement of second harmonic generation based on a three-layered super absorbing metasurface structure consisting of a dielectric spacer layer sandwiched by an array of random metallic nanoantennas and a metal ground plate. Intriguingly, the strong light trapping band (e.g. >80%) was realized throughout the entire visible to near-infrared spectral regime (i.e., from 435 nm to 1100 nm), enabling plasmonically enhanced surface harmonic generation and frequency mixing across a broad range of excitation wavelengths, which cannot be achieved with narrow band periodic plasmonic structures. By introducing hybrid random antenna arrays with small metallic nanoparticles and ultra-thin nonlinear optical films (e.g. TiO2) into the nanogaps, the nonlinear optical process can be further enhanced. This broadband light-trapping metastructure shows its potential as a building block for emerging nonlinear optical meta-atoms.

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Section: Resultsmentioning

confidence: 99%

Ultra-broadband enhancement of nonlinear optical processes from randomly patterned super absorbing metasurfaces

Zhang

Cheney

et al. 2017

Sci Rep

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“…Surface morphology of ultrathin metal lms is particularly important for their electrical and optical properties, as it was already shown that discontinuous formations such as islands, grains, or perforations might have a detrimental effect on transparency and resistance. [31][32][33][34] Deposition of nucleation layer has been recognized as an effective approach to improve the homogeneity of the metal lm. Metal oxides or ultrathin metal layer is typically introduced to assure continuous layer growth, although other techniques, e.g.…”

Section: Mam Multilayer Optimizationmentioning

confidence: 99%

Quantum-dot light-emitting diode with ultrathin Au electrode embedded in solution-processed phosphomolybdic acid

et al. 2019

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“…We studied the influence of the morphology of the molecular layer on the plasmon resonance excitation mechanisms and their polarization properties in assemblies using Fourier-Transform Infrared Spectroscopy (FTIR), UV-vis near-infrared spectroscopy, and modulation-polarization spectroscopy (modulation polarimetry) [40,41].…”

Section: Introductionmentioning

confidence: 99%

Gold Nanoparticle Self-Aggregation on Surface with 1,6-Hexanedithiol Functionalization

et al. 2020

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Here we study the morphology and the optical properties of assemblies made of small (17 nm) gold nanoparticles (AuNPs) directly on silicon wafers coated with (3-aminopropyl)trimethoxysilane (APTES). We employed aliphatic 1,6-hexanedithiol (HDT) molecules to cross-link AuNPs during a two-stage precipitation procedure. The first immersion of the wafer in AuNP colloidal solution led mainly to the attachment of single particles with few inclusions of dimers and small aggregates. After the functionalization of precipitated NPs with HDT and after the second immersion in the colloidal solution of AuNP, we detected a sharp rise in the number of aggregates compared to single AuNPs and their dimers. The lateral size of the aggregates was about 100 nm, while some of them were larger than 1μm. We propose that the uncompensated dipole moment of the small aggregates appeared after the first precipitation and acts further as the driving force accelerating their further growth on the surface during the second precipitation. By having such inhomogeneous surface coating, the X-ray reciprocal space maps and modulation polarimetry showed well-distinguished signals from the single AuNPs and their dimers. From these observations, we concluded that the contribution from aggregated AuNPs does not hamper the detection and investigation of plasmonic effects for AuNP dimers. Meantime, using unpolarized and polarized light spectroscopy, the difference in the optical signals between the dimers, being formed because of self-aggregation and the one being cross-linked by means of HDT, was not detected.

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Percolation threshold determination of sputtered silver films using Stokes parameters and in situ conductance measurements

Cited by 5 publications

References 44 publications

Ultra-broadband enhancement of nonlinear optical processes from randomly patterned super absorbing metasurfaces

Ultra-broadband enhancement of nonlinear optical processes from randomly patterned super absorbing metasurfaces

Quantum-dot light-emitting diode with ultrathin Au electrode embedded in solution-processed phosphomolybdic acid

Gold Nanoparticle Self-Aggregation on Surface with 1,6-Hexanedithiol Functionalization

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