Typical Characteristics of Optical Thin Film Filters with Metallic Nanoparticles

Nonaka, Shigehiko; Suda, Tatsuya; Oda, Hiromitu

doi:10.1143/jjap.41.4538

Cited by 8 publications

(5 citation statements)

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“…Such films are of increasing technological importance in a variety of topical areas depending on the extent of the film surface coverage. Nanoparticulate films exhibiting strong plasmon polariton resonances are utilized as optical filters [1] and in sensor applications [2]. Percolated films are utilized as low emissivity coatings due to their infrared absorption [3].…”

Section: Introductionmentioning

confidence: 99%

Evolution of plasmon resonances during plasma deposition of silver nanoparticles

Oates¹,

Mücklich²

2005

Nanotechnology

107

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In situ real-time spectroscopic ellipsometry is used to monitor the growth of magnetron sputtered silver nanoparticles on SiO 2 substrates, through the percolation threshold and into the bulk film regime. The plasmon polariton resonances in the nanoparticulate regime are effectively modelled by a Lorentz oscillator. The resonance energy of the oscillator is observed to reduce to zero shortly after the percolation threshold, whereby the oscillation is described by Drude free electron theory. From the Drude theory, the electronic mean free path is observed to increase dramatically at the percolation threshold, to a value of 16 nm in the bulk regime, in good agreement with x-ray diffraction and transmission electron microscope measurements of the crystallite size in the films. Shortly before the percolation threshold the data is better modelled by two Lorentz oscillators, attributed to coupling between the plasmon polaritons. The onset of the coupling is determined to occur at a surface area coverage of 52%.

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Section: Introductionmentioning

confidence: 99%

Evolution of plasmon resonances during plasma deposition of silver nanoparticles

Oates¹,

Mücklich²

2005

Nanotechnology

107

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“…For example, metal nanostructures have been proposed to enhance light emission of midinfrared sources 1 as well as lightemitting diodes, 2 to improve the resolution in spectroscopy and microscopy, 3 and to serve as passive optical devices such as filter. 4,5 Another field of application for metal nanostructures is surface-enhanced Raman scattering (SERS) applied to the detection or sensing of ultralow concentrations of molecules. 6 When molecules are adsorbed at coinage metal nanoparticles, the Raman signal of the adsorbed species can be enhanced by factors on the order of 10 14 -10 15 due to the interaction with the nanoparticle enabling the detection of single molecules.…”

Section: Introductionmentioning

confidence: 99%

In situ surface-enhanced Raman spectroscopy of monodisperse silver nanowire arrays

Sauer

Brehm

Schneider

et al. 2004

Journal of Applied Physics

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Highly ordered two-dimensional arrays of monodisperse coinage metal nanowires embedded in an alumina matrix have been prepared. When light is propagating in the direction of the long axis of the nanowire, plasmon-enhanced absorption and light guidance of the nanowire were observed by optical microspectroscopy and scanning near-field optical spectroscopy and compared to Mie scattering theory. By selectively dissolving the matrix at a constant etching rate, we detected in situ and ex situ the surface-enhanced Raman scattering (SERS) of organic dyes. In contrast to earlier publications, we find that the SERS signal is linearly proportional to the free-surface area of the nanowires that are in contact with the dye. We cannot detect any change in the enhancement factor due to the releasing of the nanowires from the host structure.

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“…The applications of metal films in many fields depend on surface coverage or thickness. Nanoparticle (NP) films with strong surface plasmon resonance (SPR) can be used for applications such as surface-enhanced Raman spectroscopy, optical filters, optical sensors, and thin-film solar cells. , Percolated films are utilized as low-emissivity coatings owing to their infrared (IR) absorption . Ultrathin continuous films can be applied in transparent heat mirrors to ensure a high reflection in the IR range .…”

Section: Introductionmentioning

confidence: 99%

Characterization on Percolation of Nanostructured Silver Films by the Topological Properties of Spectroscopic Ellipsometric Parameter Trajectories

et al. 2020

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Silver (Ag) films with different nanostructures were prepared by electron beam evaporation and characterized by spectroscopic ellipsometry in combination with X-ray diffraction and field emission scanning electron microscopy (FESEM). The percolation threshold and the nanostructures of Ag films can be deduced from the measured ellipsometric parameters (Ψ, Δ). According to the different topological properties of (Ψ, Δ) trajectories, the percolation threshold of Ag films was determined to lie between the coverage of 66 and 79.6%. The result was further confirmed by the plus−minus sign of the real part of the dielectric function in the infrared. Silver particles, coalescence, networks, and continuous nanostructures were clearly identified from the topological properties of the tangent azimuth of (Ψ, Δ) trajectories, which were verified by the FESEM results. This work is useful for monitoring the fabrication of nanostructure materials in the industry and research field. In addition, it has potential applications on the recognition of micro−nanostructures in the artificial intelligence field.

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Typical Characteristics of Optical Thin Film Filters with Metallic Nanoparticles

Cited by 8 publications

References 0 publications

Evolution of plasmon resonances during plasma deposition of silver nanoparticles

Evolution of plasmon resonances during plasma deposition of silver nanoparticles

In situ surface-enhanced Raman spectroscopy of monodisperse silver nanowire arrays

Characterization on Percolation of Nanostructured Silver Films by the Topological Properties of Spectroscopic Ellipsometric Parameter Trajectories

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