Tunable Dichroic Self-Affine Thin Films

Naeimi, Zahra; Miri, MirFaez

doi:10.1021/jp2037922

Cited by 5 publications

(4 citation statements)

References 57 publications

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“…Our work can be extended in many directions. MO response of trimers, tetramers, two-dimensional arrangements of particles, fractal clusters, and the influence of particle size dispersion [55][56][57][58] , are of immediate interest. We envisage the optical control of the MO response of a solution of molecularly bridged dimers.…”

Section: Discussionmentioning

confidence: 99%

Faraday rotation and circular dichroism spectra of gold and silver nanoparticle aggregates

Pakdel

Miri

2012

Phys. Rev. B

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We study the magneto-optical response of noble metal nanoparticle clusters. We consider the interaction between the light-induced dipoles of particles. In the presence of a magnetic field, the simplest achiral cluster, a dimer, exhibits circular dichroism (CD). The CD of a dimer depends on the directions of the magnetic field and the light wave vector. The CD of a populous cluster weakly depends on the magnetic field. Upon scattering from the cluster, an incident linearly polarized light with polarization azimuth ϕ, becomes elliptically polarized. The polarization azimuth rotation and ellipticity angle variation are sinusoidal functions of 2ϕ. The anisotropy and the chirality of the cluster control the amplitude and offset of these sinusoidal functions. The Faraday rotation and Faraday ellipticity are also sinusoidal functions of 2ϕ. Near the surface plasmon frequency, Faraday rotation and Faraday ellipticity increase.

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Section: Discussionmentioning

confidence: 99%

Faraday rotation and circular dichroism spectra of gold and silver nanoparticle aggregates

Pakdel

Miri

2012

Phys. Rev. B

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“…As mentioned earlier, the proper solution of eq would result in Im(α ∥ ≡ 1/2⟨α i , xx + α i , yy ⟩), which describes the absorption of s-polarized light (in the x – y plane), and Im(α ⊥ ≡ ⟨α i , zz ⟩), which is proportional to the absorption of p-polarized light (in the normal z direction). Analyzing the two spectra of α ∥ and α ⊥ for a self-affine film shows a clear dichroism . α ∥ , which corresponds to longitudinal modes, shows larger values at longer wavelengths, whereas transverse modes with α ⊥ are located in the short-wavelength part of the spectrum.…”

Section: Resultsmentioning

confidence: 94%

“…Analyzing the two spectra of α || and α ┴ for a self-affine film shows a clear dichroism. 64 α || , which corresponds to longitudinal modes, shows larger values at longer wavelengths, whereas transverse modes with α ┴ are located in the short-wavelength part of the spectrum. This can be explained by the mean polarizability per particle which is mostly related to the dipole coupling between islands, and is different for in-plane and out-of-plane excitations.…”

Section: Theory and Interpretationmentioning

confidence: 97%

Simple Unbiased Hot-Electron Polarization-Sensitive Near-Infrared Photodetector

Mirzaee

Lebel

Nunzi

2018

ACS Appl. Mater. Interfaces

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Plasmonic nanostructures can generate energetic "hot" electrons from light in a broad band fashion depending on their shape, size, and arrangement. Such structures have a promising use in photodetectors, allowing high speed, broad band, and multicolor photodetection. Because they function without a band gap absorption, photon detection at any energy would be possible through engineering of the plasmonic nanostructure. Herein, a compact hot-electron-based photodetector that combines polarization sensitivity and circularly polarized light detection in the near-infrared region was fabricated using an indium tin oxide (ITO)-Au hybrid layer. Furthermore, the sensitivity of the device was significantly increased by adding a poled Azo molecular glass film in a capacitor configuration. The resulting device is capable of detecting light below the ITO band gap at ambient temperature without any bias voltage. This photodetector, which is amenable to large-area fabrication, can be integrated with other nanophotonic and nanoplasmonic structures for operation at telecom wavelengths.

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“…Here, we focused on the self-similar fractal clusters. Self-affine surfaces also deserve attention [49][50][51]. …”

Section: Discussionmentioning

confidence: 99%

Fractal aggregate of hollow spherical nanoparticles: engineering the absorption spectrum by hollow size

2014

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We study the optical properties of aggregates of hollow gold nanoparticles: monodisperse and bidisperse random gas particles and fractal cluster-cluster aggregates consisting of 1000 particles. We use the coupled-dipole equations to describe the interaction of the electromagnetic wave with particles. We find that the particle core volume fraction can be tuned to minimize the full width at half-maximum (FWHM) and to considerably shift the peak of the absorption spectrum. We find that the redshift, but not the FWHM of the peak, has a monotonic dependence on the particle core volume fraction. High pass, low pass and band rejection filters can be realized with random and fractal aggregates of hollow particles. In the case of fractal clusters, particle size dispersion has a deep influence on the overall shape of the spectrum. Thus, the aggregates of hollow nanoparticles are superior to the aggregates of solid nanoparticles: their absorption spectrum can be easily engineered by hollow size.

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Tunable Dichroic Self-Affine Thin Films

Cited by 5 publications

References 57 publications

Faraday rotation and circular dichroism spectra of gold and silver nanoparticle aggregates

Faraday rotation and circular dichroism spectra of gold and silver nanoparticle aggregates

Simple Unbiased Hot-Electron Polarization-Sensitive Near-Infrared Photodetector

Fractal aggregate of hollow spherical nanoparticles: engineering the absorption spectrum by hollow size

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