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Vacuum Fluctuations in Optical Metamaterials Containing Nonlinear Dielectrics

100%
Jakšić Z., Ostojić S., Tanasković D., Matović J.
Acta Physica Polonica A
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2009
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vol. 116
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issue 4
628-630
EN
We investigated the influence of zero-point fluctuations (vacuum fluctuations, optical quantum noise) to the optical response of electromagnetic metamaterials containing dielectrics with third-order Kerr-like nonlinearity. We determined the zero-point noise and calculated it for different analytes, including those used in forensic analysis and organic pollutants. The zero-point noise level is highest for shortest-wavelength plasmons and decreases towards long-range plasmons. It may be tailored through a convenient design of the metamaterial structure. Since noise spectral power is proportional to the nonlinearity of the analyte species present, we considered the possibility to use zero-point noise as an auxiliary tool for identification of targeted nonlinear samples. We believe that our investigation could be of importance in homeland defence, forensics, biomedicine, etc.
2
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Fishnet-Based Metamaterials: Spectral Tuning Through Adsorption Mechanism

100%
Jakšić Z., Tanasković D., Matovic J.
Acta Physica Polonica A
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2009
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vol. 116
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issue 4
625-627
EN
In this work we consider the tuning of spectral reflectance of fishnet metamaterials with circular or elliptic apertures due to the presence of dielectric analyte adsorbed within the pores of the dielectric part. We simulated the electromagnetic response of the fishnet metamaterials for the optical range utilizing the finite element method. Our investigation is dedicated to ultrathin, freestanding laminated structures (metal-dielectric-metal self-supported nanomembrane sandwiches with nanometric thickness). We also investigated some issues connected with experimental fabrication of the freestanding fishnets for adsorbtion-based sensors.
3
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Surface Plasmon-Polariton Assisted Metal-Dielectric Multilayers as Passband Filters for Ultraviolet Range

100%
Jakšić Z., Maksimović M., Sarajlić M., Tanasković D.
Acta Physica Polonica A
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2007
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vol. 112
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issue 5
953-958
EN
We designed and fabricated metal-dielectric multilayers intended for passband filters in the ultraviolet range. We determined the dispersion characteristics by the Bloch approach to evanescent wave resonant coupling and calculated the spectral characteristics using the transfer matrix method while taking into account real dispersion and absorptive losses. We considered the influence of nanoscale interface roughness as a means to couple evanescent electromagnetic field to the propagating far field modes. In our structures both propagating and evanescent modes contribute to the overall performance, resulting in an enhanced transmission in the desired range, while retaining a strong suppression of undesired frequencies of more than four orders of magnitude. In our experiments we used radiofrequent sputtering of silver and silica and characterized our multilayers by UV-vis spectroscopy.
4
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Structural Characterization and Statistical Properties of Two-Dimensional Granular Systems During the Compaction

88%
Živković S., Jakšić Z., Arsenović D., Budinski-Petković L., Vrhovac S.
Acta Physica Polonica A
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2011
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vol. 120
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issue 2
246-251
EN
We study the compaction dynamics of frictional hard disks in two dimensions, subjected to vertical shaking, by numerical simulation. Shaking is modeled by a series of vertical expansions of the disk packing, followed by dynamical recompression of the assembly under the action of gravity. The second phase of the shake cycle is based on an efficient event-driven molecular-dynamics algorithm. We analyze the compaction dynamics for various values of the friction coefficient and the coefficient of normal restitution. The granular organization at local level was studied by analyzing the shape factor ξ of the local volumes, associated with a natural way of subdividing the volume into local parts - the Voronoi partition. It gives a clear physical picture of the competition between less and more ordered domains of particles during the compaction. We calculate the distribution of the shape-factor for packings at different stages of the compaction process. We have also investigated a two-dimensional granular medium experimentally. We prepared the granular packings of metallic cylinders of diameters 4, 5, and 6 mm. The distributions of the shape-factor obtained numerically for various tapping intensities are consistent with our experimental results.
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