The transmission and reflection spectra of 1D photonic crystals based on close-packed silver nanosphere monolayers separated by thin solid dielectric films are investigated in the frame of the statistical theory of multiple scattering of waves. In order to realize jointed electron and photonic confinement we choose intermonolayer film thickness so that the photonic band gap and metal nanoparticle surface plasmons are realized at close frequencies in the visible region. Photonic stopband formation is studied under these conditions at different particle sizes, concentrations and geometrical parameters of the system with regard to size dependence of metal nanoparticle dielectric function. The red shift of plasmon resonance with packing factor increasing due to the lateral coupling between close-packed metal nanoparticles within a monolayer is shown. One- dimensional ordering of monolayers gives rise to the formation of the photonic stopband in the vicinity of a plasmon absorbency resonance. The appearance of a doublet structure of attenuation spectra and narrowed reflection peak has been established.
Polarization and coherent effects for chain-ordered planar arrays of metallic nanospheres have been investigated within the framework of the model of binary interactions. The dependence of plasmon resonance frequency on the light polarization state due to the lateral electrodynamic coupling has been revealed. The effect of nanoparticle space ordering on the shape of the natural light absorption spectra have been established.
Here, we present the results of theoretical experimental studies of the light spectral selection due to the coherent multiple scattering into partially ordered mesoscopic disperse media. The role of coherent effects in random close-packages systems with short-range ordering is discussed. The concentration effects of whitening and darkening for optically soft particles are considered in terms of the amplitude-phase screen model. For close-packed monolayers of highly refracting particles the effects of coherent rescattering are analyzed using a quasi-crystalline approximation of the theory of multiple wave scattering and the radial particle distribution function obtained from the Percus-Yevick equation solution. The same theoretical approach being extended to periodic one- and 3D disperse systems describes the formation of forbidden photon zones in transmission spectra of photonic crystals. Ways of spectral properties controlling for ordered dielectric and metal nanostructures are proposed and analyzed. In addition, the theoretical description of their optical characteristics is developed. Results of quantitative calculations agree well with experimental data found for various types of scattering filters and coatings. The regularities obtained for photonic crystals seem to be fruitful for the creation of novel selective elements based on spatially ordered mesoscopic disperse systems with different structural organization.
The possibilities of controlling production processes and products by means of optical filter devices are largely determined by the quality of the filters used. The basic requirement for infrared filters designed for selecting radiation of heat sources is that they be high contrast. A promising method providing a simple and reliable constructive solution of this problem is the combining of interference systems, consisting of a small number of layers and forming a transmission band in the filter transmission region, with a scattering system effectively attenuating the background radiation in a wide spectral region.
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