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Peculiarities of holographic microfabrication of photonic structures in functional polymer nanocomposites
摘要： Light sensitive polymer nanocomposites may be used for holographic recording of di?ractive optical elements due to the formation of periodical refractive index modulation in the volume or/and due to the geometrical surface relief formation [1–4]. In comparison with simple organic photosensitive materials polymer nanocomposites with organic and inorganic nanoparticles possess additional variable parameters, which can upgrade the quality and functionality of the recorded elements, photonic structures including the creation of layers with different thickness, plasticity, stability, luminescence properties and not least applicability in di?erent environments, biology and medicine. The holographic recording in polymer nanocomposites consists of the simple polymerization processes as well as processes of volume di?usion, redistribution of di?erent nanoparticles [1–4]. But the in?uence of matrix, initiator compositions and properties as well as of their optical parameters, which can in?uence the level of scattered light, absorption at the selected optical wavelengths, and their interconnection with optimal recording conditions are still not investigated in detail. We elaborated few high transparent polymer nanocomposites with low light scattering levels for surface relief and volume photonic structures recording - gratings and 2D photonic structures [5]. Our last investigations showed the applicability of multi-beam interference method of holographic recording for creation of one-, two- or even three-dimensional structures on the surface and in the volume of nanocomposite layer [6]. Few initial experiments demonstrated that these nanocomposites are biocompatible. In the present paper we summarized the results of the investigations of interrelation between the initial composition of urethane-acrylate nanocomposites with silica nanoparticles, optical parameters, holographic recording and di?raction e?ciency of resulting, spatially modulated structures.
关键词： Di?ractive elements,Polymer nanocomposites,Photonic structure,Holographic recording
更新于2025-09-19 17:15:36
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Optical properties of 2D photonic structures fabricated by direct laser writing
摘要： This paper presents the results of fabrication and investigation of different 2D photonic structures with the square C4v, hexagonal C6v, and pentagonal local C5v symmetry. The samples were created using the direct laser writing technique. The number of submicron scatterers varied from 25 to 10,000, and the lattice parameters varied in different samples in the range of 0.5 μm ≤ a ≤ 8.0 μm. Our experimental and theoretical studies demonstrate that 2D photonic structures reveal many remarkable optical effects. Created ordered and disordered photonic structures demonstrate a great variety of optical phenomena observed on a far-field screen placed behind the sample. When the random fluctuations of the orientation for individual rods were introduced to the perfect fishnet photonic structure, a crossover from Laue diffraction to speckle patterns was observed and investigated.
关键词： Laue diffraction,Light scattering,Photonic structure,Direct laser writing,SEM images,Metasurface
更新于2025-09-19 17:13:59
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Dispersion tailoring of silicon nanowire optical rectangular waveguide (SNORW)
摘要： Dispersion analysis on silicon nanowire optical rectangular waveguide (SNORW) has been presented in this paper by guiding light inside low refractive index region. Dispersion engineering is an essential study to utilize any photonic integrated circuit-based waveguide in linear and nonlinear optical devices. This paper exhibits distinctive dispersion characteristics recognized in the wavelengths of S, C and L bands by tailoring physical parameters of SNORW. Modal investigation and numerical analysis have been carried out by finite element method (FEM), which shows that SNORW configuration enables the flat and low negative dispersion behavior. This paper also demonstrates the utilization of cladding materials and structural parameters of SNORW to tune the magnitude and behavior of dispersion for flat dispersion profile.
关键词： Silicon nanowire,Photonic integrated circuits,Optical waveguide,Dispersion,Silicon photonics,Photonic structure,Nanophotonics
更新于2025-09-16 10:30:52
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-point dependent electromagnetic beam propagation in a graphenelike triangular metallic photonic structure
摘要： We study the electromagnetic wave propagation in a graphenelike triangular metallic photonic structure and show that, associated to trigonally warped Dirac cones, the transport properties resulting from an incident beam at the armchair edge display drastically different behaviors as compared to the results obtained for other analogous systems. Namely, at K point, only the center beam associated to the lower Dirac cone and the side beams to the upper cone and, at K (cid:2) point, only the center beam associated to the lower cone display signi?cant intensities. The other expected beams are all strongly inhibited. This can be related to the metallic nature of the structure, where the low frequency electromagnetic bands are formed by local resonance modes con?ned inside the structural units. A propagating wave should follow the structure local patterns that govern its ?eld distribution, whose symmetry properties determine its excitation by an incident wave.
关键词： graphenelike triangular metallic photonic structure,trigonal warping,armchair edge,electromagnetic wave propagation,Dirac cones
更新于2025-09-12 10:27:22