In this communication, we describe the operating principle of a polarization-sensitive dichroic filter consisting of a multilayered photonic structure with an embedded anisotropic composite layer. Our goal is to obtain two separate narrow passbands for two mutually orthogonal polarizations of light. To that effect, we propose to combine a photonic crystal structure with a two-dimensional array of spheroidal metallic nanoparticles. The former consists of two distributed Bragg reflectors surrounding a cavity layer that ensures the existence of narrow transmission peaks (defect modes) in the photonic bandgaps of the structure. The polarization sensitivity of transmittivity and reflectivity is provided by the rectangular array of spheroidal metallic nanoparticles embedded at the center of the cavity layer, in which the excitation of surface plasmon resonances depends on the relative orientations of the anisotropy axes of the nanoparticles and the polarization direction of the incoming light wave.
The possibility of surface plasmon polaritons (SPPs) amplification and generation in a waveguiding system containing single-walled carbon nanotube (CNT) and dielectric substrate is investigated. The SPP amplification is created by applying direct current in the CNT. Using numerical simulation, the effect of the substrate on the SPP characteristics in CNT was studied and it was shown that for a substrate with a high refractive index, the SPP amplification is realized at a lower drift velocity of free carriers of the pump current. For realization of the feedback in the CNT it is proposed to use the substrate with a periodic modulation of the dielectric function.
We show the possibility of polarization-selective amplification of a defect mode in an active photonic crystal through the excitation of surface plasmon resonance in a 2D periodic array of spheroidal metallic nanoparticles embedded in the structure. The array acts as a polarizer whose spectral characteristics depend on the shape of the nanoparticles and the periodicity of the array. The modal selectivity of the amplification is due to the strong dependence of the surface plasmon assisted light scattering by the nanoparticles on the relative orientations of their anisotropy axis and the polarization direction of the incoming light wave. We show that effective defect mode suppression, for a well-chosen polarization, can be achieved if the nanoparticles array is embedded in regions of high localization of the optical field.
The generation of slow surface plasmon polaritons in a single-walled carbon nanotube is investigated theoretically. A mechanism of amplification of surface plasmon polaritons is based on the direct transfer of electromagnetic energy from a drift current in the nanotube into a surface wave.
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