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Simultaneously measurements of the second harmonic generation (SHG) signals in the forward and backward directions from deep shade plants were achieved. These measurements show that the deep shade plants produce high SHG signal in both directions and the SHG signals strongly depend on the state of the polarization of the laser light and the orientation of the dipole moment in the molecules that interact...
Due to current crowding, the laser emission in medium size VCSELs starts at threshold in a linearly polarized ldquoflower moderdquo concentrated at the laser aperture periphery. Introducing a holding beam with orthogonal liner polarization we observe localized structure in the center of the device in the orthogonal polarization while the VCSEL keeps lasing in the same flower-mode. We support theoretically...
In this paper we discuss eigenmodes propagating in plasmonic coaxial waveguides of nano-scale dimensions. Plasmonic nano-cables with an elliptic shape of a central rod are proposed. Break of the azimuthal symmetry makes it easier to excite dipole-type modes. We show that waveguides with central rods, having shapes of crossed ellipses, can be used for transfer of optical signals with orthogonal polarizations...
Circular dielectric cavities are key components for the construction of optic microresonators and microlasers. They are one of very few cases where the transcendental equations for complex eigenmodes (resonances) of an open system (dielectric cavity) can be found analytically in an exact manner. The behaviour of those eigenvalues in the small opening limit, i.e. when the refractive index of the cavity...
Nano-patterned metal surfaces on dielectric substrates are become very important in nanoscale optical devices such as molecular sensors, second harmonic emitters, negative index materials. Among these, self-organised approaches are a promising alternative to the conventional lithographic or scanning lithography methods, since allow low cost patterning of large macroscopic surface in a single step...
In this paper, the evidence of a polarized and room temperature single photon emission from wet-chemically synthesized colloidal dot-in-a-rod is reported. The time and polarization resolved measurements clearly indicate a high degree of linear polarization and a lifetime of ~11 ns. We report also about a viable strategy to develop single photon sources with polarization control for quantum cryptography.
In this communication we present technical details of performance of recently proposed silver nanolens which transforms a far-field source into a far-field focus [P. Wrobel, J. Pniewski, T.J. Antosiewicz, T. Szoplik, ldquoFocusing radially polarized light by concentrically corrugated silver film without a holerdquo Phys. Rev. Lett., in print (2009)]. The nano-lens is a free standing silver nanolayer...
We demonstrate first experimental evidence of polarization switching in Stranski-Krastanov (SK) and submonolayer (SML) quantum dot (QD) vertical-cavity surface-emitting lasers (VCSELs). In the case of a SMLQD VCSEL polarization switching is accompanied by polarization mode hopping and is associated with a change of linearly polarized light to elliptically polarized one, hence switching takes place...
The digital equalization of fibre impairments in coherent optical communications allows for ultimate limits of spectral efficiency to be achieved, while reducing the cost and complexity compared to optical based solutions. Digital backpropagation (BP) was proposed recently as a reduced complexity approach for jointly compensating linear and non-linear impairments in single polarization coherent optical...
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