Leonid A. Golovan

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Random lasers are a developing class of light sources that utilize a highly disordered gain medium as opposed to a conventional optical cavity. Although traditional random lasers often have a relatively broad emission spectrum, a random laser that utilizes vibration transitions via Raman scattering allows for an extremely narrow bandwidth, on the order of(More)
In this letter, we, for the first time, report on coherent anti-Stokes Raman scattering (CARS) spectroscopy of an ensemble of silicon nanowires (SiNWs) formed by wet chemical etching of crystalline silicon with a mask of silver nanoparticles. The fabricated SiNWs have diameter ranged from 30 to 200 nm and demonstrate both visible and infrared photolumine(More)
We study the structure and optical properties of arrays of silicon nanowires (SiNWs) with a mean diameter of approximately 100 nm and length of about 1-25 μm formed on crystalline silicon (c-Si) substrates by using metal-assisted chemical etching in hydrofluoric acid solutions. In the middle infrared spectral region, the reflectance and transmittance of the(More)
Among open resonators of mesoscopic size, we have shown recently that broad waveguides with Littrow diffraction at one of their boundaries could produce a set of sharp resonances in a silicon-on-insulator implementation at 1550 nm. We draw here two perspectives: firstly, we make use of a fundamental theory initially proposed in 1995 by Demkov and Ostrovsky,(More)
We shall present the properties of "Littrow modes" in broad periodic waveguides that we recently demonstrated in SoI samples. In the band picture they correspond to multimode slow light. In the resonator picture, they mainly behave as Fabry-Perot resonators. However, there are several subtleties in their quasi-optics behaviour that we will discuss, from(More)
The photoluminescence (PL) of CdSe quantum dots (QDs) that form stable nanocomposites with polymer liquid crystals (LCs) as smectic C hydrogen-bonded homopolymers from a family of poly[4-(n-acryloyloxyalkyloxy)benzoic acids] is reported. The matrix that results from the combination of these units with methoxyphenyl benzoate and cholesterol-containing units(More)
L.A. Golovan, M.M. Kholodov, D.E. Presnov, A.I. Efimova, L.A Osminkina, S.V. Zabotnov, V.Yu. Timoshenko, A.V. Neskoromnaya, G.I.Petrov, V.V.Yakovlev Physics Department, M.V.Lomonosov Moscow State University, 119991, Moscow, Russia Material Sciences Department, M.V. Lomonosov Moscow State University, Moscow 119991, Russia Department of Biomedical(More)
Anisotropic photonic crystal structures consisting of birefringent porous silicon layers with alternating porosity were fabricated. The in-plane birefringence formed as a result of anisotropic etching in Si(110) results in unique multilayered structures with two distinct photonic bandgaps for orthogonal light polarizations. Nonlinear optical studies based(More)
E. Yu. Krutkova, V. Yu. Timoshenko*, L. A. Golovan, P. K. Kashkarov, E. V. Astrova**, T. S. Perova, B. P. Gorshunov, A. A. Volkov Physics Department, Lomonosov Moscow State University, 119992 Moscow, Russia; Ioffe Physical Technical Institute, Polyteknicheskaya 26, St. Petersburg, 194021, Russia; Department of Electronic & Electrical Engineering, Trinity(More)
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