NPCS Vol.15, no.4, pp. 312-415 (2012) https://elib.bsu.by:443/handle/123456789/173444 2026-04-21T05:10:17Z 2026-04-21T05:10:17Z Liidge, Kathv Lingnau, Benjamin Otto, Christian Seholl, Eckehard https://elib.bsu.by:443/handle/123456789/174013 2021-11-12T10:59:43Z 2012-01-01T00:00:00Z

Заглавие документа: Understanding Electrical and Optical Modulation Properties of Semiconductor Quantum-Dot Lasers in Terms of Their Turn-On Dynamics Авторы: Liidge, Kathv; Lingnau, Benjamin; Otto, Christian; Seholl, Eckehard Аннотация: The optical modulation properties of a semiconductor quantum-dot laser, as observed under optical injection, depend crucially on the internal carrier-carrier scattering processes within the device. In this paper we show that in order to predict the modulation properties of the laser it is most important to know the dynamics observed during the laser turn-on. In contrast to quantum-well lasers the turn-on damping of quantum-dot devices depends strongly nonlinear on the carrier-scattering lifetimes. Thus, different QD laser devices with internally scattering processes taking place on completely different time scales, can yield equal injection dynamics due to a qualitatively similar turn-on dynamics.

2012-01-01T00:00:00Z Pankov, A. A. Tsytrinov, A. V. https://elib.bsu.by:443/handle/123456789/173973 2021-11-12T10:59:35Z 2012-01-01T00:00:00Z

Заглавие документа: Identification of Sneutrino s-Channel Exchange Signatures in R-Parity Violating SUSY at a Linear Collider with Polarized Beams Авторы: Pankov, A. A.; Tsytrinov, A. V. Аннотация: We study the possibility of uniquely identifying the indirect effects of s-channel sneu-trino exchange predicted by supersymmetric theories with R-parity violation against other new physics scenarios in process e+e− → µ+µ− at the International Linear Collider. These competitive models are interactions based on four-fermion contact interactions, unparticles, gravity in large and in TeV-scale extra dimensions, anomalous gauge couplings and Z' vector bosons. We use a double polarization asymmetry to evaluate the identification reach on sneutrino exchange. The availability of polarized beams plays a crucial role in identifying s-channel sneutrino exchange signature.

2012-01-01T00:00:00Z Grigorieva, Elena V. Kaschenko, Ilya S. Kaschenko, Sergey A. https://elib.bsu.by:443/handle/123456789/173914 2021-11-12T10:59:33Z 2012-01-01T00:00:00Z

Заглавие документа: Dynamics of Lang-Kobayashi Equations with Large Control Coe cient Авторы: Grigorieva, Elena V.; Kaschenko, Ilya S.; Kaschenko, Sergey A. Аннотация: We study the system of delayed di˙erential equations modeling the dynamics of semiconductor laser with optical feedback (Lang-Kobayashi model). In the case of instability of external cavity modes we derive the ensembles of quasi-normal forms which appear to be the parabolic (or degenerate parabolic) partial di˙erential equations for slowly varied amplitude of the electric field. Coexistence of a large number of multi-frequency oscillatory regimes is discussed.

2012-01-01T00:00:00Z Romanov, Oleg G. Tolstik, Alexei L. Fanjul-Velez, Felix Ortega-Quijano, Noe Salas-Garcia, Irene Arce-Diego, Jose Luis https://elib.bsu.by:443/handle/123456789/173912 2021-11-12T10:59:37Z 2012-01-01T00:00:00Z

Заглавие документа: Modeling of Light Propagation in Turbid Media: Application to Biological Tissues Авторы: Romanov, Oleg G.; Tolstik, Alexei L.; Fanjul-Velez, Felix; Ortega-Quijano, Noe; Salas-Garcia, Irene; Arce-Diego, Jose Luis Аннотация: Light propagation in turbid media is specifically relevant in the field of biomedical optics, as biological tissues are strongly turbid media. Diagnostic or treatment applications require information regarding the spatial distribution of optical energy. This is crucial for planning the therapeutic e˙ect or the quality of the diagnostic images obtained. In this work we compare two numerical approaches for light propagation in biological tissues: the Monte Carlo approach, and the approach based on direct numerical solution of Maxwell equations by finite-di˙erence time-domain method. The results of both approaches are discussed.

2012-01-01T00:00:00Z