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INTERNATIONAL CONFERENCE

DAYS ON DIFFRACTION 2015

ABSTRACTS

May 25 ­ 29, 2015 St. Petersburg

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DAYS on DIFFRACTION 2015

(Fig. 1(a)), we show that in contrary to the free space scenario the uniform wavefronts (Fig. 1(b)). The dip ole paves a way for investigati Fig. 1(c,d) shows the electromagnetic scattering in the empty cloak and The similarity b etween transmitted wave fronts verifies the validity of References [1] J. B. Pendry, D. Schurig, D. R. Smith, Science 312 1780, (2006). [2] U. Leonhardt, Science 312 1777, (2006).

radiation patterns have flat on more complex geometries. the one with an ob ject inside. the general concept.

Femtosecond Faraday evolution in one-dimensional photonic structures
Margarita I. Sharip ova, Alexander I. Musorin, Tatyana V. Dolgova, Andrey A. Fedyanin Faculty of Physics, Lomonosov Moscow State University, Moscow, Russia e-mail: sharipova@nanolab.phys.msu.ru Faraday effect is a phenomenon widely used for light propagation control. The effect is nonrecipro cal and prop ortional to the thickness of a magnetic medium. Thus, it can b e enhanced in multilayered structures with artificial disp ersion and group delay, such as magnetophotonic crystals. In case of short femtosecond laser pulse its front part interacts with the structure less effectively than the rear one. Until now, however, ultrafast dynamics of magneto-optical effects has always been connected with magnetization changes. The goal of the work is to demonstrate Faraday effect evolution caused by the pulse interference in the layered structure.

Fig. 1: Up: Exp erimental setup consists of correlation technique, augmented with p olarizationsensitive elements. Down: Auto correlation function of the laser pulse. To detect the time dep endence of Faraday rotation, auto correlation technique has b een used (see Fig. 1). We measured auto correlation function of the 130-fs laser pulse with tunable central wavelength, which passed through magneto-photonic crystal with the center of micro cavity mo de at the 895 nm. We detected ultrafast Faraday rotation dynamics in a magnetophotonic micro cavity. It is caused by the pulse self-interference inside its layers. The character of dynamics strongly dep ends on sp ectral p osition of the pulse central wavelength due to the strong artificial disp ersion of the medium. The time derivative of Faraday rotation is the greatest when pulse central wavelength is at the center of micro cavity mo de and much less when it is in the vicinity of this p oint. References [1] A. V. Chetvertukhin, M. I. Sharip ova, A. G. Zhdanov, T. B. Shapaeva, T. V. Dolgova, A. A. Fedyanin, Journal of Applied Physics, 111, 07A944 (2012). [2] A. I. Musorin, P. V. Perep elkin, M. I. Sharip ova, A. V. Chetvertukhin, T. V. Dolgova, A. A. Fedyanin, Bul letin of the Russian Academy of Sciences. Physics, 78, 43­48 (2014).

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