Документ взят из кэша поисковой машины. Адрес оригинального документа : http://nanolab.phys.msu.ru/sites/default/files/dd15_shilkin.pdf
Дата изменения: Unknown
Дата индексирования: Sat Apr 9 23:03:44 2016
Кодировка:

DAYS on DIFFRACTION 2015

177

Nonlinear dielectric metasurfaces and oligomers: harmonics generation and all-optical switching
M.R. Shcherbakov, A.S. Shorokhov, P.P. Vabishchevich, E.V. Melik-Gaykazyan, A.A. Fedyanin Faculty of Physics, Lomonosov Moscow State University, 119991 Moscow, Russia e-mail: shcherbakov@nanolab.phys.msu.ru D.N. Neshev, B. Hopkins, I. Staude, A.E. Miroshnichenko, Yu.S. Kivshar Nonlinear Physics Centre, Research Scho ol of Physics and Engineering, The Australian National University, Canb erra, Australian Capital Territory 0200, Australia I. Brener Center for Integrated Nanotechnologies, Sandia National Lab oratories, Albuquerque, New Mexico 87185, United States Compact yet efficient nonlinear-optical devices are a cornerstone of mo dern photonics. Wavemixing and all-optical switching pro cesses are sought for in micro- and nanostructures as those effects pave the way for a new optics-based telecommunication and data manipulation paradigm [1]. Silicon photonics is b elieved to dominate the area: microring resonators, Raman lasers and other devices are readily available to b e integrated into photonic circuits [2]. However, shrinking down the size of silicon-based devices was hardly considered feasible until it was recently realized that highly lo calized Mie-typ e mo des can b e excited in silicon nanoparticles [3]. Utilizing the Mie-typ e resonances in silicon nanospheres, nano disks and other geometries is a promising strategy to achieve high nonlinear pro cesses efficiencies at low mo de volumes. In this talk we review our recent investigations of nonlinear optical prop erties of silicon-based nanoparticles and metasurfaces. The nanostructures under study are distinguished by fundamental lo calized magnetic Mie-typ e resonances with mo de volumes as low as 3 /100. It is shown by third-harmonic generation (THG) sp ectroscopy and THG microscopy that effective third-order nonlinearities of silicon nano disk arrays are two orders of magnitude larger than those of an unstructured bulk silicon slab [4]. Arranging nanoparticles in an oligomer (trimer) geometry provides for another degree of freedom in tailoring their nonlinear-optical response [5]. Finally, pump-probe measurement results of all-optical switching in silicon-based metasurfaces will b e presented. References [1 [2 [3 [4 [5 ] ] ] ] ] J. Leuthold, C. Ko os, W. Freude, Nature Photonics, 4, 535544 (2010). B. Jalali, S. Fathp our, Journal of Lightwave Technology, 24, 46004615 (2006). A. I. Kuznetsov et al., Scientific Reports, 2, 492 (2012). M. R. Shcherbakov et al., Nano Letters, 14, 64886492 (2014). M. R. Shcherbakov et al., ACS Photonics, 10.1021/acsphotonics.5b00065 (2015).

Optical forces induced by Blo ch surface waves on a one-dimensional photonic crystal
Shilkin D.A.1, Lyubin E.V.1 , Sob oleva I.V.1,2, Fedyanin A.A.1 1 Faculty of Physics, Lomonosov Moscow State University, 119991 Moscow, Russia 2 A.N. Frumkin Institute of Physical Chemistry and Electro chemistry, Russian Academy of Science, Moscow 119991, Russia e-mail: fedyanin@nanolab.phys.msu.ru Blo ch surface waves (BSW) are surface electromagnetic mo des that propagate in all-dielectric structures and provide large lo cal field enhancement [1]. In our work, BSWs are shown to b e a promising to ol for optical manipulation of dielectric microparticles. Momentum of the BSW at a

178

DAYS on DIFFRACTION 2015

one-dimensional photonic crystal/water interface is exp erimentally demonstrated to b e transferred to a 1-µm p olystyrene microsphere lo cated in the vicinity of the photonic crystal surface. As it is observed by means of optical microscopy, the interaction force generated by the BSW is large enough for particle lo calization near the surface and propulsion along the BSW propagating direction. To measure the force quantitatively, photonic force microscopy is used. Photonic force microscopy technique is based on the determination of the particle displacement in an optical tweezers trap at an external force influence [2]. The exp eriment scheme and results of photonic force microscopy of the BSW are shown in Fig. 1. The measured force decays exp onentially with moving off the surface at large distances, but there is a surprising diminution of the force at surface/particle gaps less than 150 nm. The maximum value of 0.25 fN at the exciting radiation intensity of 1.6 kW/cm2 is observed at the BSW excitation resonance.

Fig. 1: (a) The exp eriment scheme. The calculated distribution of the incident BSW electric field amplitude is shown in green. (b) The x- (red dots) and z -co ordinate (black dots) projection value of the measured force dep ending on the distance b etween the particle and the photonic crystal surface. References [1] P. Yeh, A. Yariv, A. Y. Cho, Applied Physics Letters, 32, 104 (1978). [2] L. P. Ghislain, W. W. Webb, Optics Letters, 18, 1678 (1993).

Distributed feedback laser
V.Yu. Shishkov1,2,3, A.A. Zyablovsky1,2 , E.S. Andrianov1,2 , A.A. Pukhov1,2,3, A.P. Vinogradov1,2,3 , A.A. Lisyansky4 1 All-Russia Research Institute of Automatics, 22 Sushchevskaya, Moscow 127055, Russia 2 Moscow Institute of Physics and Technology, Moscow Region, Dolgoprudny, Russia 3 Institute for Theoretical and Applied Electromagnetics RAS, Moscow, Russia 4 Department of Physics, Queens College of the City University of New York, Flushing, NY 11367 e-mail: vladislavmipt@gmail.com We consider lasing in one dimensional photonic crystal, which primitive cell consists of two layers: MaxwellBlo ch-like active layer and passive layer. It is shown that when lasing starts the effective dielectric structure loses its p erio dicity b ecause the Blo ch mo de is not p erio dic. However, at the band-edge where the Blo ch mo de is p erio dic and its p erio d is equal to the photonic crystal cell size, the distribution of electromagnetic field in photonic crystal b ecomes also spatial p erio dic. Besides, due to Borrmann effect electromagnetic field tends to concentrate in the passive or active layers of