Investigation of nonlinear response of negative index metamaterials
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2020-11-09 20:01
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SHOROHOV, A., SHCHERBAKOV, M., HELGERT, C., CHIPOULINE, A., PERTSCH, T., FEDYANIN, A.. Investigation of nonlinear response of negative index metamaterials. In: Materials Science and Condensed Matter Physics, Ed. 6, 11-14 septembrie 2012, Chișinău. Chișinău, Republica Moldova: Institutul de Fizică Aplicată, 2012, Editia 6, p. 200. ISBN 978-9975-66-290-1.
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Materials Science and Condensed Matter Physics
Editia 6, 2012
Conferința "Materials Science and Condensed Matter Physics"
6, Chișinău, Moldova, 11-14 septembrie 2012

Investigation of nonlinear response of negative index metamaterials


Pag. 200-200

Shorohov A.1, Shcherbakov M.1, Helgert C.2, Chipouline A.2, Pertsch T.2, Fedyanin A.1
 
1 Lomonosov Moscow State University,
2 Institute of Applied Physics – Friedrich Schiller University
 
Disponibil în IBN: 23 martie 2020


Rezumat

Plasmon-active structures usually represent nanostructured films of noble metals which gain optical properties not observable for bulk metallic medium due to their subwavelength patterning. These artificial composite materials are usually referred to as so-called metamaterials. It was shown recently that depending on their geometry metamaterials possess unique optical properties that can be used for optical cloaking [1], superlens [2] and negative refraction [3]. These structures also have a great potential for ultrafast all-optical switching [4]. In contrast to the linear optical properties of metamaterials with negative refraction, which are well understood, their nonlinear optical properties began to attract the attention of researchers only recently. Experiments are largely limited to the optical harmonic generation in such metamaterials [5]. In this paper we study the nonlinear absorption in metamaterials such as fishnet [6]. Such a metamaterial is a cellular structure of layers of noble metal thicknesses of the order of several tens of nanometers and a typical period of several hundreds nanometers separated by an insulating layer thickness of several tens of nanometers. It was shown that such structures possess an effective negative refractive index in the near infrared region of the electromagnetic spectrum that is associated with the excitation of the effective magnetic resonance, due to excitation of surface plasmons in the metamaterial [7]. We determine the nonlinear absorption coefficient for a fishnet metamaterial for different polarizations of the incident radiation using open aperture I-scan technique. For the polarization corresponding to excitation of magnetic resonance the nonlinear absorption coefficient value equals 2.8*10-3 cm/W while for the orthogonal polarization its value was 5 times less. This demonstrates a significant dependence of the nonlinear properties of such structures on the polarization of electromagnetic radiation. This effect is associated to the increase of the local fields induced by the magnetic resonance in such structures. We also investigate ultrafast dynamics of transmittance of such structures using pump-probe scheme from femtosecond to picosecond time region. The dynamics of electron thermalization, electron-phonon and phononphonon relaxation are well-separated in time that can be used for creating ultrafast all-optical switching devices.