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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

diffraction coupled plasmonic resonances with the sp ectral line full-width-half-maximum as low as 5 nm and quality factors Q reaching 300, at imp ortant fibre-optic telecom wavelengths around 1.5 µm. Using these resonances, we demonstrate a hybrid graphene-plasmonic mo dulator with the mo dulation depth of 20% in reflection op erated by gating of a single layer graphene, the largest measured so far.

Optical Tamm state at the cholesteric liquid crystal/metal interface
Gulkin D.N., Bessonov V.O., Sob oleva I.V., Fedyanin A.A. Faculty of Physics, Lomonosov Moscow State University, Moscow, 119991, Russia e-mail: bessonov@nanolab.phys.msu.ru Optical Tamm state (OTS) is an optical analogue of Tamm state which is electronic density lo calization at the b oundary of p erio dic atomic p otential. The OTS app ears as electromagnetic field lo calization at the interface of photonic crystal and metal [1]. Exp erimentally the OTS app ears as a narrow dip in reflectance sp ectrum in the photonic band gap sp ectral range. Cholesteric liquid crystals (CLCs) are self-organized photonic crystals formed by ro d-like molecules arranged in a p erio dical helical structure [2]. The CLCs have a stop-band for light with the one direction of circular p olarization (the same as the CLC twist). Therefore, the app earance of OTSs is exp ected in CLC/metal structures [3, 4]. In this work the prop erties of the OTS at the CLC/gold interface are studied using 4в4 Berreman matrix metho d. The optical parameters [5] and structure of studied CLC/gold mo del are shown in Fig. 1a. The plane-parallel anisotropic dielectric layer was intro duced b etween the CLC and the metal layers. The optical axis of the anisotropic layer was laid along the planes of its interfaces with the CLC and gold layers. The calculated reflectance sp ectra of the structure are shown dep ending on thickness of anisotropic layer (Fig. 1b) and angle of incidence (Fig. 1c). The dep endence of the OTS resonance depths and sp ectral p ositions on the thickness of the anisotropic layer and the wavelength of the incident light is p erio dic. The OTS is shown to b e excited if phase of the wave transmitted through the anisotropic layer changes by /2 and the anisotropic layer acts as a quater-wave plate. The maximum value of the resonance dip is achieved at the wavelength of 780 nm when the thickness of the anisotropic layer is 2030 nm. Fig. 1c demonstrates that the OTS excitation o ccurs over a large range of angles of incidence. It also shows that photonic band gap center and the OTS disp ersion curve shifts to shorter wavelengths with incident angle increase.

Fig. 1: a -- The sketch of the studied CLC structure. E0 and E are the incident and reflected waves, resp ectively, is angle of incidence. b -- Reflectance sp ectrum of the mo deled structure dep ending on the thickness of the anisotropic layer; c -- Reflectance sp ectrum versus angle of incidence and wavelength of the radiation. References [1] B. I. Afinogenov, V. O. Bessonov, A. A. Fedyanin et al, Appl. Phys. Lett., 103, 061112 (2013). [2] J. Schmidtke, W. Stille, The European Physical Journal E, 12.4, 553564 (2003). [3] Y. C. Yang et al., Physical Review E., 60.6, 6852 (1999).

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[4] S. Y. Vetrov, M. V. Pyatnov, I. V. Timofeev, Optics letters, 39.9, 27432746 (2014). [5] J. R. Park et al., Optical review, 9.5, 207212 (2002).

Manipulating electromagnetic wave with meta-surfaces
Qiong He1, Ziqi Miao1 , Weijie Luo1, Wujiong Sun1, Lei Zhou1, Shulin Sun2 1 State Key Lab oratory of Surface Physics and Key Lab oratory of Micro and Nano Photonic Structures (Ministry of Education), Fudan University, Shanghai 200438, China 2 Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing, Green Photonics and Department of Optical Science and Engineering, Fudan University, Shanghai 200433, China e-mails: qionghe@fudan.edu.cn, phzhou@fudan.edu.cn, sls@fudan.edu.cn Metamaterials are artificially engineered materials whose optical prop erties arise primarily from their micro-structure ("meta-atom") and its macroscopic order. Metasurface, as a new emerging field of metamaterials, have aroused considerable interest due to their capability of arbitrary manipulation of the phase and amplitude profile at the interface. In this talk, we briefly summarize our recent efforts in employing meta-surfaces to control electromagnetic waves, including realizing high-efficiency photonic spin-hall effect [1] and surface-plasmon couplers [2], and controlling phases with graphene-based meta-surfaces [3].

Fig. 1: a) Schematics of the 100%-efficiency photonic spin-hall effect realized at our reflective meta-surface, b) full-range phase mo dulator based on graphene metasurfaces. References [1] Weijie Luo, et al., "Photonic Spin Hall Effect with Nearly 100% Efficiency", pap er under review. [2] Wujiong Sun, et al., "Highly efficient surface plasmon Meta-coupler", to b e submitted. [3] Ziqi Miao, et al., "Toward a Full-range Phase Mo dulation with Gate-controlled Graphene Metasurfaces", pap er under review, arXiv:1409.6845(2014).

Characterization and application of resonant prop erties of out-diffused silver nanoislands
Heisler F.1,2 , Hasan M.2, Piliugina E.3, Chervinskii S.4,5, Samusev A.2 , Lip ovskii A.3,4 1 Abb e Center of Photonics, Friedrich-Schiller-UniversitДt Jena, Max-Wien-Platz 1, 07743 Jena, Germany 2 ITMO University, St. Petersburg 197101, Russia 3 St. Petersburg Academic University, St. Petersburg 194021, Russia 4 St. Petersburg Polytechnical University, St. Petersburg 195251, Russia 5 University of Eastern Finland, P.O. Box 111 Jo ensuu, 80101, Finland e-mail: fabian.heisler@uni-jena.de Plasmonic nanoparticles used as nanoantennas [1] are nowadays undergoing deep investigations as structures, which are able to enhance the lo cal electromagnetic field thus, leading to an increased