Plasmonics and nanophotonics VI

10:20 : Non-Bragg gap solitons and absorption effects in Kerr-metamaterial periodic and Fibonacci heterostructures

Ernesto Reyes-Gomez (1),Solange Bessa Cavalcanti (2),Luiz Eduardo Oliveira (3)

(1)Universidad de Antioquia UdeA (Colombia) , (2)Universidade Federal de Alagoas (Brazil) , (3)Universidade Estadual de Campinas (Brazil)

A detailed study of non-Bragg gap solitons in one-dimensional Kerr-metamaterial periodic and Fibonacci heterostructures is performed. The transmission coefficient is numerically obtained by considering the loss effects in the metamaterial slabs. A switching from states of no transparency in the linear regime to high-transparency states in the nonlinear regime is observed for both zero-order and plasmon-polariton gaps. The spatial localization of the non-Bragg gap solitons are also examined and the symmetry properties of the soliton waves are briefly discussed.
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10:35 : Super-Collimation of Light Beyond Heisenberg's Uncertainty Principle

Kuan-Ren Chen, Jian-Shiung Hong

National Cheng Kung University (Taiwan)

Heisenberg's Uncertainty Principle is based on a smooth wave function without involving phase and sub-wavelength scale. The resultant wave function of light transmitted through a sub-wavelength slit may not be smooth, also, it involves length and phase in sub-wavelength scale. With plasmonic sub-wavelength structures in a metallic film, super-collimated light beam can be produced. As a fundamental scientific breakthrough, this novel phenomena and physics are studied by analytics, simulation and experiment.
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10:50 : Strong coupling from few molecules in self-assembled plasmonic nanostructures

Rohit Chikkaraddy, Bart Nijs, Felix Benz, Oren Scherman, Jeremy Baumberg

University of Cambridge (United Kingdom)

We report the interaction of tightly localized plasmons and absorption resonances of few (~10-20) isolated methylene blue molecules in the strong coupling regime. Ultra-small mode volumes in self-assembled nanoparticle-on-mirror geometry are coupled to molecular resonances with controlled orientation of dipoles to induce strong coupling. Dark-field and surface enhanced Raman scattering measurements (SERS) show plasmon-exciton coupling at the nanoparticle gaps. Dispersion curves obtained from analysis of ~100 nanoparticles, show anticrossing behavior with Rabi splittings ranging from 120-260meV at room temperature.
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11:05 : Mask-less recycling of highly efficient electron-beam defined three dimensional SERS substrates

M. Chirumamilla, A. Gopalakrishnan, A. Toma, R. Proietti Zaccaria, F. De Angelis, R. Krahne

Istituto Italiano di Tecnologia (Italy)

Top-down fabrication of electron-beam lithography defined metallic nanostructures is a successful route to obtain extremely high electromagnetic field enhancement via plasmonic effects in well-defined regions. We present three-dimensional nano-array devices that can be recycled via a mask-less metal etching and deposition processes, due to conservation of the nanostructure pattern in the 3D geometry of the underlying substrate. Surface Enhanced Raman Scattering at extremely low density up to the limit of few molecules is demonstrated.
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11:20 : Partial decorrelation between TPL and SHG: a direct evidence for nonlocal bulk sources in noble metal nanostructures

L. Olgeirsson (1),S. Waterman (1),S. Huant (1),A. Bouhelier (2),J. Sharma (3),E. Dujardin (3),Guillaume Bachelier (1)

(1)Joseph Fourier University (France) , (2)Bourgogne University (France) , (3)CEMES - CNRS Toulouse (France)

Spatially resolved optical second harmonic generation (SHG) is reported for single gold nanoprisms and compared with two-photon photoluminescence (TPL). We demonstrate that the corresponding 2D maps obtained by scanning the sample are partially uncorrelated due to the specific nature of the second order nonlinear sources. Hence, the TPL maps, which have been widely used to image the electric field distribution in plasmonic nanostructures, cannot be directly invoked in order to anticipate the efficiency and localization of the SHG response.
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11:35 : Design of a high performance optical tweezer for nanoparticle trapping

D. Conteduca (1),F. Dell'Olio (1),T. F. Krauss (2),Caterina Ciminelli (1),M. N. Armenise (1)

(1)Politecnico di Bari (Italy) , (2)University of York (United Kingdom)

The design of high performance optical nanotweezers based on a photonic/plasmonic microcavity has been carried out. High optical forces at pN-range with low input optical power (1mW) have been obtained, due to strong light-matter interaction in the cavity. The device is particularly suitable in biology and medicine because it enables the trapping of virus or single proteins.
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11:50 : Magneto-Optical Response of Periodically Nano-Structured Metal-Dielectric Films

Yakov M. Strelniker (1),David J. Bergman (2)

(1)Bar-Ilan University (Israel) , (2)Tel Aviv University (Israel)

The rotation and ellipticity of polarization of the light propagating through a metamaterial film with periodic nanostructure for arbitrary direction of the applied static magnetic field is studied. In the Voigt configuration the strong dependencies of the above mentioned effects on the direction of the applied field are found.
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12:05 Invited talk : Milling of antenna patterns with Au and Si ions

G. Seniutinas (1),A. Balcytis (1),Y. Nishijima (2),Saulius Juodkazis (1)

(1)Swinburne University of Technology (Australia) , (2)Yokohama National University (Japan)

Focused ion beam milling with Au+, Au2+, Si+, Si2+ ion species has been carried out on Au sputtered films to define arrays of square and rectangular nanoparticles with strong extinction at around 800 nm wavelength. Si2+ ions were also used to define nanogaps for THz photoconductive switch avoiding an electrical short between nano-contacts. Performance of the fabricated patterns is compared with those milled with Ga+.
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12:25 : Band gaps induced by vacuum photons in closed semiconductor cavities

Oleg Kibis (1),Kristin Bjorg Arnardottir (2),Ivan Shelykh (2)

(1)Novosibirsk State Technical University (Russia) , (2)University of Iceland (Iceland)

We consider theoretically a closed (zero-dimensional) semiconductor microcavity where a confined vacuum photonic mode is coupled to electrons in the valence band of the semiconductor. It is shown that vacuum-induced virtual electron transitions between valence and conduction bands result in renormalization of electron energy spectrum. As a consequence, vacuum-induced band gaps appear within the valence band. Calculated values of the band gaps are of sub-meV scale, which makes this QED effect measurable in state-of-the-art experiments.
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