Nonlinear and Reconfigurable Plasmonics and Metamaterials I

10:30 Invited talk : Saturation in spasers with retardation: bistability, fields, cross-sections, quenching, boundary losses, and heating

Nikita Arnold (1),Klaus Piglmayer (1),Alexander Kildishev (2),Thomas Klar (1)

(1)Johannes Kepler University (Austria) , (2)Purdue University (USA)

Several spaser geometries are studied within electrodynamic framework in the generating and driven regimes. Gain is modelled using an inverted Lorentzian dielectric function with saturation broadening. The spasers with retardation and spatially inhomogeneous saturation are treated numerically, and the results are compared with the analytical guidelines. Quadrupolar modes of silver shells and dipolar modes of spheroids demonstrate thresholds close to the theoretical minimum. The role of quenching, boundary losses, and heating is also discussed.
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10:50 Invited talk : Self-action of Surface Plasmon Polaritons

Alexandre Baron, Thang B. Hoang, Chao Fang, Maiken H. Mikkelsen, David R. Smith

Duke University (USA)

We investigate theoretically and experimentally the nonlinear propagation of surface plasmon polaritons (SPP). Our observations reveal that the SPP undergoes strong ultrafast self-action through self-induced absorption, consistently with a large, third-order nonlinear susceptibility of gold and provide a self-consistent theory of self-action of SPPs at an air/metal interface. The implications for the nonlinear physics of plasmonics and metamaterials are important as they evidence that nonlinear absorption has a significant effect on the propagation of SPPs excited by intense pulses.
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11:10 Invited talk : Quantum Effects in Nanoantennas and Their Applications in Tunability, Mixing, and Rectification

Pai-Yen Chen (1),Mohamed Farhat (2)

(1)Wayne State University (USA) , (2)King Abdullah University of Science and Technology (Saudi Arabia)

We present here that by tailoring the geometry of nanoantennas and the electronic band structure, a nanoantenna, within the quantum mechanical realm, can induce linear and high-order quantum conductivities that are considerably enhanced by the surface plasmon resonance. We will present their nanophotonic applications including (i) modulatable and switchable radiators and metamaterials, (ii) optical rectification for detection and energy harvesting, and (iii) harmonic sensing for the physical properties of nanoparticle, e.g. DNA and molecules, loaded inside the nanogap.
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11:30 Invited talk : Nonlinear optics with polaritonic metasurfaces coupled to intersubband transitions

Jongwon Lee (1),Nishant Nookala (1),Mykhailo Tymchenko (1),Juan Gomez-Diaz (1),Frederic Demmerle (2),Gerhard Boehm (2),Markus-Christian Amann (2),Andrea Alu (1),Mikhail Belkin (1)

(1)University of Texas at Austin (USA) , (2)Technische Universitat Munchen (Germany)

We report highly-nonlinear metasurfaces based on combining electromagnetically-engineered plasmonic nanoresonators with quantum-engineered intersubband nonlinearities. Experimentally, effective nonlinear susceptibility over 480 nm/V was measured for second-harmonic generation at normal incidence.
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11:50 : Computational study of second-harmonic generation in diffraction gratings made of centrosymmetric materials using the nonlinear generalized source method

Martin Weismann (1),Dominic F.G. Gallagher (2),Nicolae C. Panoiu (1)

(1)University College London (United Kingdom) , (2)Photon Design Ltd (United Kingdom)

We present a new numerical method for the analysis of second-harmonic generation in diffraction gratings containing centrosymmetric materials. Our numerical method extends the generalized source method (GSM) and incorporates both the surface second harmonic (SH) polarization and the nonlocal bulk polarization into the algorithm to calculate the optical field at the SH. We study the convergence characteristics of the nonlinear GSM for plasmonic and dielectric gratings and investigate the contribution to the nonlinear response of surface and bulk polarization effects.
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12:05 : Three wave mixing in metamaterial based nonlinear photonic crystals

Shay Keren-Zur, Nadav Segal, Tal Ellenbogen

Tel Aviv University (Israel)

Nonlinear metamaterials open exciting possibilities for integrated nonlinear optics. We show how to obtain exceptional control of nonlinear optical interactions in metamaterials by constructing nonlinear metamaterial-based photonic crystals. These allow us to obtain engineered nonlinear diffraction, all-optical scanning, focusing and beam shaping of the nonlinear output. We also show that multilayered structures can boost the nonlinear conversion by orders of magnitude and extend the common analysis of second harmonic generation to arbitrary three wave mixing processes.
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12:20 : Tunable terahertz and microwave metamaterials based on pi-conjugated polymer actuators

Tatsunosuke Matsui (1),Yuto Inose (1),David A. Powell (2),Ilya V. Shadrivov (2)

(1)Mie University (Japan) , (2)Australian National University (Australia)

We demonstrate electro-active tuning of the resonant response of metamaterials utilizing pi-conjugated polymer actuators in terahertz (THz) and microwave frequency ranges. Linear actuators made from heavily doped polypyrrole film are utilized to change the relative lateral position of two THz metasurfaces with a control voltage, and accordion-shaped origami actuators are used to change the distance between two microwave split-ring resonators (SRRs). In both cases this results in significant tunability of the metamaterial resonances with a change of bias voltage.
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