PT-symmetry in photonics, metamaterials and plasmonic systems I

10:30 Keynote talk : PT symmetry and the taming of instabilities

Carl M. Bender

Washington University (USA)

Physically unacceptable theories that suffer from instabilities may be reinterpreted as PT-symmetric theories in the complex plane. The advantage of doing so is that in the complex plane these theories become stable and thus physically realistic.
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11:00 Invited talk : Bloch Oscillations in Lattices with local PT-symmetry

Nicholas Bender, Huanan Li, Tsampikos Kottos

Wesleyan University (USA)

We investigate a new type of Bloch Oscillations which are supported in lattices with local PT-symmetry. Interestingly enough we find that these lattices can be interpreted as the Floquet lattices describing periodically driven PT-symmetric dimers.
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11:20 : Parity-Time symmetric Plasmonic Materials and Metamaterials

H. Alaeian, J. A. Dionne

Stanford University (USA)

Parity-Time (PT) symmetric photonic structures are constructed with balanced amounts of gain and loss positioned in a geometrically symmetric layout. Here, we describe PT plasmonic materials and devices constructed from deeply subwavelength components. We investigate planar and coaxial plasmonic PT waveguides and metamaterials, exploring optical mode coalescence, unidirectional scattering, dipolar spontaneous emission control and optical enantiomer selection. Our results may enable new nanoscale PT materials and metamaterials that exhibit optical asymmetry and, with incorporation of nonlinearities, unidirectionality.
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11:35 Invited talk : Interaction of soliton with an exceptional point in a PT-symmetric coupler with a coupling defect

Yuliy Bludov (1),Chao Hang (2),Guoxiang Huang (2),Vladimir Konotop (3)

(1)Universidade do Minho (Portugal) , (2)East China Normal University (China) , (3)Universidade de Lisboa (Portugal)

We study interaction of a soliton in a parity-time symmetric coupler which has local perturbation of the coupling constant. Such a defect does not change the PT-symmetry of the system, but locally can achieve the exceptional point. We found several scenarios of the symmetric and antisymmetric soliton-defect interactions (transformation into breather, broadening, splitting, blowup). All the effects are preserved when the coupling strength in the center of the defect deviates from the exceptional point.
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11:55 : Evolution of energy conservative states in a non-uniform system of coupled waveguides with local parity-time symmetry

Anatole Lupu (1),Vladimir V. Konotop (2),Henri Benisty (1)

(1)Paris Sud University (France) , (2)Universidade de Lisboa (Portugal)

We address the problematic of energy conservative states in PT-symmetric system of coupled waveguides. It is demonstrated that energy conservative states satisfying requirements for a switching operation can be also obtained in PT-symmetric couplers with non-uniform coupling or gain-loss profiles. We also provide evidence for energy conservative states corresponding to polarization rotation. This opens new prospects for functional applications of PT-symmetric devices in photonics.
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12:10 Invited talk : Parity-Time Anti-Symmetric Parametric Amplifier

Diana Antonosyan, Alexander Solntsev, Andrey Sukhorukov

Australian National University (Australia)

We predict that directional coupler of quadratically nonlinear and lossy waveguides can perform ultrafast signal switching and parametric amplification, using the pump-controlled breaking of the parity-time anti-symmetry associated with nonlinear wave mixing.
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