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Nanophotonics, plasmonics and quantum optics
10:10 Invited talk: Quantum dynamics in structured photonic fields
Jonas Wätzel, Jamal Berakdar
Martin-Luther-Universität Halle-Wittenberg (Germany)
Phase- and polarization-textured laser pulses have been realized in a wide range of frequencies spanning the XUV to the THz regimes. This contribution presents few examples on how to use these pulses or combination thereof to induce new types of optical quantum transitions and/or laser-dressed states. For instance, it is found that electronic toroidal states can be triggered and controlled on the picosecond time scale using polarization-structured THz vector beams.
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10:30 Invited talk: Light induced exotic chiral surface reliefs in azo-polymers
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Takashige Omatsu
Chiba University (Japan)
We review the formation of exotic chiral surface reliefs of azo-polymers by irradiation of structured light beams with optical angular momentum, that is orbital and spin angular momentum. Such chiral surface relief will be applied to be advanced chiral metasurfaces.
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Archak Purkayastha (1), Manas Kulkarni (2), Yogesh Joglekar (3)
(1)Trinity College Dublin (Ireland) , (2)Tata Institute of Fundamental Research (India) , (3)Indiana University Purdue University Indianapolis (IUPUI) (USA)
Open classical and quantum systems with effective parity-time (PT) symmetry have shown tremendous promise foradvances in lasers, sensing, and non-reciprocal devices.However, the microscopic origin of such effective, non-Hermitian models is not well under-stood. In this work, bymicroscopically modelling a double-quantum-dot-circuit-QED set-up that is realizable in state-of-the-art experi-ments, we show that a non-Hermitian Hamiltonian emergesnaturally, which can be controllably tuned to observe bothPT -transition, as well as the effect of quantum fluctuations.
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Taiichi Otsuji
Tohoku University (Japan)
We present new ideas on the operating principle and device structure of graphene plasmonic laser transistors based on controlling the PT symmetry of graphene Dirac plasmons with high radiation intensity and ultrafast modulation capability operating at room temperature in the THz frequency band.
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Jun Shibayama, Arata Yamamoto, Junji Yamauchi, Hisamatsu Nakano
Hosei University (Japan)
We investigate a waveguide-based polarization splitter in the terahertz (THz) region, in which a hybrid plasmonic waveguide and a dielectric waveguide are placed in parallel. The eigenmode analysis of each waveguide shows that the phase matching condition is satisfied for the quasi-TE mode and not for the quasi-TM mode, leading to a TM-pass polarizer. The device length is also predicted with the analysis of the supermode of the parallel waveguide.
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Alessandro Alabastri
Rice University (USA)
I will show how this phenomenon leads to a space-dependent out-of-equilibrium hot carrier population that breaks the optical symmetry of otherwise symmetrical nanostructures. The resulting asymmetric hot-carrier time dynamics can be exploited to manipulate light-matter interaction in the ultrafast regime. Electron-phonon scattering eventually induces heating, and I will show how properly designed large scale ultrathin (~250nm) metasurfaces allow extremely large (~GW/m3) and broadband (~90% of solar spectrum) dissipated power densities.
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Liam O'Faolain
Munster Technological University (Ireland)
We present results on a novel design of high Q-factor Silicon Nitride (SiN) 1D Photonic Crystal (PhC) cavities side-coupled to curved waveguides, operating with both silica and air cladding, which we then employ in a Hybrid External Cavity Laser (HECL) configuration. We demonstrate the operation of these lasers as novel transducers for refractive index changes that are induced by analyte specific absorption of infrared radiation by the target analytes present in gas or liquid phase.
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