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您的检索式：作者名="Paul M.Walker"
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| 1 | Nonlinear polaritons in a monolayer semiconductor coupled to optical bound states in the continuum显示文摘Optical bound states in the continuum(BICs)provide a way to engineer very narrow resonances in photonic crystals.The extended interaction time in these systems is particularly promising for the enhancement of nonlinear optical processes and the development of the next generation of active optical devices.However,the achievable interaction strength is limited by the purely photonic character of optical BICs.Here,we mix the optical BIC in a photonic crystal slab with excitons in the atomically thin semiconductor MoSe_(2) to form nonlinear exciton-polaritons with a Rabi splitting of 27 meV,exhibiting large interaction-induced spectral blueshifts.The asymptotic BIC-like suppression of polariton radiation into the far field toward the BIC wavevector,in combination with effective reduction of the excitonic disorder through motional narrowing,results in small polariton linewidths below 3 meV.Together with a strongly wavevector-dependent Q-factor,this provides for the enhancement and control of polariton–polariton interactions and the resulting nonlinear optical effects,paving the way toward tuneable BIC-based polaritonic devices for sensing,lasing,and nonlinear optics. | Vasily Kravtsov Ekaterina Khestanova Fedor A.Benimetskiy Tatiana Ivanova Anton K.Samusev Ivan S.Sinev Dmitry Pidgayko Alexey M.Mozharov Ivan S.Mukhin Maksim S.Lozhkin Yuri V.Kapitonov Andrey S.Brichkin Vladimir D.Kulakovskii Ivan A.Shelykh Alexander I.Tartakovskii Paul M.Walker Maurice S.Skolnick Dmitry N.Krizhanovskii Ivan V.Iorsh | 2020 | Light(Science & Applications)2020，9，1： | 1 |
| 2 | Observation of Zitterbewegung in photonic microcavities显示文摘We present and experimentally study the effects of the photonic spin–orbit coupling on the real space propagation of polariton wavepackets in planar semiconductor microcavities and polaritonic analogues of graphene.In particular,we demonstrate the appearance of an analogue Zitterbewegung effect,a term which translates as‘trembling motion’in English,which was originally proposed for relativistic Dirac electrons and consisted of the oscillations of the centre of mass of a wavepacket in the direction perpendicular to its propagation.For a planar microcavity,we observe regular Zitterbewegung oscillations whose amplitude and period depend on the wavevector of the polaritons.We then extend these results to a honeycomb lattice of coupled microcavity resonators.Compared to the planar cavity,such lattices are inherently more tuneable and versatile,allowing simulation of the Hamiltonians of a wide range of important physical systems.We observe an oscillation pattern related to the presence of the spin-split Dirac cones in the dispersion.In both cases,the experimentally observed oscillations are in good agreement with theoretical modelling and independently measured bandstructure parameters,providing strong evidence for the observation of Zitterbewegung. | Seth Lovett Paul M.Walker Alexey Osipov Alexey Yulin Pooja Uday Naik Charles E.Whittaker Ivan A.Shelykh Maurice S.Skolnick Dmitry N.Krizhanovskii | 2023 | Light(Science & Applications)2023，12，6： | 0 |
| 3 | Spatiotemporal continuum generation in polariton waveguides显示文摘We demonstrate the generation of a spatiotemporal optical continuum in a highly nonlinear exciton–polariton waveguide using extremely low excitation powers(2-ps,100-W peak power pulses)and a submillimeter device suitable for integrated optics applications.We observe contributions from several mechanisms over a range of powers and demonstrate that the strong light–matter coupling significantly modifies the physics involved in all of them.The experimental data are well understood in combination with theoretical modeling.The results are applicable to a wide range of systems with linear coupling between nonlinear oscillators and particularly to emerging polariton devices that incorporate materials,such as gallium nitride and transition metal dichalcogenide monolayers that exhibit large light–matter coupling at room temperature.These open the door to low-power experimental studies of spatiotemporal nonlinear optics in submillimeter waveguide devices. | Paul M.Walker Charles E.Whittaker Dmitry V.Skryabin Emiliano Cancellieri Ben Royall Maksym Sich Ian Farrer David A.Ritchie Maurice S.Skolnick Dmitry N.Krizhanovskii | 2019 | Light(Science & Applications)2019，8，1： | 0 |
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