- 标题
- 摘要
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- 实验方案
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Ultrafast Response of a Hybrid Device Based on Strongly Coupled Monolayer WS <sub/>2</sub> and Photonic Crystals: The Effect of Photoinduced Coulombic Screening
摘要： Quantum interactions between transition metal dichalcogenides (TMDs) and optical cavities are rapidly becoming an appealing research topic since these interactions underly a broad spectrum of optical phenomena. Here, we fabricate a simple device in which coherent strong coupling interactions occur between a photonic crystal (PhC) slab and monolayer tungsten disulfide (WS2). Both steady-state angle-resolved spectroscopy and transient absorption microscopy (TAM) are employed to explore the coupling behavior of this device. Specifically, anticrossing dispersions are observed in the hybrid device, indicating a Rabi splitting of 40.2 meV. A newly formed spectral feature emerges in the transient absorption (TA) spectrum of this polariton device under near-resonant excitation, which is subsequently evidenced to be a signature of the upper hybrid exciton–polariton state. Moreover, by carefully analyzing the ultrafast responses of both bare WS2 and the WS2-PhC polariton device excited both off resonance and near resonance, it is found that nonequilibrium thermal decay induces Coulombic screening in the monolayer WS2, which has a major impact on the formation of exciton–polariton. The results of this work could not only improve the current understanding of photophysics in the strong light–matter coupling regime but also lay the foundation for tailoring the development of TMD-based coherent devices.
关键词： strong coupling,transition metal dichalcogenides,photonic crystals,Rabi splitting,transient absorption microscopy,Coulombic screening
更新于2025-09-16 10:30:52
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[IEEE 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Paris, France (2019.9.1-2019.9.6)] 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Ultrastrong coupling of plasmonic metamaterials and photons in a terahertz photonic crystal cavity
摘要： Light-matter interaction in the strong coupling regime is of profound interest for fundamental quantum optics and applications. Here, we report a new type of strong light-matter interaction of metamaterial ‘quasi-particles’ with photons in a photonic crystal cavity in the terahertz frequency range. The measured Rabi splitting shows a square-root dependence on the density of metamaterial unit cells, even for unit cells from two spatially separated planar metamaterials, indicating nonlocal collective strong interactions. These findings are of interest for the investigation of fundamental strong-coupling phenomena, but also for applications such as ultra-low-threshold terahertz polariton lasing, voltage-controlled modulators and frequency filters, and ultra-sensitive chemical and biological sensing.
关键词： strong coupling,light-matter interaction,metamaterial,nonlocal collective strong interactions,terahertz,Rabi splitting,photonic crystal cavity
更新于2025-09-12 10:27:22
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Double Rabi Splitting in a Strongly Coupled System of Core-Shell Au@Ag Nanorods and J-Aggregates of Multiple Fluorophores
摘要： The interaction of several components in the strong coupling regime yielding multiple Rabi splittings opens up remarkable possibilities for studies of multimode hybridization and energy transfer, which is of considerable interest in both fundamental and applied science. Here we demonstrate that three different components such as core-shell Au@Ag nanorods and J-aggregates of two different dyes, can be integrated into a single hybrid structure, which leads to strong collective exciton-plasmon coupling and double-mode Rabi splitting totaling 338 meV. We demonstrate strong coupling in these multicomponent plexitonic nanostructures by means of magnetic circular dichroism spectroscopy, and demonstrate strong magneto-optical activity for the three hybridized states resulting from this coupling. The J-aggregates of two different non-magnetic dyes interact with metal nanoparticles effectively, achieving magnetic properties due to the hybridization of electronic excitations in the three-component system.
关键词： magnetic circular dichroism,double Rabi splitting,J-aggregates,plexciton,Strong coupling,magneto-optical activity
更新于2025-09-12 10:27:22
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[IEEE 2018 12th International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials) - Espoo, Finland (2018.8.27-2018.9.1)] 2018 12th International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials) - Strong coupling and non-reciprocity in the dynamics of a V-atom placed near an anisotropic metasurface
摘要： In this work we focus on studying the temporal dynamics of a V-type quantum emitter with two excited states, which allows to observe an interplay between different spontaneous emission channels. We show that the presence of an anisotropic metasurface enables an interaction between the two active transitions and makes it possible to achieve a strong coupling regime. We also show that if the rotation plane of the transition dipole moments is arbitrarily oriented with respect to the metasurface interface, it is possible to observe a non-reciprocal behavior.
关键词： spontaneous emission,non-reciprocity,strong coupling,anisotropic metasurface,quantum emitter
更新于2025-09-10 09:29:36
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Manipulating azobenzene photoisomerization through strong light–molecule coupling
摘要： The formation of hybrid light–molecule states (polaritons) offers a new strategy to manipulate the photochemistry of molecules. To fully exploit its potential, one needs to build a toolbox of polaritonic phenomenologies that supplement those of standard photochemistry. By means of a state-of-the-art computational photochemistry approach extended to the strong-coupling regime, here we disclose various mechanisms peculiar of polaritonic chemistry: coherent population oscillations between polaritons, quenching by trapping in dead-end polaritonic states and the alteration of the photochemical reaction pathway and quantum yields. We focus on azobenzene photoisomerization, that encompasses the essential features of complex photochemical reactions such as the presence of conical intersections and reaction coordinates involving multiple internal modes. In the strong coupling regime, a polaritonic conical intersection arises and we characterize its role in the photochemical process. Our chemically detailed simulations provide a framework to rationalize how the strong coupling impacts the photochemistry of realistic molecules.
关键词： azobenzene,photochemistry,polaritons,photoisomerization,strong coupling
更新于2025-09-10 09:29:36
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Strong Coupling in Microcavity Structures: Principle, Design, and Practical Application
摘要： When interaction between light and matter is in the strong coupling region, matter has a significant influence on the whole system, with potential to develop low-power active optical devices. Strong coupling can verify some basic problems of quantum physics, and it is an ideal system to study light–matter interaction, providing an intuitive and accurate demonstration of some pure quantum effects with small mass and easy optical control. Here, the most important advances in strong coupling in recent years are described. Of late, an extensive series of experimental and theoretical findings, and remarkable achievements have been made in this field. Strong coupling between cavities and some new materials such as semiconductors, two-dimensional (2D) material, and quantum dots (QDs) are the focus of research in this field. Another field that has made outstanding progress is the application of this optical phenomenon, including resonance-enhanced Raman and infrared spectra, nanolasers, and cavity-enhanced sensing. Furthermore, the potential in this field arises for future quantum information and quantum optical devices. It is now developing at a very fast rate and can be predicted to have broad prospects for development in the future. Some prospects in terms of design and application are included.
关键词： strong coupling,vacuum Rabi splitting,optical devices,quantum optics
更新于2025-09-10 09:29:36
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Normal mode splitting in quantum degenerate Fermi gas in nano-cavity
摘要： We report the normal mode splitting in the fermionic displacement spectrum as a single mode light field interacts with a mechanical mode of ultra-cold quantum degenerate Fermi gas trapped inside a Fabry–Pérot cavity in the strong coupling regime. We explain the normal mode splitting in the outgoing field of the cavity field and in the field quadratures as well. As a function of system parameters, such as coupling strength between fermionic mode and field mode, number of fermionic atoms, cavity decay rate and fluctuations associated with the fermionic mode we explain the phenomenon of normal mode splitting. The low-lying fermions ensemble displays a collective density oscillation associated with particle-hole excitations, which interacts with cavity light field and lead to the observation of NMS in the fermion quadratures and light modes. The numerical results based on the present day laboratory experiments agree with the obtained analytical results.
关键词： Fabry–Pérot cavity,quantum degenerate Fermi gas,Normal mode splitting,fermionic displacement spectrum,strong coupling regime
更新于2025-09-09 09:28:46
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Strong coupling of a two-dimensional electron ensemble to a single-mode cavity resonator
摘要： We investigate the regime of strong coupling of an ensemble of two-dimensional electrons to a single-mode cavity resonator. In particular, we realize such a regime of light-matter interaction by coupling the cyclotron motion of a collection of electrons on the surface of liquid helium to the microwave field in a semiconfocal Fabry-Pérot resonator. For the corotating component of the microwave field, the strong coupling is pronouncedly manifested by the normal-mode splitting in the spectrum of coupled field-particle motion. We present a complete description of this phenomenon based on classical electrodynamics, as well as show that the full quantum treatment of this problem results in mean-value equations of motion that are equivalent to our classical result. For the counterrotating component of the microwave field, we observe a strong resonance when the microwave frequency is close to both the cyclotron and cavity frequencies. We show that this surprising effect, which is not expected to occur under the rotating-wave approximation, results from the mixing between two polarization components of the microwave field in our cavity.
关键词： microwave field,classical electrodynamics,cavity resonator,normal-mode splitting,two-dimensional electrons,rotating-wave approximation,Fabry-Pérot resonator,strong coupling,quantum treatment,cyclotron motion
更新于2025-09-04 15:30:14