We study the scattering of a single photon in the SPP mode by an atom in the regime where the photon wavelength becomes comparable to the atomic size. The spectral signatures are tunable and significantly differ from the usual Lorentzian response.
We study the interaction of a single photon in a surface plasmon polariton mode with multiple atoms. We propose a system of two atoms to achieve a tunable scattering from subscattering to superscattering regimes by changing the angle of the incident photon. We also demonstrate a perfect electromagnetically-induced transparency using two atoms with two-level structures. The proposed framework is efficiently scalable to a system with a large number of atoms and opens up the possibility of designing novel atom-based optical devices. We design an atomically thin parabolic mirror to focus single photons and form a quantum mirage in a cavity built from atoms.
We study the polaritonic bandstructure of a two-dimensional (2D) atomic lattice coupled to a surface plasmon polariton mode in the single excitation regime. We adopt a Dirichlet-to-Neumann map based computational technique which can accurately model non-Markovian dynamics as well as narrow-bandwidth features associated with any periodic atom-photon system in general. Using this technique, we design a 2D atomic lattice using only two-level atoms, which has an isolated flat polaritonic band where the magnitude of the group velocity for the modes in the band approach zero across the whole Brillouin zone. Such a system could be employed to slow, store, and manipulate single photons in a 2D geometry.
Abstract We study the interaction of a single photon in a surface plasmon polariton mode with multiple atoms. We propose a system of two atoms to achieve a tunable scattering from subscattering to superscattering regimes by changing the angle of the incident photon. We also demonstrate a perfect electromagnetically‐induced transparency using two atoms with two‐level structures. The proposed framework is efficiently scalable to a system with a large number of atoms and opens up the possibility of designing novel atom‐based optical devices. We design an atomically thin parabolic mirror to focus single photons and form a quantum mirage in a cavity built from atoms.
Abstract In a four-level atomic configuration, we suggest a theoretical framework that is capable of obtaining sub-wavelength atomic localization by utilizing surface plasmon polaritons (SPPs). Via quantum interference mechanisms, we exhibit precise atomic positioning by utilizing the strong electromagnetic field confinement and enhanced near field interactions inherent to (SPPs). Our model employs specialized probe and control fields to generate spatially dependent absorption, thereby facilitating atomic localization with nanometer scale precision. We have identified sharply defined localization patterns that are regulated by phase modulation and detuning parameters through comprehensive numerical simulations. The conventional diffraction limit is effectively overcome by the coupling between (SPP) modes and atomic states, while quantum coherence is maintained. These findings provide practical implications for applications in plasmon enhanced spectroscopy, nanolithography, and atomic trapping, as they open new frontiers for quantum-scale manipulation. Additionally, we establish the optimal operational parameters that optimize spatial resolution and suppress decoherence in plasmonic nanostructures.
We develop a new scheme of two-dimensional (2D) and three-dimensional (3D) atom localization via absorption and gain spectra of surface plasmon polaritons (SPPs) in a closed loop four-level atomic system. For the atom–field interaction, we construct a spatially dependent field by superimposing two (three) standing-wave fields (SWFs) in 2D (3D) atom localization, respectively. We achieve high-precision and high spatial resolution of an atom localization by appropriately adjusting the system parameters such as probe field detuning and phase shifts of the SWFs. The absorption and gain spectra are used to attain information about the position of an atom in SPPs. Our proposed scheme opens up a fascinating way to improve the atom localization that supplies some practical applications in a high-dimensional SPPs.