Local-field correction in the strong-coupling regime

Abstract

The influence of the local-field correction on the strong atom-field coupling regime are investigated using the real-cavity model. The atom is positioned at the center of a multilayer sphere. Three types of mirrors are considered: perfectly reflecting, Lorentz band gap, and Bragg-distributed ones, with special emphasis on experimental practicability. In particular, the influence of the local field on the spectral resonance lines, the Rabi oscillation frequency and decay rate, and the condition indicating the occurrence of the strong-coupling regime are studied in detail. It is shown that the local-field correction gives rise to a structureless plateau in the density of states of the electromagnetic field. The level of the plateau rises with increasing material density and/or absorption, which may eventually destroy the strong-coupling regime. The effect of the local field is especially pronounced at high-material densities due to direct energy transfer from the guest atom to the medium. At lower material density and/or absorption, variation of the material density does not seem to affect much the strong-coupling regime, except for a small shift in the resonance frequency.

Characterizing the Magnitude and Structure-Dependence of Free Charge Density Gradients in Room-Temperature Ionic Liquids

“…The size and shape of the ions and the absence of a dielectric solvent prevents organized ion packing, with both factors contributing to the materials existing in the liquid phase under ambient conditions. There is a substantial body of work extant focusing on the bulk physical properties of RTILs, including efforts aimed at understanding the role of hydrogen bonding in mediating mobility, characterizing mass and charge transport, − determining dissociation, − dielectric response, − and issues associated with local and long-range electrostatic interactions. − RTILs hold promise for a variety of practical applications, including use as solvents for chemical separations , and syntheses, , as electrolytes for supercapacitors − and fuel cells, , and potentially as novel electro-optic materials . Despite the wide range of applications for RTILs, there remain many fundamental issues to be resolved, especially with regard to fluidity and ion dynamics, and with understanding the organization and response of these materials when subjected to external forces.…”

Spontaneous decay rate and Casimir–Polder interaction of a two-level atom in a Bragg-reflector cylindrical structure

“…The spontaneous decay rate of an excited atom inside a defect Bragg-distributed mirror was studied in [23], which showed that the basic resonance appears at the half-wavelength thickness of the central layer. Other works dealt with the spontaneous emission in onedimensional photonic crystal [24], a multi-layer dielectric sphere [25], the generation of single photons by atomic emission in a multilayer microsphere [26], local field correction in spherical structures [27], and near-infrared spectra of emission reflected from a spherical distributed Bragg reflector [28].…”

Sự Ảnh Hưởng Của Bổ Chính Trường Định Xứ Lên Cơ Chế Tương Tác Mạnh

“…Mật độ trạng thái của trường tại một cộng hưởng đặc trưng, buồng cộng hưởng dạng phân bố Bragg với vật chất bao quanh có hệ số điện môi   cho bởi biểu thức(14).Các thamsố khác như trong hình 2.Có thể thấy rằng một trong những tác dụng của trường định xứ là làm tăng mật độ trạng thái của trường tương ứng với một thừa số r , trong biểu thức(13). Trong đó  R BG r ,r , như đã nói ở trên, là thành phần tán xạ của hàm Green trong tình huống không có hốc.…”