The Effect Of Coherent Coupling Between Super-subradiant States On The Radiative Properties Of Diatomic Systems

Diatomic systems trapped in the space scale of subradiative wavelengths can produce superradiative and subradiative effects,so they become the main entry point to study the quantum properties of multiatomic sets of radiation.For example,electromagnetic-like induced transparency mechanisms have recently been constructed by coupling superradiation and subradiation between two atoms.On the other hand,with the continuous development of nanomaterial technology in recent years,the precise manipulation of spatial radiation patterns and directional radiation properties at the spatial scale of subradiation wavelengths has become an important research topic in micro-nano photonics and quantum optics.In this paper,the spatial and spectral properties of the aggregate radiation generated by a diatomic system selectively driven by an external laser field are studied.We first introduce two arrays of laser beams propagating in opposite directions to explore the influence of the coherent coupling between the superradiative and subradiative states of the diatomic system on the radiation and absorption spectra generated by the diatomic system driven by weak and strong fields,respectively.Under the weak field drive,we calculate the absorption spectrum based on the condition of electromagnetically induced transparency,and analyze the effects of the distance between the two atoms and the coupling of the atom and the driving field on the absorption spectrum.In addition,the precise measurement of the distance between the two peaks in the experiment provides the possibility for the precise quantum measurement in the spatial scale of the subradiation wavelength.The resonance fluorescence spectra generated by the superradiation transition are investigated under the strong field drive,and the dependence of the resonance fluorescence spectrum on the distance between the two atoms and the coherence between the atom and the field is analyzed under the decorated state representation.We also investigate the spatial orientation of the lumped stimulated radiation generated by a diatomic system selectively driven by a weak laser field.By investigating the spatial angular distribution of radiation intensity,it is found that the radiation intensity is strongly dependent on the atomic coherence effect between superirradiated states and subirradiated states,and shows significant spatial asymmetry.We show that this property results from the interference between the electric dipole moments of symmetrical superposition and those of antisymmetric superposition.In the study of the two-photon correlation properties of the diatomic aggregate radiation,we have realized the remarkable space-directed superbunching effect.Based on this property,the diatomic system provides the potential for constructing unidirectional or bidirectional nantennas.Finally,we summarize and look forward to the full text.