1 School of Electrical Engineering&Information, Anhui University of Technology, Maanshan 243002, China; 2 School of Mathematics and Physics, Anhui University of Technology, Maanshan 243002, China; 3 Wuhan National High Magnetic Field Center and Department of Physics, Huazhong University of Science and Technology, Wuhan 430074, China
Abstract We investigate theoretically single photon transport in one-dimensional waveguide coupled to a pair of cavities, which are denoted by the first cavity and the auxiliary cavity. Two cases with no atom and one atom embedded in the first cavity are discussed. The Fano dips in the transmission spectrum and locations of transparency window are calculated. When no atom is embedded in the first cavity, there exists a transparency window under the condition that the first cavity and the auxiliary cavity are not resonant. The locations of the transparency window and Fano line type depend strongly on the eigen frequency of the auxiliary cavity and the coupling strength between the auxiliary cavity and the waveguide. When one atom is embedded in the first cavity, we show that the transparency window exists even though the first cavity, the atom and the auxiliary cavity are resonant. The Fano line type is strongly dependent on the eigen frequency of the auxiliary cavity and the coupling strength. Our results have potential applications in design of quantum devices at the level of single photon, such as single photon switch and single photon routers.
Yu-Xin Shu(树宇鑫), Xiao-San Ma(马小三), Xian-Shan Huang(黄仙山), Mu-Tian Cheng(程木田), and Jun-Bo Han(韩俊波) Fano interference and transparency in a waveguide-nanocavity hybrid system with an auxiliary cavity 2021 Chin. Phys. B 30 104204
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