Abstract In this paper, the probe absorption spectrum of an atom in a double-band photonic crystal have been studied. In the modes, we assume that one of the two atomic transitions in a $\Lambda$-type atomic system is interacting with free vacuum modes, and another transition is interacting with free vacuum modes, isotropic photonic band gap (PBG) modes and anisotropic PBG modes, separately. The effects of the fine structure of the atomic lower levels on the probe absorption spectrum are investigated in detail in the three cases. The most interesting thing is that the two (four) transparencies at one (two) probe absorption peak(s), caused by the fine structure of the lower levels of an atom, are predicted in the case of isotropic PBG modes.
Received: 12 March 2004
Revised: 24 May 2004
Accepted manuscript online:
Fund: Project supported by the Scientific Research Foundation for the Returned Chinese Scholars, State Education Ministry, China.
Cite this article:
Wen Qing-Bo (温庆波), Wang Jian (王健), Zhang Han-Zhuang (张汉壮) Probe spectrum of a four-level atom in a double-band photonic crystal 2004 Chinese Physics 13 1407
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