Optical bistability and multistability in a four-level quantum system in the presence of plasmonic nanostructure |
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| Institution: | 1. Physics Department, College of Sciences, Shiraz University, Shiraz 71454, Iran;2. Faculty of Advanced Technologies, Shiraz University, Shiraz, Iran;1. Kobe Advanced ICT Research Institute, National Institute of Information and Communications Technology, 588-2 Iwaoka, Kobe, Hyogo 651-2492, Japan;2. Department of Physics, Kyushu University, Hakozaki, Fukuoka 812-8581, Japan;3. Surface Physics and Structure Unit, National Institute for Materials Science, 3-13 Sakura, Tsukuba 305-0003, Japan;1. Graduate School of Information Science and Electrical Engineering, Kyushu University, 744 Motooka, Fukuoka 819-0395, Japan;2. Department of Information Electronics, Fukuoka Institute of Technology, 3-30-1 Wajiro-higashi, Higashi-ku, Fukuoka 811-0295, Japan;3. Department of Physics, Kyushu University, 6-10-1 Hakozaki, Fukuoka 812-8581, Japan;4. Research Center for Quantum Nano-Spin Sciences, Kyushu University, 6-10-1 Hakozaki, Fukuoka 812-8581, Japan |
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| Abstract: | In this paper, the effect of plasmonic nanostructure on behavior of optical bistability and multistability in a four-level quantum system embedded in a unidirectional ring cavity has been studied. It is found that the distance between plasmonic nanostructures and a four-level quantum system is varied from 4.4 nm to 14.4 nm and has an essential role for controlling the threshold of optical bistability and multistability. Moreover, obtained results show that the group velocity of pulse propagation through the medium is strongly depended on the distance between the plasmonic nanostructure and the four-level quantum system. |
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| Keywords: | Optical bistability Slow light propagation Plasmonic nanostructure |
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