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Optics Communications

Controlled optical switching based on dipole-induced transparency in a cavity–waveguide system

Wen-Xi Lai, LI Hong-cai, Rong‐Can Yang

Published Apr 4, 2008• 17 citations
Publisher
DOI
10.1016/j.optcom.2008.02.057

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Abstract We provide an approach to realize an optical switch using an induced transparency phenomenon in double-cavity structures. Our system consists of two directly coupled cavities, each coupled to a different waveguide. The system is pumped by a control field and a signal field propagating in the waveguides. We analyze the excitation spectra of the cavities, as well as corresponding transmission and reflection coefficients for the signal field. We find that induced transparency or an absorption phenomenon for the signal field can be established in this system, depending on the parameters of the control field. Thus, the transport properties for the signal field are highly controllable. Under appropriate parameters the system can behave as a nearly perfect optical switch for the signal field. The influence of dissipations on the efficiency of the switch is also discussed. The device studied here is suitable for on-chip integrations, and may have broad applications in future quantum networks.
In this work, we propose an all-optical controllable double state switch using the dipole induced transparency effect applied on multilevel nanocrystal doped to photonic crystal (PC) cavity. Using the proposed structure, with applying one control field the absorbing medium converted to transparent one and switching operation is obtained and then applying the second control field changes the transparent PC cavity to opaque one again. Analytical relation for the proposed switch is presented and studied by investigation of effects of parameters on switching characteristics.