Plasmonic EIT-like switching in bright-dark-bright plasmon resonators

Department of Physics, Anhui Key Laboratory of Optoelectronic Science and Technology, University of Science and Technology of China, Hefei, Anhui, China.
Optics Express (Impact Factor: 3.49). 03/2011; 19(7):5970-8. DOI: 10.1364/OE.19.005970
Source: PubMed


In this paper we report the study of the electromagnetically induced transparency (EIT)-like transmission in the bright-dark-bright plasmon resonators. It is demonstrated that the interferences between the dark plasmons excited by two bright plasmon resonators can be controlled by the incident light polarization. The constructive interference strengthens the coupling between the bright and dark resonators, leading to a more prominent EIT-like transparency window of the metamaterial. In contrary, destructive interference suppresses the coupling between the bright and dark resonators, destroying the interference pathway that forms the EIT-like transmission. Based on this observation, the plasmonic EIT switching can be realized by changing the polarization of incident light. This phenomenon may find applications in optical switching and plasmon-based information processing.

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    • "Although EIT was originally conceived as a quantum phenomenon that occurs through destructive interference between two radiative transitions amongst three electron energy levels202122, the EIT phenomena can be mimicked with two coupled resonators23 because EIT is essentially a wave phenomenon. Many demonstrations for realizing EIT-like phenomena were reported with metamaterial (metasurface) structures using microwaves2425262728293031, THz waves3233343536373839404142434445, and in the near infrared region46474849505152535455. Very recently, the optical modulation of the EIT spectrum was demonstrated experimentally in the THz region56. "
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