Journal
OPTICS COMMUNICATIONS
Volume 314, Issue -, Pages 36-40Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optcom.2013.06.053
Keywords
Transient optical response; Double-V-type quantum system; Plasmonic nanostructure; Probe field; Absorption; Gain
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Funding
- European Union (European Social Fund-ESF)
- Operational Program Education and Lifelong Learning of the National Strategic Reference Framework (NSRF)-Research Funding Program: Heracleitus II. Investing in knowledge society through the European Social Fund
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We study theoretically the time evolution of the susceptibility of a four-level double-V-type quantum system near a plasmonic nanostructure. In the quantum system under study one V-type transition is influenced by the interaction with surface plasmons while the other V-type transition interacts with free-space vacuum. As a plasmonic nanostructure we consider a two-dimensional array of metal-coated dielectric nanospheres. We analyze the case of a linearly polarized weak laser field that couples the lowest state with the upper states in the free-space transitions. We show that the time evolution of the susceptibility of the system is strongly dependent on the distance between the quantum system and the plasmonic nanostructure. For example, while for some distances only transient absorption appears, for others transient gain Without inversion is possible. (C) 2013 Elsevier B.V. All rights reserved.
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