Negative group velocity of surface plasmons on thin metallic films
Liu, Yongmin, Pile, David F., Liu, Zhaowei, Wu, Dongmin, Sun, Cheng, & Zhang, Xiang (2006) Negative group velocity of surface plasmons on thin metallic films. In The International Society for Optical Engineering (SPIE) 2006: Plasmonics: Metallic Nanostructures and their Optical Properties IV, The International Society for Optical Engineering (SPIE), 63231M.
By tailoring the dispersion curve of surface plasmons (SPs) of a thin metallic film surrounded by dielectric half-spaces, it is shown that the group velocity of the symmetric mode is always positive, while the group velocity of the anti-symmetric mode can be negative. Consequently, the forward and backward propagation of SPs, in which the energy flow is respectively parallel or antiparallel to the wave vector, can be realized. The physical origin of the intriguing backward SPs is given. Furthermore, schemes for the negative refraction and imaging of SPs are proposed by incorporating two plasmon modes with group velocities of opposite signs.
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|Item Type:||Conference Paper|
|Keywords:||thin film, surface plasmon, negative group velocity, negative refraction|
|Subjects:||Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000) > OPTICAL PHYSICS (020500)|
|Divisions:||Past > QUT Faculties & Divisions > Faculty of Science and Technology|
|Copyright Owner:||Copyright 2006 SPIE|
|Copyright Statement:||Reproduced in accordance with the copyright policy of the publisher.|
|Deposited On:||16 Oct 2006 00:00|
|Last Modified:||09 Jun 2010 12:34|
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