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Plasmonic gain in long-range surface plasmon polariton waveguides bounded symmetrically by dye-doped polymer

Title
Plasmonic gain in long-range surface plasmon polariton waveguides bounded symmetrically by dye-doped polymer
Author
송석호
Keywords
AMPLIFIED SPONTANEOUS EMISSION; LASERS
Issue Date
2015-09
Publisher
AMER INST PHYSICS
Citation
APPLIED PHYSICS LETTERS, v. 107, NO 12, Page. 121107-121107
Abstract
The plasmonic gain of a top-pumped active symmetric metal slab waveguide is investigated theoretically and experimentally. The structure consists of a thin Ag film cladded above and below by gain media (IR140-doped poly (methyl methacrylate)), and operating with long-range surface plasmon polaritons (LRSPPs) at near-infrared wavelengths. We consider the spatial distribution of the pump intensity and the position dependence of the dipole lifetime within the claddings when computing the LRSPP gain. We find that the bottom cladding provides significant gain to the LRSPP, despite the low pump transmittance through the Ag film, as long as the pump intensity is strong enough to saturate the gain material (similar to 4MW/cm(2)). In this situation, the LRSPP gain is doubled compared to the case where the top cladding only is active. The LRSPP gain was measured in a fabricated structure using the variable stripe length method, yielding g(mod) = 16.7 cm(-1) at a pump intensity of similar to 4MW/cm(2). The measured LRSPP gain agrees very well with the computed value, implying that the bottom cladding provides significant gain to the mode. Active plasmonic devices based on the symmetric dielectric-metal-dielectric structure can be significantly more efficient by using gain layers as both the top and bottom claddings. (C) 2015 AIP Publishing LLC.
URI
http://aip.scitation.org/doi/abs/10.1063/1.4931699http://hdl.handle.net/20.500.11754/27415
ISSN
0003-6951; 1077-3118
DOI
10.1063/1.4931699
Appears in Collections:
COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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