Journal
APPLIED PHYSICS LETTERS
Volume 100, Issue 13, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3698133
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Funding
- A*STAR SERC [0921450030, 0921540099, 0921540098]
- Ministry of Science and Technology of China [2009DFA52300]
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In this letter, we theoretically investigate the coupling of far-infrared surface plasmon polaritons (SPPs) between spatially separated graphene sheets. By using the finite-difference frequency-domain method, we numerically illustrate the SPP propagation and modulation in the graphene sheets. The coupling of SPPs is employed to design zero insertion loss optical splitters, 1 x 2 digital optical spatial switches, and ultra-compact Mach-Zehnder interferometers with the arm length far below the diffraction limit. The study provides an effective way in designing graphene based high-speed and ultra-compact optoelectronic devices. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.3698133]
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