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Optical coupling of surface plasmons between graphene sheets

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4 Author(s)
Bing Wang ; Institute of Materials Research and Engineering, Agency for Science, Technology and Research (A*STAR), 3 Research Link, Singapore 117602 ; Zhang, Xiang ; Yuan, Xiaocong ; Jinghua Teng

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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 × 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.

Published in:

Applied Physics Letters  (Volume:100 ,  Issue: 13 )

Date of Publication:

Mar 2012

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