DocumentCode :
108413
Title :
Stochastic Resonance in Graphene Bilayer Optical Nanoreceivers
Author :
Kocaoglu, Murat ; Gulbahar, Burhan ; Akan, Ozgur B.
Author_Institution :
Dept. of Electr. & Electron. Eng., Koc Univ., Istanbul, Turkey
Volume :
13
Issue :
6
fYear :
2014
fDate :
Nov. 2014
Firstpage :
1107
Lastpage :
1117
Abstract :
Graphene, a 2-D sheet of carbon atoms, is believed to have diverse application areas ranging from medicine to communications. A novel application is using graphene as a photodetector in optical communications due to its superior optical and electrical properties such as wide and tunable absorption frequency range and high electron mobility. Noise, which is especially significant in nanoscale communications, is mostly seen as an adversary. Stochastic resonance (SR) is the performance enhancement of a system due to incorporation of noise. It is shown that the excess noise in nanocommunications can be used to improve the performance of a graphene bilayer photodetector system with hard threshold decoder, when received signals are subthreshold. SR arises due to the nonlinear nature of the hard decoder. First, the SR effect due to the background ambient noise and intentional light noise is analyzed. An approximate inverse signal-to-noise ratio expression is derived, which maximizes the mutual information. The effect of frequency on the mutual information is also investigated, and it is shown that the higher frequencies are more preferable for noise limited regimes. Later, the case with the intentional noise added to the top gate is investigated. It is shown that significant mutual information improvements are achieved for subthreshold signals, due to the multiplicative stochastic terms arising from the nonlinear graphene bilayer characteristics, i.e., the exponential dependence of photocurrent on the gate voltages. All the analytical results are verified with extensive simulations.
Keywords :
electron mobility; graphene; nanophotonics; nonlinear optics; optical noise; optical receivers; optical tuning; photodetectors; stochastic processes; 2D carbon atom sheet; C; approximate inverse signal-to-noise ratio expression; background ambient noise; electrical properties; graphene bilayer optical nanoreceivers; graphene bilayer photodetector system; hard threshold decoder; high electron mobility; intentional light noise; multiplicative stochastic terms; mutual information maximization; nanocommunications; nonlinear optics; optical communications; photocurrent; stochastic resonance; tunable absorption frequency range; Graphene; Logic gates; Mutual information; Nanoscale devices; Noise; Photodetectors; Stochastic resonance; Bilayer graphene; graphene photodetector; mutual information; stochastic resonance (SR);
fLanguage :
English
Journal_Title :
Nanotechnology, IEEE Transactions on
Publisher :
ieee
ISSN :
1536-125X
Type :
jour
DOI :
10.1109/TNANO.2014.2339294
Filename :
6863684
Link To Document :
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