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dc.contributor.authorKocaoglu, M.
dc.contributor.authorGülbahar, Burhan
dc.contributor.authorAkan, O. B.
dc.date.accessioned2016-06-30T12:33:32Z
dc.date.available2016-06-30T12:33:32Z
dc.date.issued2014-11
dc.identifier.issn1536-125X
dc.identifier.urihttp://hdl.handle.net/10679/4201
dc.identifier.urihttp://ieeexplore.ieee.org/xpl/articleDetails.jsp?reload=true&arnumber=6863684
dc.descriptionDue to copyright restrictions, the access to the full text of this article is only available via subscription.
dc.description.abstractGraphene, 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.
dc.language.isoengen_US
dc.publisherIEEE
dc.relation.ispartofIEEE Transactions on Nanotechnology
dc.rightsrestrictedAccess
dc.titleStochastic resonance in graphene bilayer optical nanoreceiversen_US
dc.typeArticleen_US
dc.peerreviewedyes
dc.publicationstatuspublisheden_US
dc.contributor.departmentÖzyeğin University
dc.contributor.authorID234525
dc.contributor.ozuauthorGülbahar, Burhan
dc.identifier.startpage1107
dc.identifier.endpage1117
dc.identifier.wosWOS:000345087900013
dc.identifier.doi10.1109/TNANO.2014.2339294
dc.subject.keywordsBilayer graphene
dc.subject.keywordsGraphene photodetector
dc.subject.keywordsMutual information
dc.subject.keywordsStochastic resonance (SR)
dc.identifier.scopusSCOPUS:2-s2.0-84910680742


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