Stochastic resonance in graphene bilayer optical nanoreceivers

Name: Stochastic resonance in graphene bilayer optical nanoreceivers
Author: Kocaoglu, M., Gülbahar, Burhan, Akan, O. B.

İsim	Stochastic resonance in graphene bilayer optical nanoreceivers
Yazar	Kocaoglu, M., Gülbahar, Burhan, Akan, O. B.
Basım Tarihi:	2014-11
Basım Yeri	- IEEE
Konu	Bilayer graphene, Graphene photodetector, Mutual information, Stochastic resonance (SR)
Tür	Süreli Yayın
Dil	İngilizce
Dijital	Evet
Yazma	Hayır
Kütüphane:	Özyeğin Üniversitesi
Demirbaş Numarası	1536-125X
Kayıt Numarası	dfe7dfcb-4c6d-48d6-b846-6dd746c5b45e
Lokasyon	Electrical & Electronics Engineering
Tarih	2014-11
Notlar	Due to copyright restrictions, the access to the full text of this article is only available via subscription.
Örnek Metin	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.
DOI	10.1109/TNANO.2014.2339294

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Stochastic resonance in graphene bilayer optical nanoreceivers

Yazar Kocaoglu, M., Gülbahar, Burhan, Akan, O. B.

Basım Tarihi 2014-11

Basım Yeri - IEEE

Konu Bilayer graphene, Graphene photodetector, Mutual information, Stochastic resonance (SR)

Tür Süreli Yayın

Dil İngilizce

Dijital Evet

Yazma Hayır

Kütüphane Özyeğin Üniversitesi

Demirbaş Numarası 1536-125X

Kayıt Numarası dfe7dfcb-4c6d-48d6-b846-6dd746c5b45e

Lokasyon Electrical & Electronics Engineering

Tarih 2014-11

Notlar Due to copyright restrictions, the access to the full text of this article is only available via subscription.

Örnek Metin 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.

DOI 10.1109/TNANO.2014.2339294