Special Section on Nanobiophotonics and Related Techniques

Optical determination of thick graphene layer number based on surface plasmon resonance

[+] Author Affiliations
Sherif H. El-Gohary

Kyung Hee University, Department of Biomedical Engineering, Yongin 446-701, Republic of Korea

Nak-Hyeon Kim

Kyung Hee University, Department of Biomedical Engineering, Yongin 446-701, Republic of Korea

Kyung Min Byun

Kyung Hee University, Department of Biomedical Engineering, Yongin 446-701, Republic of Korea

J. Nanophoton. 7(1), 073799 (Aug 30, 2013). doi:10.1117/1.JNP.7.073799
History: Received June 4, 2013; Revised August 2, 2013; Accepted August 7, 2013
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Abstract.  An optical method of measuring the number of layers in a graphene sample is formulated and compared with the conventional surface plasmon resonance (SPR) detection scheme, the latter being appropriate only for a very few graphene layers. Numerical results based on transfer-matrix method support that an alternative method, wherein the SPR substrate includes a dielectric overlayer, is feasible over a wide range of graphene layer numbers. While the multilayer graphene may lead to a broad and shallow SPR curve owing to the nonzero imaginary part in its relative permittivity, the dielectric overlayer makes the resonant surface plasmons less affected by graphene, resulting in a strong and deep absorption band at resonance. Linear regression analysis shows that the measurable graphene layer number can be as high as 50.

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© 2013 Society of Photo-Optical Instrumentation Engineers

Citation

Sherif H. El-Gohary ; Nak-Hyeon Kim and Kyung Min Byun
"Optical determination of thick graphene layer number based on surface plasmon resonance", J. Nanophoton. 7(1), 073799 (Aug 30, 2013). ; http://dx.doi.org/10.1117/1.JNP.7.073799


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