Special Section on Nanostructured Thin Films: Fabrication, Characterization, and Application

Nonlinear optical theory and figure of merit of surface plasmon resonance of gold nanorods

[+] Author Affiliations
Jui-Teng Lin

National Taiwan University, Institute of Photonic and Optoelectronics, Taipei, Taiwan 10617

J. Nanophoton. 5(1), 051506 (March 04, 2011). doi:10.1117/1.3543815
History: Received September 23, 2010; Revised November 23, 2010; Accepted November 24, 2010; Published March 04, 2011; Online March 04, 2011
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A nonlinear theory for the optical properties of gold nanorods at various aspect ratios is used to calculate the refractive index sensitivity of surface plasmon resonance (M) which is found to be 100 to 1000 nm/RIU and proportional to the aspect ratio (R). Based on Gans theory, the calculated figure of merit, defined by the ratio of M and the resonance spectral width, has a range of 1.0 to 10 and has a maximum value at the optimum aspect ratio of 3.5 to 4.5. Numerical results are fit for analytic equations for the peak wavelength and sensitivity showing their nonlinear dependence on the surrounding medium refractive index (n) and R. The calculated optimal condition for the figure of merit provides useful guideline for the design of biosensors.

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© 2011 Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation

Jui-Teng Lin
"Nonlinear optical theory and figure of merit of surface plasmon resonance of gold nanorods", J. Nanophoton. 5(1), 051506 (March 04, 2011). ; http://dx.doi.org/10.1117/1.3543815


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