Abstract
Numerical methods are very important for designing nanodevices since localized surface plasmon resonance is sensitive to the geometric parameters. Especially, as for nano-biosensor, the proper choice of design tool is very critical in terms of the accuracy and simulation time. In this paper, we compare the discrete dipole approximation (DDA) with the finite integration technique (FIT) of the full-wave electromagnetic commercial software (CST Microwave Studio) in worldwide use with popularity. The refractive index sensitivity of rhombic hybrid Au–Ag nanostructures is calculated and compared in visible wavelength using DDA and FIT. Comparing the calculated results, the DDA has two advantages over the FIT: easy control of geometric parameter and less simulation time without compromising the accuracy. The limitations of the DDA will be deliberated as well.
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