Abstract
We investigate the resonance modes of gold nanorods on an Indium tin oxide (ITO) coated glass substrate using spectroscopic ellipsometry. The unit cell of the structure investigated is composed of two gold nanorods with differing lengths. In such a structure, we can excite the bright resoance and the dark resonance modes. Numerical simulation of the gold nanorod on substrate was performed with the bright resonance mode at 825.0 nm and the dark resonance mode at 1107.1 nm respectively. Using spectroscopic ellipsometry we optically characterize the fabricated gold nanostructure, with the bright resonance mode at 700.0 nm and the dark resonance mode at 1350.0 nm respectively. The experimental results from ellipsometry show a good agreement with the results from simulation.
Highlights
The advances in nanofabrication procedures have led to an evolution in the experimental study of nanostructures
The structure is composed of gold nanorods deposited on an Indium Tin Oxide (ITO) coated glass substrate
A schematic of the unit cell of the structure is shown in Figure 1, which is composed of two gold nanorod of unequal lengths deposited on a substrate
Summary
The advances in nanofabrication procedures have led to an evolution in the experimental study of nanostructures. The use of techniques such as the electron beam lithography [1]-[5] and nanoimprint lithography [6]-[8] has enabled the fabrication of structures with dimensions in the nanometer range, thereby enhancing further research in nanofabricated structures. In a structure with asymmetry, the dark or subradiant mode is shown to be excited [9]-[13]. Our focus is mainly on the optical characterization of the fabricated structure. With advances in nano fabrication techniques comes with it improved methods for optical characterization of the fabricated nanostructures. A common technique for the optical characterization of nanostructures involves normal incidence transmission and reflection measurements [14]
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