Abstract
The adhesion layer used in nanofabrication process of metallic nanostructures affects the surface plasmon modes. We characterize the localized surface plasmon resonances (SPRs) of gold nanodisks of various diameters and heights while varying the thickness of the Ti adhesion layers. Scattering, absorption, and extinction coefficient calculations show a significant dependence of the SPR on the size of nanostructures and the adhesion layer thickness. Comparisons of peak resonance wavelengths of different Ti adhesion layer thicknesses indicate a significant red shift and a reduction in amplitude as the Ti thickness increases. A comparison of spectral broadening of the plasmon mode indicates a linear increase with Ti thickness and percentage. In addition, the decay time of the plasmon mode decreased significantly as the adhesion layer size increases. These observations aid in understanding size dependent adhesion layer effects and optimized fabrication of single nanoplasmonic structures.
Highlights
When an electromagnetic wave is incident on a metal nanostructure, it induces collective coherent oscillations of conduction electrons on the surface of the metal, called surface plasmon resonances (SPRs)
The result demonstrates that the surface plasmon resonance wavelength, as well as the extent of the plasmon enhancement, is highly dependent on the size and shape of the structure [48,49,50,51,52]
Increasing tTi blue shifts Qabs and Qext by about 50 nm, a trend not shared by the Qscat resonance Fig. 2(a). This difference arises because scattering integrates the far field signal that predominantly originates from the surface of the Au while absorption measures the near field contribution that comes from both from Au and Ti [54]
Summary
When an electromagnetic wave is incident on a metal nanostructure, it induces collective coherent oscillations of conduction electrons on the surface of the metal, called surface plasmon resonances (SPRs). Many experimental methods have been developed to mitigate the effect of the adhesion layer by the use of metal oxides, functionalized molecules as adhesion layer [30,31,32], or fabricating structures without an adhesion layer such as dry-lift-off process [33] or “sketch and peel” lithography (SPL) [38]. Despite such efforts, most nanofabrication relies on the use of adhesive layers
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