The rational design and fabrication of metallic nanostructures has fostered the development of a variety of plasmon-mediated surface-enhanced spectroscopies. Surface-enhanced Raman spectroscopy and surface-enhanced infrared absorption have been proposed as analytical methodologies to probe a variety of surface and interfacial related molecular phenomena.[1] SEIRA is particularly limited by the necessity of obtaining a homogeneous field enhancement over the fingerprint region that lies from 5 to 10 microns. In this work, we have developed a series of gold dendritic fractals capable of supporting localized surface plasmon resonances across the near- and mid-infrared spectral regions [2,3]. Structures were fabricated by electron-beam lithography yielding tunable resonances in the mid-infrared range. Mid infrared microscopy measurements were conducted in transmission at the Canadian light source. Polarization modulation measurements under microscopy conditions were also conducted to reveal and exploit the anisotropy of such structures.

Fractal plasmonics: Optical properties from the visible to the mid-IR spectral range

2019 Fall National Meeting

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