Abstract
The particle size limit for enhanced infrared absorption on metal nanostructures was identified using an infrared spectrometer and microscope accessory for well-defined periodic gold square column (SC) arrays with various nanoparticle sizes on silicon wafers fabricated by electron beam lithography. The sizes of SC arrays are compatible with those of vacuum evaporated thin metal films, which are used conventionally for surface-enhanced infrared absorption. The experimental results revealed that the particle size limit for the enhancement was about one-tenth of wavelength of infrared radiation. It indicates that this ratio limits the applicability of effective medium approximation in the SC model.
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