Proceedings PaperAl nanoantennas for plasmon-enhanced infrared spectroscopy
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The high cost associated with the traditional plasmonic materials and the complex nanofabrication has hindered their practical applications and therefore alternative plasmonic materials and nanofabrication techniques are needed. Here, I combined cost-effective colloidal lithography and earth-abundant element, i.e. Al, to fabricate Al optical nanoantennas including Al nanotriangles and Al metamaterial perfect absorbers. I demonstrate surface functionalization of the nanoantennas using phosphonic acid and subsequent detection of the C=O vibration mode via surface-enhanced infrared absorption spectroscopy. In addition, the detection of a physically adsorbed thin polymer layer on the Al nanoantennas is demonstrated. Surface functionalization with phosphonic acid provides various functional groups to the Al surfaces opening up great opportunities for Al-based plasmonic nanostructures for biochemical sensing applications.