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Oxide surface functionalization for infrared plasmonic sensing

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Abstract

Surface-enhanced infrared absorption (SEIRA) spectroscopy employs noble metal nanoparticles or nanostructures to enhance the characteristic absorption spectra of certain molecules. One of the critical steps is to achieve robust surface functionalization of the plasmonic nanostructures facilitating further functionalization or repeatable sensing performance. Here we explore the application of Al and ITO nanostructures in infrared spectroscopy and demonstrate surface functionalization with phosphonic acid that show strong bonding with oxide surface. We fabricated large-area aluminum (Al) metamaterial perfect absorber (MPA) based on nanosphere lithography (NSL)[1-2]. Near perfect absorption ~97% was achieved at resonance wavelength that is tunable by changing Al disk diameters. We took advantage of the presence of the Al2O3 layer and successfully detected presence of the self-assembly monolayer of phosphonic acid on the Al disks[1].

© 2017 Japan Society of Applied Physics, Optical Society of America

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