Browsing by Author "Rabin, Oded"
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Item Plasmonic nanoarcs: a versatile platform with tunable localized surface plasmon resonances in octave intervals(Optical Society of America Publishing, 2020-10-12) Zhang, Kunyi; Lawson, Andrew P.; Ellis, Chase T.; Davis, Matthew S.; Murphy, Thomas E.; Bechtel, Hans A.; Tischler, Joseph G.; Rabin, OdedThe tunability of the longitudinal localized surface plasmon resonances (LSPRs) of metallic nanoarcs is demonstrated with key relationships identified between geometric parameters of the arcs and their resonances in the infrared. The wavelength of the LSPRs is tuned by the mid-arc length of the nanoarc. The ratio between the attenuation of the fundamental and second order LSPRs is governed by the nanoarc central angle. Beneficial for plasmonic enhancement of harmonic generation, these two resonances can be tuned independently to obtain octave intervals through the design of a non-uniform arc-width profile. Because the character of the fundamental LSPR mode in nanoarcs combines an electric and a magnetic dipole, plasmonic nanoarcs with tunable resonances can serve as versatile building blocks for chiroptical and nonlinear optical devices.Item Remote Chemical Sensing by SERS with Self-Assembly Plasmonic Nanoparticle Arrays on a Fiber(Frontiers Media, 2022-01-25) Zhang, Xin; Zhang, Kunyi; von Bredow, Hasso; Metting, Christopher; Atanasoff, George; Briber, Robert M.; Rabin, OdedAn optical fiber was modified at the tip with a self-assembled plasmonic metamaterial that acts as a miniature surface-enhanced Raman spectroscopy (SERS) substrate. This optical fiber-based device co-localizes the laser probe signal and the chemical analyte at a distance remote from the spectrometer, and returns the scattered light signal to the spectrometer for analysis. Remote SERS chemical detection is possible in liquids and in dried samples. Under laboratory conditions, the analyte SERS signal can be separated from the background signal of the fiber itself and the solvent. An enhancement factor greater than 35,000 is achieved with a monolayer of the SERS marker 4-aminothiophenol.