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Nanosphere lithography provides an e-beam free method for patterning gold nanoplasmonic antennas. By combining this technique with deep-UV photolithography, we fabricate Si3N4 waveguides interfaced to plasmonic antennas capable of exciting and collecting surface-enhanced Raman spectra.
Using surface-enhanced Raman spectroscopy on gold-nanoparticle-decorated silicon nitride chips, we monitor the release of dextran-rhodamin molecules from capsules inside living cells. This demonstrates the feasibility of using photonic chips for intracellular sensing at visible wavelengths.
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