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We report Au/Ag bimetallic nanocomposites as a highly sensitive plasmonic material. A unit approach via a three-dimensional numerical modeling is introduced to observe collective plasmon resonance in Au/Ag bimetallic nanocomposites as well as Au mono-metallic nanoensembles. Au nanoensembles provide consistently identical plasmon wavelength, independent of inter-unit distance. In analogy with mono-metallic...
This work presents plasmonic nanostructures on a large area for visible color filtering. The plasmonic nanostructures comprise alternate layers of silver nanoholes, ultrathin dielectric film, and silver nanoislands on a glass substrate. The plasmonic nanostructures were fabricated on a wafer level by using lithography-free methods such as metal dewetting of silver nanoholes, spin-coating of ultrathin...
This work demonstrates angle-sensitive plasmonic filters using complementary plasmonic structures of nanohole and nanodisk arrays. The band-stop characteristics of nanodisk arrays is used to attenuate the redundant plasmon resonances of nanohole arrays. The attenuation of second order resonances and angular sensitivity of the structures was optically measured. The second order resonance of nanohole...
This work reports straightforward approach for AuAg alloyed nanostructures with solid-state dewetting. Successive thin films evaporation and thermal annealing enable fabrication of AuAg alloyed nanostructures with well-defined sizes and shapes. The complete miscibility of Au and Ag leads to programmable tailoring of the plasmon resonance over the entire visible wavelength region by varying corresponding...
Surfaced enhanced Raman scattering (SERS) has been extensively exploited for label-free and non-destructive biochemical detections. Recently diverse SERS substrates have been reported to improve sensitivity of SERS. However, the current platforms still have technical limitation for in vivo applications. Here, we report a nanoplasmonic biopatch of plasmonic nanoparticles physically embedded in highly...
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