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Full-Text Articles in Engineering
Enhanced And Tunable Optical Quantum Efficiencies From Plasmon Bandwidth Engineering In Bimetallic Coag Nanoparticles, A. Malasi, H. Taz, M. Ehrsam, J. Goodwin, H. Garcia, Ramki Kalyanaraman
Enhanced And Tunable Optical Quantum Efficiencies From Plasmon Bandwidth Engineering In Bimetallic Coag Nanoparticles, A. Malasi, H. Taz, M. Ehrsam, J. Goodwin, H. Garcia, Ramki Kalyanaraman
Faculty Publications and Other Works -- Materials Science & Engineering
Plasmonic nanoparticles are amongst the most effective ways to resonantly couple optical energy into and out of nanometer sized volumes. However, controlling and/or tuning the transfer of this incident energy to the surrounding near and far field is one of the most interesting challenges in this area. Due to the dielectric properties of metallic silver (Ag), its nanoparticles have amongst the highest radiative quantum efficiencies (η), i.e., the ability to radiatively transfer the incident energy to the surrounding. Here we report the discovery that bimetallic nanoparticles of Ag made with immiscible and plasmonically weak Co metal can show comparable and/or …
Nanomaterials Synthesis By A Novel Phenomenon: The Nanoscale Rayleigh-Taylor Instability, S. Yadavali, Ramki Kalyanaraman
Nanomaterials Synthesis By A Novel Phenomenon: The Nanoscale Rayleigh-Taylor Instability, S. Yadavali, Ramki Kalyanaraman
Faculty Publications and Other Works -- Materials Science & Engineering
The Rayleigh-Taylor (RT) interfacial instability has been attributed to physical phenomenon in a wide variety of macroscopic systems, including black holes, laser generated plasmas, and thick fluids. However, evidence for its existence in the nanoscale is lacking. Here we first show theoretically that this instability can occur in films with thickness negligible compared to the capillary length when they are heated rapidly inside a bulk fluid. Pressure gradients developed in the evaporated fluid region produce large forces causing the instability. Experiments were performed by melting Au films inside glycerol fluid by nanosecond laser pulses. The ensuingnanoparticles had highly monomodal size …