The tunable localized surface plasmons in novel antenna of Au nanosphere dimer coated by graphene is studied theoretically. We demonstrate the electronic tuning of graphene based Au nanosphere antenna via modifying the Femi level of graphene for realizing active tunable localized surface plasmons. It is found that localized electronic field shows an evident increasing, as the graphene layers increase. The resuts are explained as the more evidently enhanced resonance of localized surface plasmons for multilayer graphene than monolayer graphene nanoantenna when the incident light matches to the resonance wavelength of the Au-graphene hybrid system. In addition, it is revealed there is observable blue-shift for the resonance wavelength when the graphene layers get increased. The study provides basic understanding for tuning graphene based on Au nanosphere antenna for a wide range of applications such as single-molecule fluorescence, SERS and photothermal therapy.
We present a fabrication method for 3D microtransformers with air core inside silica glass by means of femtosecond-laser-wet-etching (FLWE) and metal-microsolidifying, for very high frequency applications. A fabricated transformer with 24turns of primary coil and 12 turns of secondary coil,yielded an inductance of 70nH and 55nH. The maximum transformer efficiency of 62% was measured at a load of 50 Ω. Finally, the embedded 3D micro-transformer can be easily integrated with other microelectrical, mechanical and optical systems, applying in MEMS, sensors and lab-on-chips.
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