Plasmonic tweezers have become an important tool for the capture, manipulation, and characterization of nanoparticles (NPs), biomolecules, and viruses. However, the physical environment in the microscale strongly affects the trapping performance of plasmonic nanostructures. We demonstrated the trapping of gamma-aminobutyric acid (GABA) functionalized gold NPs at different solution temperatures and viscosities. Experimental results show that the trapping stiffness decreases from 0.3 to 0.1 fN/nm as the temperature increases from 25°C to 37°C. For solutions with higher viscosity, the trapping stiffness increases but the trapping efficiency would be reduced due to hindered movement of particles.
Light propagation and acoustic vibrations can be controlled by designing the bandgap of phoxonic crystals, which support photonic and phononic bandgaps simultaneously. In this study, we numerically investigated the optical and mechanical properties of a clover-shaped 6H-SIC crystal microcavity. The results indicate that the frequency range of the phononic bandgap can be manipulated by adjusting the geometry of the structure, resulting in a wide phononic bandgap over 12 GHz centered at 30.8 GHz. The structure also supports strong localized optical modes for visible light with a Q-factor over 143. Within the photonic and phononic bandgaps of the phoxonic crystal, the structure can reduce mechanical vibrations and support a confined optical mode that can be used for trapping nanoparticles.
Refractory material with surface plasmonic structures have the function of spectrum selective absorption and radiation spectrum regulation. In this paper, we design an absorber with periodic cylindrical nanostructures and a dielectric layer of Al2O3 based on the substrate of metal Tantalum (Ta). The energy absorption characteristics of the absorber have been simulated and analyzed by changing various constructional parameters. The simulation results indicate that structural parameters have great influence on the spectrum absorption in the range of wavelength 400-4000nm. The period and radius of nanostructure have a important effect on the absorption peaks in the infrared region. Infrared absorption peak can reach more than 99% and produce a red shift due to parameters changing. At the whole visible field, the absorption enhancement effect is significant. The refractive index and thickness of dielectric layer also have an obviously effect on the absorption spectrum. Furthermore, it is also obviously that thickness of dielectric layer has enhancement effect on absorption of infrared spectrum. The research found that the absorption and radiation spectrum of surface plasmonic materials can be effectively controlled by combining the high temperature radiation characteristics of high temperature metal. Thermophotovoltaic system can provide a kind of new methods and ideas for improving conversion efficiency, energy saving and consumption reducing.
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