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See detailNanoscale Phononic Analog of the Ranque-Hilsch Vortex Tube
Medrano Sandonas, Leonardo UL; Rodríguez Méndez, Álvaro; Gutierrez, Rafael et al

in Physical Review Applied (2021), 15(034008),

Thermal management is a current global challenge that must be addressed exhaustively. We propose the design of a nanoscale phononic analog of the Ranque-Hilsch vortex tube in which heat flowing at a given ... [more ▼]

Thermal management is a current global challenge that must be addressed exhaustively. We propose the design of a nanoscale phononic analog of the Ranque-Hilsch vortex tube in which heat flowing at a given temperature is split into two different streams going to the two ends of the device, inducing a temperature asymmetry. Our nanoscale prototype consists of two carbon nanotubes (capped and open) connected by molecular chains. The results show that the structural asymmetry in the contact regions is the key factor for producing the flux asymmetry and, hence, the induced temperature-bias effect. The effect can be controlled by tuning the thermal-equilibration temperature, the number of chains, and the chain length. Deposition on a substrate adds another variable to the manipulation of the flux asymmetry but the effect vanishes at very large substrate temperatures. Our study yields insights into the thermal management in nanoscale materials, especially the crucial issue of whether the thermal asymmetry can survive phonon scattering over relatively long distances, and thus provides a starting point for the design of a nanoscale phononic analog of the Ranque-Hilsch vortex tube. [less ▲]

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See detailFörster-resonance energy transfer between diffusing molecules and a functionalized plasmonic nanopore
Zambrana-Puyalto, Xavier; Ponzellini, Paolo; Maccaferri, Nicolò UL et al

in Physical Review Applied (2020), 14(5), 054065

Plasmonic nanopores are the subject of extensive investigations as a potential platform to enable efficient optical read-out in translocation experiments with biomolecules such as DNA and proteins. They ... [more ▼]

Plasmonic nanopores are the subject of extensive investigations as a potential platform to enable efficient optical read-out in translocation experiments with biomolecules such as DNA and proteins. They allow for the engineering of electromagnetic fields at the nanoscale, which are typically used to enhance the emission efficiency of fluorescent molecules. Their features make them suitable for detection strategies based on the energy transfer between translocating molecules and the nanopore itself. Here, we have carried out an optical experiment to show that a handful of diffusing dyes acting as donors can exchange energy via Fster resonance energy transfer (FRET) with a gold nanopore functionalized with dyes behaving as acceptors. The FRET pair is composed of ATTORho6G (donor) and Alexa610 (acceptor). To perform this proof-of-concept experiment, we used a gold nanopore with a diameter of 80 nm, prepared on a Si3N4 membrane. We have observed that the presence of the acceptors on the walls of the nanopore reduces the lifetime of the diffusing donors. In addition, we have observed that the presence of the acceptors reduces the fluorescence signal on the donor detection channel and increases the fluorescence signal on the acceptor detection channel. The combination of these three effects gives us enough evidence to claim that the diffusing donors exchange energy with the functionalized nanopore via FRET, despite the relatively large size of the nanopore. The FRET efficiency of the process has been found to be of the order of 30%, which is in a fairly good agreement with a theoretical value obtained using a simplified model. [less ▲]

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See detailOxidation as Key Mechanism for Efficient Interface Passivation in Cu(In,Ga)Se2 Thin-Film Solar Cells
Werner, Florian UL; Veith-Wolf, Boris; Spindler, Conrad UL et al

in Physical Review Applied (2020)

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See detailQuasi-Fermi-Level Splitting of Cu-Poor and Cu-Rich CuInS2 Absorber Layers
Lomuscio, Alberto UL; Rödel, Tobias UL; Schwarz, Torsten et al

in Physical Review Applied (2019), 11

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See detailAbsorption Coefficient of a Semiconductor Thin Film from Photoluminescence
Rey, Germain UL; Spindler, Conrad UL; Rachad, Wafae UL et al

in Physical Review Applied (2018), 9

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See detailDeep Defects in Cu2ZnSnðS;SeÞ4 Solar Cells with Varying Se Content
Levcenko, S.; Just, J.; Redinger, Alex UL et al

in Physical Review Applied (2016)

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