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[IEEE 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz2018) - Nagoya, Japan (2018.9.9-2018.9.14)] 2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Terahertz (THz) Direct Detectors based on Superconducting HEBs with Thermal, Microwave and THz Biasing
摘要： Terahertz (THz) direct detectors based on superconducting niobium nitride (NbN) hot electron bolometers (HEBs) with thermal, microwave (MW) and THz biasing have been studied at 0.65 THz and 4.2 K in detail. The current responsivity and noise equivalent power (NEP) have been measured and compared respectively. The detectors with the MW and THz biasing have about one order higher current responsivity than that of the thermal one. With the MW biasing, an NEP at the order of pW/√Hz is obtained by choosing the MW frequency and power appropriately.
关键词： Terahertz,direct detectors,microwave biasing,niobium nitride,current responsivity,hot electron bolometers,superconducting,THz biasing,thermal biasing,noise equivalent power
更新于2025-09-09 09:28:46
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Particle-in-cell simulation of ultrafast hot-carrier transport in Fe/Au heterostructures
摘要： We present a theoretical approach for spin-polarized hot-electron transport, as it occurs after excitation by ultrafast optical pulses in heterostructures formed by ferromagnetic and normal metals. We formulate a spin-dependent particle-in-cell model that solves the Boltzmann equation for excited electrons. It includes lifetimes and transmission coefficients as parameters, which can be taken from ab initio calculations or experiment, and can be easily extended to multilayer systems. This approach is capable of describing electron transport in the ballistic, superdiffusive, and diffusive regime including secondary-carrier generation. We apply the model to optically excited carriers in Fe/Au bilayers and Fe/Au/Fe spin-valve structures and analyze theoretically the hot-electron transport dynamics probed in recent experiments on spin valves. We find contributions to the demagnetization dynamics induced in Fe/Au/Fe trilayers regardless of the parallel or antiparallel magnetic alignment of the Fe layers.
关键词： ferromagnetic and normal metals,ultrafast optical pulses,Fe/Au/Fe spin-valve structures,Fe/Au bilayers,Boltzmann equation,spin-polarized hot-electron transport
更新于2025-09-04 15:30:14
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Selective growth of palladium nanocrystals on the (100) facets of truncated octahedral Cu <sub/>2</sub> O for UV plasmonic photocatalysis
摘要： We report Pd-based UV plasmon-enhanced photocatalysis and its hot electron effect. The selective crystalline growth of Pd nanocrystals on the (100) facets of truncated octahedral Cu2O was conducted and proved. The photocatalytic activities of Pd/Cu2O at λ = 254 nm and at λ = 365 nm respectively had ca. 18- and 10-fold enhancements due to the hot electron effect.
关键词： palladium nanocrystals,UV plasmonic photocatalysis,hot electron effect,Cu2O
更新于2025-09-04 15:30:14