Spoof plasmon surfaces consisting of linear arrays subwavelength grooves are proposed as a novel platform for THz sensing. The tightly confined spoof plasmons, coupled via an Otto prism setup, sensitive to the refractive index dielectric filling grooves. Phase jumps at resonances used readout response An overall sensitivity 0.49 RIU−1 with figures-of-merit high 49 achieved.

Plasmonic resonances with a Fano lineshape observed in metallic nanoclusters often arise from the destructive interference between dark, subradiant mode and bright, super-radiant one. A flexible control over profile characterized by its linewidth spectral contrast is crucial for many potential applications such as slowing light biosensing. In this work, we show how one can easily but significantly tailor overall plasmonic nanocluster systems, example, quadrumers pentamers, selectively...

In this paper, we show that broadband spectral data can be experimentally extracted from corrugated metallic surfaces consisting of a linear array subwavelength grooves supporting tightly confined spoof plasmons. Using combination the scattering edge coupling method and short-time Fourier transform, are able to discern group velocity characteristics plasmon pulse, which in turn allows for extraction dispersion 0.4 1.44 THz single measurement. Refractive index sensing various fluids is...

Arrays of plasmonic pentamers consisting five metallic nano-disks were designed and fabricated to achieve a pronounced Fano Resonance with polarization-independent far-field spectral response at normal incidence due the structure symmetry pentamers. A mass-spring coupled oscillator model was applied study plasmon interactions among nano-disks. It found that direction excitation light polarization can flexibly tune spatial localization near-field energy sub-wavelength scales while collective...

Thin films of HfO2 high-k dielectric have been prepared by pulsed-laser deposition at various substrate temperatures and pressures. X-ray diffraction, atomic force microscopy, secondary ion mass spectroscopy ellipsometry were used to characterize the deposited films. Experimental results show that temperature has little effect on stoichiometry, while pressure plays an important role in determining ratio Hf O. It is also found optical properties thin strong dependence both pressure. The...

In this paper, we show that by using two adaptive neural networks (NNs), each of which is tailored for a specific task, the tracking performance hard-disk-drive (HDD) actuator can be significantly improved. The first NN utilizes accelerometer signal to detect external vibrations and compensates its effect on HDD position via feedforward action. second designed compensate pivot friction. appealing advantage compensators design does not involve any information plant, sensor, disturbance...

Terahertz antenna arrays supporting narrow lattice resonances are proposed as an alternative sensor-on-chip approach to liquid sensing. An array of metallic rectangular antennas fabricated on a polyethylene naphthalate (PEN) substrate is used demonstrate the sensing number fluids. Good agreement shown between experiment and simulation with Q-factors around 20 figure-of-merit (FOM) 3.80 being achieved. Liquid simple both in terms fabrication setup. The working frequency can be tuned suitable...

We report a systematic investigation on the structural and magnetic properties of molecular-beam epitaxial growth CrTe thin films with different layer thicknesses Cr∕Te flux ratios. A phase diagram parameters is established based detailed analyses reflection high-energy electron diffraction patterns, atomic force microscopy, magnetization. Our high-resolution transmission microscopy results show that under appropriate conditions, metastable zinc-blende (ZB) film can be achieved nominal...

We have studied the switching characteristics and magnetoresistance of pseudo-spin-valves with perpendicular anisotropy based on CoFe∕Pd multilayers. In unpatterned thin films without exchange biasing, a maximum current-in-plane giant 7% was achieved, highest reported to date in pseudo-spin-valves. A Ta seed layer fcc (111) orientation Pd shown be important order achieve good sharp behavior. The improvement decay upon postdeposition annealing been attributed formation CoPd alloys at interfaces.

We have studied spin transfer switching (STS) in a magnetic tunnel junction with perpendicular anisotropy for the reference and free layers using Landau–Lifshitz–Gilbert formalism. propose multilayer structure which insertion of an additional polarizer in-plane can enhance STS efficiency speed device. It is revealed that canted angle between 40° 80° out film plane correct direction enhances more than fixed or polarizer. Furthermore, we show torque exerted on layer by automatically tilts both...

Arrays of planar symmetric gold quadrumers consisting a central nano-disc surrounded by three similar nano-discs belonging to the D3h point group were designed and fabricated. Since geometrical configuration is same as trigonal molecules, can play roles artificial atoms study coupling trends among them. The plasmonic properties structures are investigated reflection spectrum measurement finite-difference time-domain calculation with good agreement. Plasmon interaction also studied via...

Arrays of asymmetric pentamers are designed and fabricated with an offset the central nano-disk position to study effect symmetry breaking in pentamers. It is found that while planar symmetric oligomers can exhibit a single Fano Resonance (FR), at controlled gap 3 nm from nearest neighbor nano-disk, gives rise appearance additional dark mode potentially be used localized surface plasmon resonance sensing. shown this leads second FR same spectrum. The simulation results good agreement...

We present results of the magnetic, structural, and chemical characterizations Mn+-implanted Si displaying n-type semiconducting behavior ferromagnetic ordering with Curie temperature, TC, well above room temperature. The temperature-dependent magnetization measured by superconducting quantum interference device from 5 to 800 K was characterized three different critical temperatures (TC*∼45 K, TC1∼630–650 TC2∼805–825 K). Their origins were investigated using dynamic secondary ion mass...

We describe a strategy to reduce spin transfer switching (STS) currents in CoFe/Pd-based perpendicular anisotropy single valves (SSVs) by the insertion of an in-plane polarizer, thus creating modified-dual valve (m-DSV). For SSV devices, concurrent STS both magnetic layers was observed for positive currents, making parallel-to-antiparallel (P→AP) transition impossible. In m-DSV we 60% reduction energy barrier AP→P transitions and 40% JcAP→P with 10 ns current pulses compared devices....

Cubic aluminum nitride (c-AlN) thin films have been deposited at room temperature on silicon substrates by nitrogen-ion-assisted pulsed laser ablation of a hexagonal AlN target. The exhibit good crystal properties with sharp x-ray diffraction peaks. influences the nitrogen ion energy morphological, compositional, and electronic studied. ions can effectively promote formation Al–N bonds improve films. A 400 eV is proposed to deposit high quality c-AlN

A periodic array of magnetoelectric barriers is modeled to achieve maximum spin polarization (P) at high transmission probability (T). Each double-pair unit the consists four magnetic designed in several ways, such that an electron passing through, Landau gauge A=(0,Ay(x),0), acquires zero gain kinetic energy. This enables multiple double-pairs be used enhance P without sacrificing T. By tuning barrier heights, a 75%–100% obtained 0.8–1.0EF, for 27 array. For antisymmetrical arrays,...

Ti(250 Å)/Al(2200 Å)/Pd(600 Å)/Au(1600 Å) contact on aqua-regia surface treated n-GaN (Si∼1.0×1019 cm−3) has yielded a minimum specific resistance (ρc) of 4.21×10−8 Ω cm2, achieved after thermal annealing at 500 °C for 8 min. This is superior to the most common contact, Ti/Al, which also been studied in current work and produced lowest ρc 4.63×10−6 obtained 700 2 The long-term stability analysis revealed that Ti/Al/Pd/Au more stable than Ti/Al n-GaN. projected mean time 50% increase ρc(μ50)...

The authors investigate the magnetic and transport behaviors of Ge1−xMnxTe thin films with high Mn composition (x=0.98) grown by solid-source molecular-beam epitaxy. temperature-dependent magnetization (M-T) gives a Curie paramagnetic temperature θp∼120K, in contrast to TC∼95K obtained from Arrott plot resistivity measurement. M-T can be attributed weak localization effect disordering. discussed ferromagnetism Ge0.02Mn0.98Te on basis Ruderman-Kittel-Kasuya-Yoshida interaction clustering effect.

In this study, B-doping of vapour–liquid–solid (VLS) grown Si nanowires was studied. First, the different effects B2H6 gas on nanowire structures during VLS growth both Au-catalysed and Al-catalysed were investigated. While with reveal significant morphological changes, resulting in cone-shaped nanowires, comparable to un-doped nanowires observed from Si which may be explained by thermodynamic properties Au Al catalyst presence boron. addition, successful incorporation boron controllability...

Switching characteristics and magnetoresistance of spin valves with perpendicular anisotropy based on Co-Fe/Pd multilayers deposited by ultrahigh vacuum (UHV) sputtering have been studied. In unpatterned thin films without exchange bias, high current-in-plane giant (CIP-GMR) 9.7% 15.2% in single-spin (SSVs) dual-spin (DSVs) was measured, a significant improvement over previous work. We describe the effects Ta seed layer postdeposition annealing valves, which can be attributed to improvements...