Abstract We investigate a hydrogen sensor based on Palladium (Pd) in plasmonic structure, where Pd layer is deposited gold substrate with an elliptical hole array. The will transform to Pd-Hx hydrogen-rich gas environment, it change the concentration of hydrogen. To ensure safety, H2 air must lower 4%. calculate absorption spectra (ΔA) by Finite-difference time-domain method (FDTD). results show That difference between absorptions H2-less(0%) and H2-rich(4%) environment ΔA can reach 0.136....

We report a giant resistance drop induced by dc electrical currents in La0.67Ca0.33MnO3 epitaxial thin films. Resistance of the patterned films decreases exponentially with increasing current and maximum shows at temperature peak Tp. Variation densities can be scaled below above Tp, respectively. This work useful for future applications electroresistance.

We propose a Metal–Insulator–Metal structure consists of two surface plasmon polaritons (SPPs) and an H-shaped resonator. The reflectance spectrum is numerically simulated by the two-dimensional finite-difference time-domain method. results show that this can act as pressure sensor. To our knowledge, first proposal to utilize SPP resonator form size be small few hundred nanometers. nano-scale sensor opens wide field for potential applications in biological biomedical engineering.

Li Nb O 3 ∕ -doped SrTiO3 heterojunction was fabricated by pulsed laser deposition. The current-voltage curve of this shows good rectifying property and changes with temperature dramatically. For the forward bias, conduction mechanism from Ohmic-like for low bias voltages to space charge limited current high voltages. While reverse it Schottky emission avalanche breakdown increasing voltage. results were explained considering band structures junction. This work demonstrates that...

A heterojunction has been fabricated by growing a La0.67Ca0.33MnO3 film on silicon with buffer layer of yttrium-stabilized zirconia (YSZ). The current-voltage measurement shows that it is diode good rectifying property. At low positive bias voltage, temperature dependence the junction resistance peak at certain temperature, which shifts to temperatures when voltage increased from 0.3Vto0.7V. This behavior quite different previous reports p-n junctions composed manganites and Nb-doped SrTiO3....

We report the colossal negative electroresistance (ER) in p-n heterostructure of La0.67Ca0.33MnO3−δ (LCMO) and Nb-doped SrTiO3. For a vacuum-annealed sample, maximum ER 4×104% can be reached by 1 mA current magnetic field has remarkable influence on sample. It is interesting that magnetoresistance also tuned electric current. The results were explained shunting model. In this scenario, determined resistance LCMO junction resistance. On other hand, are affected interaction these factors tune...

The superconducting and structural properties of a series ${\mathrm{Mg}}_{1\ensuremath{-}x}{\mathrm{Al}}_{x}{\mathrm{B}}_{2}$ samples have been investigated. X-ray diffraction results confirmed the existence transition associated with significant change in interboron layer distance as reported previously by Slusky et al. Moreover, transmission-electron-microscopy observations revealed superstructure doubled lattice constant along c-axis direction. We propose that this is probably related to...

In this paper, we show the simulation of a plasmonic band-pass filter which consists two surface plasmon polaritons (SPPs) waveguides and resonator in metal–insulator–metal (MIM) structure. The is formed by square rings patch between them. tiny rectangle cavity order to transfer SPPs from one ring other. finite element method (FEM) employed simulation. results that dual-ring performs better than single does. 3 dB bandwidth near peak wavelength λ = 1054 nm merely 31.7 nm. resonant can be...

We report the study of metal-STO-metal memristors where doping concentration in STO can be fine-tuned through electric field migration oxygen vacancies. In this tunnel junction device, evolution Density Of States (DoS) followed continuously across Metal-Insulator Transition (MIT). At very low dopant concentration, displays characteristic signatures discrete dopants levels. As increases, semiconductor band gap fills but a soft Coulomb remains. even higher doping, transition to metallic state...

We propose a metal–insulator–metal (MIM) structure which consists of [Formula: see text]-shaped resonator and surface plasmon polariton (SPP) waveguide. The finite element method (FEM) is employed in the simulation. results show that this forms an optical pressure sensor. transmission spectra have redshift with increasing pressure, relation between wavelength shift linear. nanoscale sensor shows high sensitivity may potential applications biological biomedical engineering.

An n-n heterojunction composed of La0.33Ca0.67MnO3 and Nb-doped SrTiO3 was fabricated, it shows good rectifying property. The temperature variation junction resistance for high reverse voltage exhibits a metal-insulator-like transition that shifts to temperatures with further increasing voltage. presents remarkable positive magnetoresistance under the bias at low temperatures, maximum can even reach ∼400% field 1T. A qualitative explanation is given based on analysis electron filling near...

The transmittance spectrum of a plasmonic filter has been numerically simulated by the two-dimension (2D) finite-difference time-domain method. is composed two Metal-Insulator-Metal waveguides and resonator with different rings. results show that rising edge asymmetric steeper than symmetric one at each pass band. By embedding liquid crystal in resonator, can act as an electro-optical switch. These potential applications on nano-optical devices.

We have fabricated a heterojunction by depositing La0.67Ca0.33MnO3 film on electron doped silicon wafer with buffer layer of natural SiO2. The current-voltage measurement shows that it is diode good rectifying property in wide temperature range. At high positive voltages, the curve space charge limited (SCL) current behavior, manifesting itself as SCL diode. low and negative resistance junction peak at certain temperature, which decreases increasing voltage keeps constant voltages....

In this letter, we present a novel optical temperature sensor based on nanoscale surface plasmon polariton (SPP) resonator. A bimetal layer is applied in the structure to detect changes temperature. The resonance wavelength of SPP resonator shifts with deformation layer. effect refractive index material also discussed. finite element method employed numerically calculate reflectance spectra. To best our knowledge, it first design an thermal deformation, and may be future integrated circuit.

In our previous study anisotropic magnetoresistance (AMR) and planar Hall effect (PHE) of epitaxial La2∕3Ca1∕3MnO3 (LCMO) thin films grown on SrTiO3(001) (STO) substrates were studied, a phenomenological model in the high field limit was developed based 4/mmm point group. The derived longitudinal resistivity includes four-fold as well two-fold symmetry term in-plane angle, which can fit experimental results well. this study, to highlight effects misfit strain, AMR PHE LCMO epitaxially...

All-optical switch is one of the key parts optical circuit. We employ a temperature-sensitive resonator to form an switch. The deforms under applied light and adjusts transmittance structure. To our knowledge, this first design all-optical surface plasmon polariton (SPP) based on heat deformation effect.

High quality superconducting YBa2Cu3O7-delta (YBCO) thin films have been successfully deposited on silicon-on-insulator (SOI) substrates buffered by an yttria-stabilized zirconia (YSZ) layer using the in situ pulsed laser deposition (PLD) method. X-ray diffraction (XRD) theta-2theta-scan and phi-scan, reflection high energy electron (RHEED), indicate that both YSZ YBCO are of crystallinity good lattice orientation. Atomic force microscopy (AFM) shows root mean square roughness R-q is less...

The resonance behaviors of local surface plasmon in Au monomer and dimer are characterized systemically by electron energy loss spectroscopy a scanning transmission microscope. measured absorption range is about 20 nm larger than the physical size nanoparticles peak shows red shift when beam passes nanoparticles. displays similar behaviors. Numerical simulation also reproduces those experimental results.

AbstractWe carried out the numerical simulations on plasmonic filters composed by a Metal–Insulator–Metal (MIM) waveguide and resonator of double rings. Both band-pass filter stop-band are discussed. The results show that characteristic wavelengths or have red shift when size increases. double-ring better sensitivity wavelength than one for single ring. based two-dimensional (2D) finite-difference time-domain (FDTD) method. introduced potential applications optical integrated...