In this work, nanostructured TiO2 and Cr-doped TiO2 thin films were deposited on glass substrate through sonochemical-chemical vapor deposition (CVD) method. The resulting thin films were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), UV-visible absorption spectroscopy, and photoluminescence spectroscopy techniques. The TiO2 thin film has nanocubic morphology and ...

For epitaxial films, a critical thickness (tc) can create a phenomenological interface between a strained bottom layer and a relaxed top layer. Here, we present an experimental report of how the tc in BiFeO3 thin films acts as a boundary to determine the crystalline phase, ferroelectricity, and piezoelectricity in 60 nm thick BiFeO3/SrRuO3/SrTiO3 substrate. We found larger Fe cation displacemen...

Concept and Key Idea Photonic-bandgap microcavities in optical waveguides have demonstrated cavity resonances at wavelengths near 1.55 μm band, quality factors on the order of 300, and modal volume at 0.055 μm3 in high-index contrast Si/SiO2 waveguides and GaAs air-bridge waveguides. Applications include zero-threshold microlasers, filters and signal routers. For tunability in Si microphotonic ...

The shear stress distribution between a partially electroded thin piezoelectric film and a semi-infinite elastic substrate is analyzed. It is shown that the shear stress is governed by a pair of integro-differential equations. These equations are solved numerically using the concept of elements and the finite difference method. A few special cases are treated analytically. The behavior of the s...

thin film phthalocyanines(pc), incloding zinc, iron, and magnesium phthalocyani-nes, were prepared by vacuum deposition method. chronocoulometry was used to study the charge transfer reaction mechanism of ionic species through the thin films. the results obtained in chronocoulometric studies shows that the thin film phthalocyanines could operate via two mechanisms.the first mechanism metal pc t...

We present a microfabricated grating whose period can be tuned in analog fashion to within a fraction of a nanometer. The tunable angular range is more than 400 microrad in the first diffracted order. The design concept consists of a diffractive grating defined onto a 400-nm membrane, with the membrane subsequently strained in the direction perpendicular to the grating grooves by thin-film piez...

We have investigated the effect of texture on in-plane sIPPd and out-of plane sOPPd polarizations of pulsed-laser-deposited BaTiO3 thin films grown on Pt and La0.5Sr0.5CoO3 sLSCOd buffered Pt electrodes. The OPP and IPP polarizations were observed by piezoresponse force microscopy sPFMd for three-dimensional polarization analyses in conjunction with conventional diffraction methods using x-ray ...

Related Articles Large and stable piezoelectric response in Bi0.97Nd0.03FeO3 thin film Appl. Phys. Lett. 100, 172904 (2012) Imaging of subatomic electron cloud interactions: Effect of higher harmonics processing in noncontact atomic force microscopy Appl. Phys. Lett. 100, 163104 (2012) Qualitative determination of surface roughness by in situ reflection high energy electron diffraction Appl. Ph...

Piezoelectric properties of three sol-gel derived Pb Zr0.53Ti0.47 O3 thin film specimens of different thicknesses integrated onto Pt/Ti/SiO2 Si substrates are investigated to delineate the influence of residual stress on the strain-field response characteristics from other thickness related effects. Residual tensile stresses are determined from wafer curvature measurements for films ranging in ...

Piezoelectric diaphragms are used as synthetic jets because of their size, rapid time response, and relatively low power consumption. Among the piezoelectric diaphragms used are unimorphs and Bimorphs. In this study, a bimorph diaphragm, a thin Unimorph pre-stressed device and a Radial Field Diaphragm (RFD) are compared. A bimorph consists of two bonded PZT discs, a thin Unimorph pre-stressed d...