In article number 2100342, Hyungtak Seo, and co-workers demonstrated the flexoelectric effect-driven self-powered giant short-wavelength infrared photoresponse from centrosymmetric bulk silicon. By precisely controlling applied force, response sensitivity is controlled across a large range while maintaining exceptionally high sensitivity, good responsiveness, quick speed, even at nanoscale.

Although forbidden band effect in perfectly periodic phononic crystals (PC) is very attractive, random disordered (i.e. detuning) phenomenon inevitable engineering processing, thus exploring the of detuning on wave characteristics PC becomes a necessity. In this study, fundamental governing equations and boundary conditions are derived from principle virtual work. Wave localization factor one-d...

Non-conductive materials like rubbers, plastics, ceramics, and even semiconductors have the property of flexoelectricity, which means that they can generate electricity when bent twisted. However, an irregular shape or a peculiar load has been necessary condition to realize weight deformability specific ratios flexoelectricity solids are limited. In this work, we develop theoretical model three...

We report on nanoscale strain gradients in ferroelectric HoMnO(3) epitaxial thin films, resulting in a giant flexoelectric effect. Using grazing-incidence in-plane x-ray diffraction, we measured strain gradients in the films, which were 6 or 7 orders of magnitude larger than typical values reported for bulk oxides. The combination of transmission electron microscopy, electrical measurements, an...

We report on the converse flexoelectric effect in two bent-core nematic liquid crystals with opposite dielectric anisotropies. The results are based on electro-optic investigations of inplane field-driven distortions in homeotropic samples (the Helfrich method). They are interpreted by an extension of the Helfrich theory that takes into account the higher order distortions. The bend flexocoeffi...

In this paper, the buckling and vibration behaviour of functionally graded flexoelectric nanobeam is examined. The vibration and buckling formulations of functionally graded nanobeam are developed by using a new theory that’s presented exclusively for flexoelecteric nano-materials. So by considering Von-Karman strain and forming enthalpy equation based on displacement, polarization and electric...

The time dependent periodic distortion profile in a nematic liquid crystal phase grating has been measured from the displacement of tilt fringes in a Mach-Zehnder interferometer. A 0.2 Hz squarewave voltage was applied to alternate stripe electrodes in an interdigitated electrode geometry. The time-dependent distortion profile is asymmetric with respect to the polarity of the applied voltage an...