This presentation focuses on structure property/relationships in advanced materials, emphasizing multifunctional systems that exhibit multiple functionalities. Such systems are then used as building blocks for the fabrication of various emerging technologies. In particular, nanostructured materials synthesized via the bottom–up approach present an opportunity for future generation low cost...
In the last decade, our knowledge of the linear and nonlinear optical response of LiNbO3 crystals has substantially improved [1]. Precise optical measurements on samples of well known composition allowed to distinguish, e.g., polaronic signatures, while refined ab initio models allowed to disentangle the various effects contributing to the measured spectra and to assign spectral signatures to...
LiNbO3 films constitute an attractive photorefractive medium offering the possibility of inducing reconfigurable optical functions either with beams guided in the film or with an illumination transverse to the film. Several additional motivations animate the study of the photosensitivity of LiNbO3 films. Performances such as sensitivity and response time are improved compare to bulk due to the...
Domain-engineered structures play an essential role in nonlinear optics for quasi-phase-matched parametric processes. Recently, we have discovered a pyroelectric field-assisted domain inversion approach that can be used to switch ferroelectric domains in magnesium doped lithium niobate without using an external applied electric field. The process works as follows. First, permanent defects are...
Perovskite-structured bismuth ferrite (BiFeO$_3$, BFO) is one of very few ‘true’ multiferroic single-phase materials with both ferroelectric and antiferromagnetic ordering. With a Curie temperature above 1000 K, it is also a prime candidate for high-temperature applications. Photovoltaic conversion efficiencies of more than 10% were reported for above-bandgap illumination in epitaxial BFO...
With their linear electro-optic effect, i.e. the linear change in the refractive index under an electric field, complex ferroelectric oxides are an ideal candidate to control the propagation of light in the field of integrated optics.
The research focused on the integration of thin ferroelectric films for electro-optic applications is concentrated on a few promising systems such as barium...
We propose a method for simultaneous control of three elements of light wave; amplitude, phase, and polarization by dielectric meta-surfaces based on the principle of double phase holography. Meta-surfaces consisting of one type of meta-atom can independently control only two of the three elements. In double phase holography, the intensity is modulated by the interference of light waves of two...
