Lithium niobate (LN) and lithium tantalate (LT) are ferroelectric crystals with a wide range of applications, extending from piezoelectric sensors to integrated photonics. Their structural similarities enable the combination of these materials to LiNb$_\text{x}$Ta$_\text{1-x}$O$_\text{3}$ (LNT) alloys. As the optical absorption edge depends on the stoichiometry, it can be used to determine the...
The photogalvanic effect (PGE) consists in the spontaneous production of a bulk electrical current density in a polar material when the latter is illuminated [1]. This effect triggers several phenomena which are at the basis of important applications such as photorefraction, photovoltaic energy conversion in photoferroelectrics, photocatalysis and so on [2,3,4].
Despite the fact that a...
The Sn2P2S6 crystals are known as efficient photorefractive materials, that can be efficiently modified by their doping. Our recent works are directed to a search for the new efficient dopants and their combinations, which are provided by two methods: growth in the presence of two types of the impurities, and by the indiffusion of the metals (Cu, Ag) into previously grown samples. In the...
The formation, transport and relaxation kinetics of small polarons with strong coupling have been studied intensively in lithium niobate (LN) over the last decades. The gained knowledge helped to understand the (non-)liner optical and photoelectric properties of LN on a microscopic level. The question of the transferability of these findings to other, comparable ferroelectric crystal systems...
Polar oxide nanoparticles like LiNbO3, KNbO3 or NaNbO3, are of increasing interest as multimodal markers in biological environment thanks to the their pronounced electro-optical, piezo-electrical, pyro-electrical, photorefractive and nonlinear optical effects. For instance, the latter one allows for a particular type of multiphoton imaging (non-bleaching, non-blinking, high-contrast, etc.)...
Lithium niobate tantalate solid solutions ($\mathrm{LiNb_{1-x}Ta_xO_3}$, LNT) represent a promising material system for nonlinear photonics and quantum technologies. It is because their nonlinear optical and photophysical properties can be selectively tuned by composition (0 < x < 1) from the properties of the edge compositions lithium niobate (LN, x = 0) and lithium tantalate (LT, x = 1). So...
Introduction- There is an important interest and research work being undertaken by various research groups worldwide on natural dye applications due to its friendly environment and the viability and the high potential of these dyes to be used as optical materials for industrial and scientific applications. Indeed, there is a needing interesting in developing green novel hybrid photonics....
As X-ray measurements have shown, domain walls in LiNbO$_3$ exhibit the structure of compressed bulk material [1]. Hence, knowledge of the optical response of LiNbO$_3$ as a function of compression can help to characterize the domain walls of LiNbO$_3$ and yields information about their optical signatures.
In our work, we model linear and non-linear optical properties of LiNbO$_3$ in...
Ta2O5 is known as a relatively chemically inert material with high density and high refractive index. It has low absorption and is therefore usually employed in optical coatings for applications from near-UV to near-IR, e.g. for mirror coatings in gravitational-wave detectors.
Experimental studies of thermically produced nanocrystals in amorphous Ta2O5 thin films indicate a new crystalline...
The actuation of liquid droplets on a surface has important implications in many industrial applications and microfluidics. The reproducible motion of water droplets on solid surfaces is very difficult to achieve because of the presence of surface defects. Bioinspired liquid-infused surfaces (LISs), made of textured materials imbibed with a low surface tension oil, exhibit various unique...
Photovoltaic optoelectronic tweezers (PVOT) have emerged as a powerful tool for the manipulation of a wide variety of micro/nano-objects (particles, liquid droplets, bubbles or biological material) based on the electric fields induced by the bulk photovoltaic effect, often using LiNbO3:Fe crystals. Nevertheless, the manipulation of such objects in aqueous media has remained mostly elusive so...
Various manifestations of small polarons strongly affect the linear and nonlinear optical properties of the oxide crystal lithium niobate (LiNbO3, LN). While related transient absorption phenomena in LN have been extensively studied in recent decades, a sound microscopic picture describing the blue-green (photo)luminescence of lithium niobate single crystals is still missing. In particular,...
Monoclinic gallium oxide $\beta$-Ga$_2$O$_3$ demonstrates an interesting combination of physicochemical parameters which advance its application in modern electronics and optics. The crystal with the band gap of $\sim4.8$ eV is transparent in the range from visible to near UV light, that is why the material is suitable for the implementation of solar-blind detectors of deep ultraviolet...
Nonlinear Optical Effect of Natural Dyes Extracted from Hibiscus Sabdariffa with its Application as an All-Photonic Switching
Haitham Al-tameemi* and Maha Alhamadani
Laser Applications Research Group (LARG), Department of Physics, College of Science, University of Basrah, Basrah, Iraq
*Corresponding Author:
Email: haithamsaadon@yahoo.com (Haitham) and mahabct@yahoo.com...
