The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Efficient light management is critical for the enhancement of the efficiency of solar cells. The performance of a solar cell is determined by the efficiency of the absorption process of light via excitation of electron-hole pairs and extraction of these generated charge carriers. The absorption, in turn, has a few limiting factors: one is related to the small size and acceptance angle of the active...
In the paper heavy metal oxide glass co-doped with Er3+/Yb3+, Ho3+/Yb3+ and triply-doped with Er3+/Ho3+/Yb3+ ions have been presented. Glass from Bi2O3 - GeO2 - Ga2O3 - Na2O system has been characterized in terms of thermal and spectroscopic properties. As a result of energy transfer between lanthanides ions and superposition of emission bands (Er3+: 4I11/2 → 4I13/2, Ho3+: 5I6 → 5I7), broadband luminescence...
In this paper we report about the possibility to control a strong signal beam with a much weaker control beam, resorting to the linear optical phenomena known as coherent perfect absorption and transparency (CPA and CPT). First, analytical formulas for CPA and CPT in a realistic yet prototypical configuration of a substrate-backed optically conducting surface (graphene, metallic metasurface…) are...
We analyse theoretically the possibilities of contactless control of in-gap states formed by a pair of electrons confined in a triangular quantum ring. The in-gap states are corner-localized states associated with two electrons occupying the same corner area, and thus shifted to much higher energies than other corner states, but still they are below the energies of corner-side-localized states. We...
This work presents the nonlinear optical investigations of the neodymium (III) oxide thin films. Studied inorganic films were produced by physical vapor deposition (PVD) technique on glass substrate in high vacuum. The nonlinear optical properties were measured by using Nd:YAG laser at 1064 nm wavelength. Using the Maker fringe technique the third harmonic generation process was investigated. The...
Most of microwave devices are not optically transparent in the visible range. Optically transparent microwave devices, such as absorbers, filters and antennas, would be desirable since they could be fully exploited for shielding systems, military applications or integrated in window glasses and along with photovoltaics. These devices could also play a key role in micro- and nano-satellite applications...
We report our recent results of investigation of the interactions between localized plasmons in gold nanorods and excitons in J-aggregates. We were able to track an anticrossing behavior of the hybridized modes both in the extinction and in the photoluminescence spectra of this hybrid system. We identified the nonlinear optical behavior of this system by transient absorption spectroscopy. Finally...
We study the nonlinear absorption and refraction of 5,10,15,20-tetraphenyl-21H,23H-porphin cobalt(II) (CoTPP) and 5,10,15,20-tetrakis(4-methoxyphenyl)-21H,23H-porphin cobalt(II) (MCoTPP). The measurements were carried out in solutions prepared in chlorobenzene applying the D4σ-Z-scan technique with a laser delivering single pulses in the picosecond regime at 532 nm. For each compounds, the NL coefficients...
The influence of ordered plasmonic arrays on energy transfer from a quantum well to a quantum dot layer has been investigated. The ordered arrays are comprised of nanostructures of different geometries, including boxes, disks and rings. Despite no signature of non-radiative energy transfer in the absence of an array, an efficiency of ∼51% is observed for a ring array, though strong emission quenching...
The derivatives based on tetrathiafulvalene (TTF) are among the molecules which are characterized by their high nonlinear optical properties and are electro-actives molecules. When the TTF molecules and their derivatives are bonded to electron acceptors in order to forming D -A system, the intermolecular charge transfer (ICT) can be induced under light excitation, because tetrathiafulvalene are known...
We report on our research into fluoride fiber-based 3 µm class laser sources. Using holmium as the gain medium, record-high peak power levels are achieved in mode-locked laser systems that emit ultrashort pulses in the water vapor transmission window around 2.9 µm. Highly nonlinear and dispersion-engineered hybrid chalcogenide-polymer microwires are utilized to extend the frequency range of those...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.