Materials Literature
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Through high temperature synthesis at 1300 °C and above, our group has discovered and characterized the novel CaRE 3 SbO 4 and Ca 2 RE 8 Sb 3 O 10 phases (RE = Ce–Nd, Sm–Dy for CaRE 3 SbO 4, RE = La–Nd, Sm–Dy for Ca 2 RE 8 Sb 3 O 10 ). This result was motivated by the idea of opening a band gap and introducing structu…
In order to take into account the dual‐phase ferrite/pearlite microstructures of the X65 steel in the simulations of the U‐ and O forming steps of the production of a gas pipeline tube, a multi‐scale approach based on a two‐level homogenization scheme is applied. Three different scales are introduced: the nano‐scale o…
Variation of two-photon absorption (2PA) of organic chromophores as a function of the environment such as different solvent polarity has important implications for practical applications of nonlinear optical (NLO) materials but could be also used as a sensitive probe of local inter- and intra-molecular interactions. W…
An innovative method of examining properties of metasurfaces is presented. A pump-probe technique is used to create a metasurface composed of conductive shapes on a silicon surface. A wave-front of intense pulse of 82 fs from Ti:Sa laser with wavelength of 800 nm is shaped by a spatial light modulator and then focused…
Conventional metals with high carrier concentrations have served to date as the materials of choice for plasmonic and metamaterial devices. However, typical metals are not well suited for near IR (NIR) plasmonic applications because their associated plasma frequencies correspond to the visible and ultraviolet regions…
With current technologies, dislocation-free bulk shape GaN crystals with centimeter-size can be grown from small seed crystals. This technique can be realized by putting a sapphire plate with a small hole (0.5~1.5 mm in diameter) on a GaN plate seed. Centimeter-sized bulk GaN single crystals with large dislocation-fre…
We present the results of studies carried out for oversaturated solutions with common laser dye 4- (Dicyanomethylene)-2-methyl-6-(4-dimethylaminostyryl)-4H-pyran (DCM) and 3-(1,1-Dicyanoethenyl)-1-phenyl-4,5- dihydro-1H-pyrazole (DCNP) nonlinear chromophore. We show that oversaturating the solution leads to formation…
Internal Quantum Efficiency (IQE) of two-colour monolithic white light emitting diode (LED) was measured by temperature dependant electro-luminescence (TDEL) and analysed with modified rate equation based on ABC model. External, internal and injection efficiencies of blue and green quantum wells were analysed separate…
The idea on a homogeneous nuclear reactor, first suggested by Ya B Zeldovich and Yu B Khariton in 1939, has since had its ups and downs and is now re-emerging, enriched with the knowledge and experience accumulated over the years having past. One of the current versions of the idea, the fast molten-salt reactor with a…
We demonstrate greatly enhanced light absorption by monolayer graphene over a broad spectral range, from visible to near infrared, based on attenuated total reflection (ATR). The designed structure consists of two dielectric media and monolayer graphene between them. Up to 42.7% light absorption has been achieved by t…
Performance of III-N based solid-state lighting is to a large extent limited by current transport effects that are also expected to contribute to the efficiency droop in real devices. To enable studying the contributions of electron transport in drooping more accurately, we develop and study a coupled Monte Carlo–drif…
We present a microscopic study on the pump fluence dependent carrier relaxation dynamics in optically excited graphene. Our investigation focuses on the particular role of efficient Auger processes on the carrier dynamics in different excitation regimes. It turns out that for low fluence excitations, the carrier gener…
Ga-doped ZnO films of thicknesses 3 – 500 nm were grown on either Si or ZnO at 200 °C by pulsedlaser deposition in 10 mTorr of Ar. Sheet carrier concentration ns and mobility μ were measured at room temperature by the Hall effect and were fitted, respectively, to the equations ns(d) = n(∞)(d - δd) and μ(d) = μ(∞)/[1 +…
Photoluminescence (PL) and excitation spectra of Bi melt-doped oxide and chalcogenide glasses are very similar, indicating the same Bi center is present. When implanted with Bi, chalcogenide, phosphate and silica glasses, and BaF2 crystals, all display characteristically different PL spectra to when Bi is incorporated…
We summarized our recent studies on the optical properties of SrTiO3 single crystals and LaAlO3/SrTiO3 (LAO/STO) heterostructures using time-resolved photoluminescence (PL) and transient absorption (TA) measurements at low temperatures. We observed sharp band-edge PL peaks both in electron-doped SrTi1-xNbxO3 and LAO/S…
We propose a SnOx | Ag | SnOx multilayer, deposited in a continuous vacuum atmosphere by E-beam evaporation, as transparent anode for a (poly-3-hexylthiophene):[6,6]-phenyl-C61-butyric acid methyl ester (P3HT:PCBM) bulk heterojunction based Organic Solar Cell (OSC). Optical characterization of the deposited SnOx is pe…
To improve light absorption, previously various antireflection material layers were created on solar wafer surface including multilayer dielectric film, nanoparticle sludges, microtextures, noble metal plasmonic nanoparticles and 3D silicon nanostructure arrays. All of these approaches involve nanoscale prepatterning,…
Functionalization of small, rod like organic molecules can be used to optimize organic devices. Here we report on nanofiber formation and thin film growth of a methoxy-functionalized para-quaterphenylene (1,4'''-Dimethoxy- 4,1':4',1'':4'',1'''-quaterphenylene, MOP4) on prototypical dielectric substrates such as muscov…
All optical switching (AOS) applications require materials with a large nonlinear refractive index (n2) but relatively small linear and nonlinear absorption loss. The figure-of-merit (FOM), defined as the ratio between the real and imaginary parts of the second hyperpolarizability (γ), is widely used to evaluate the o…
Radiation delivery is required for various applications—mainly in medicine or industry. Due to the necessity of delivering IR, UV or powerful radiation, its transfer by hollow waveguides was investigated because standard glass fibers cause serious losses. Our special waveguide was based on a fused silica glass capilla…