Materials Literature
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The optical quality of semipolar (1 101)GaN layers was explored by time- and polarization-resolved photoluminescence spectroscopy. High intensity bandedge emission was observed in +c-wing regions of the stripes as a result of better structural quality, while -c-wing regions were found to be of poorer optical quality d…
Imaging in long wavelength regimes holds huge potential in many fields, from security to skin cancer detection. However, it is often difficult to image at these frequencies – the so called ‘THz gap1’ is no exception. Current techniques generally involve mechanically raster scanning a single detector to gain spatial in…
ZnGa2O4 (ZGO) is a normal spinel. When doped with Cr3+ ions, ZGO:Cr becomes a high brightness persistent luminescence material with an emission spectrum perfectly matching the transparency window of living tissues. It allows in vivo mouse imaging with a better signal to background ratio than classical fluorescent NIR…
Our paper presents a detailed numerical simulation and experimental study of the efficiency enhancement gained by optimizing metal nanocubes incorporated on the surface of silicon solar cells. We investigate the effects of nanoparticle size, surface coverage and spacer layer thickness on solar absorption and cell effi…
Gratings with binary and blazed profiles and periods in the low micron and sub-micron range define a class of microstructures with a huge application potential. We present a mask based photolithographic fabrication method for these demanding grating geometries. It combines the advantages of electron beam lithography a…
Crystalline lanthanum aluminate (LAO) films were grown epitaxially on SrTiO3(001) and on Si(001) with a buffer layer of four unit cells of SrTiO3 by atomic layer deposition. The SrTiO3 buffer layer was grown by molecular beam epitaxy. Tris(N,N’-diisopropylformamidinate)-lanthanum, trimethylaluminum, and water as co-re…
Femtosecond (fs) laser generation of submicron bubbles around plasmonic nanoparticles (NPs) plays a key role in advanced laser nanosurgery applications such as cell membrane perforation and cell transfection. In this context, we have developed a pump-probe shadowgraphic ultrafast imaging technique capable of tracking…
The blending of metallic nanoparticles into the active layer of organic solar cells in a bid to enhance their light absorption and device performance has led to controversial reports of both efficiency enhancement and degradation. Herein, through comprehensive transient absorption spectroscopy, we present clear eviden…
Carbon nanowalls (CNWs), which are three-dimensional carbon nanomaterials consisting of stacks of graphene sheets vertically standing on substrates, possess a mazelike architecture containing high-density graphene edges and large-area plane surfaces. A selective morphological modification technique for the surfaces of…
The pulsed laser deposition (PLD) growth processes of spinel lithium titanates, Li4Ti5O12 and LiTi2O4, on MgAl2O4 (111) substrates are investigated. Although a Li4Ti5O12 target was used for the depositions, the Li/Ti atomic ratio of the species arriving at the substrate during deposition was only ~0.5, enabling high q…
In the present paper, optical absorption and emission spectra and luminescence decay lifetimes of different concentrations, 0.1, 0.3, 0.5, 0.7 and 1.0 mol% of Er3+ and 0.1Er3+/0.5Yb3+ co-doped tellurite glasses (TeO2-Bi2O3-ZnONb2O5) were reported. Judd-Ofelt intensity parameters were determined and used to calculate s…
The transformation-induced plasticity (TRIP) effect is examined at high strain rate of over 104 s−1 compression during adiabatic shear band (ASB) formation to determine whether the TRIP effect proceeds smoothly and whether it can restrain ASB formation. Results show two distinct stages of TRIP during dynamic straining…
This study reports the preparation of a novel biomaterial from a forestry residue - Xanthoceras sorbifolia shell (XSS) - by solvent modification. The effects of acid and base (hydrochloric acerbic, acetic acid, sodium hydroxide, ammonia water) and some organic solvents (ethanol, acetone, ethyl acetate, chloroform, pet…
Laser based displays, such as 10 lm to 70K lm laser projectors and laser diode (LD) backlight liquid crystal display (LCD) TVs, have attracted much attention because of the large gamut, low power consumption, and so on. Laser light sources for the displays are operated mainly under CW, and requested to be highly relia…
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…