Irradiated samples of the three fused silica grades exhibit changes in the broad and asymmetric R-band (蠅_1 around 445 cm~(-1)), in D1 (490 cm~(-1)) and D_2 (605 cm~(-1)) bands associated to small-membered rings. The D_2 band shows an increase with increasing fluences for ...
Pure and europium doped silica xerogels were annealed at 1050°C to obtain full densification, and at 1300°C to induce crystallization. Raman spectroscopy, time resolved selective luminescence and lifetime measurements were performed on glassy and crystallized samples. We discuss the differences between...
Recently, competing random lasing and stimulated Raman scattering mechanisms have been observed for the same gain medium infiltrated in diffusive silica-based solid foams. Specifically, the light transport mean free path in such disordered media has been identified to be a parameter of choice to tune...
which indicates that the present thermalinfusionmethod is effective to prepare highly dispersedmolybdenumoxide within the mesoporous silica spheres. After the hydration of Mo(VI)@mSiO2 with water, more
Raman Spectroscopy offers numerous advantages. Since Raman instruments use lasers in the visible region, flexible silica fiber optic cables can be used to excite the sample and collect the dispersed radiation, and these cables can be quite long if necessary. Since visible light is used, glass or...
which indicates that the present thermal infusion method is effective to prepare highly dispersed molybdenum oxide within the mesoporous silica spheres. After the hydration of MoVI@mSiO2 with water, more Raman peaks appeared due to restructuring of surface heptamolybdate species. The peaks at 998−...
Three red pigments r1, r2 and r3 were extracted and separated by means of MgO-Diatomaceous Earth(1:2,W/W) column and silica-gel G TLC from Potamogeton crispus L., the good separating solvent mixtures on the silica G TLC were:hexane-ethyl acetate-acetone-methanol=27:4:2:2 (v/v/v/v...
We report the observation of spontaneous and stimulated Raman scattering in a silica-cladded silicon photonic crystal (PhC) waveguide (WG) with modified holes. Spontaneous Raman scattering in the WG was enhanced when the Stokes wavelength was approached to the bandedge of a WG mode. A maximum en...
Raman-scattering noise in silica has been the key obstacle toward the realisation of high quality fiber-based photon-pair sources. Here, we experimentally demonstrate how to get past this limitation by dispersion tailoring a xenon-filled hollow-core photonic crystal fiber. The source operates at roo...
www.nature.com/scientificreports OPEN Surface-Enhanced Raman Scattering of Silicon Nanocrystals in a Silica Film received: 03 February 2016 accepted: 11 May 2016 Published: 03 June 2016 Sergei Novikov1 & Leonid Khriachtchev2 Surface-enhanced Raman scattering (SERS) is an intriguing effect, ...