This article presents the modeling and fabrication of photonic devices such as a Mach-Zehnder waveguide interferometer (MZWI) 1 × 4 optical power splitter (OPS) with microfluidic channel. The structures were designed using CAD software BeamPROPTM to have an s-shaped bend geometry total length 8000 μm, then integrated 6000 μm channel form configurations based on conical spirals helices femtosecond laser radiation. entire writing process was performed in single step 20X microscope objective...

Abstract Surface enhanced Raman spectroscopy (SERS) is becoming a paramount analytical mechanism in nanotechnology and biological/chemical detection. However, fabrication of highly sensitive SERS substrates often involves expensive time‐consuming procedures the resulting materials require careful handling. Herein, simple‐to‐manufacture, sensitive, easy‐to‐handle substrate enabled by plasmonic nanopaper decorated with graphene oxide flakes reported. Owing to physicochemical properties...

This work reports continuous laser oscillation at λ=1064.3 nm room temperature in Nd:YAG planar waveguides fabricated by two different techniques: proton implantation with a multi-implant of energies around 1 MeV and carbon single-implant an energy 7 MeV. Threshold powers 11 22 mW slope efficiencies 7% 9% were achieved the proton- carbon-implanted guides, respectively. The outputs show very high stability operating cw regime temperature.

This work reports continuous laser oscillation around 1.3μm at room temperature in Nd:YAG planar waveguides fabricated by MeV proton implantation. The performance of the waveguide lasers with different implantation parameters has been studied terms threshold pump powers and slope efficiencies. These results have compared those obtained operating a wavelength 1.06μm, taking into account emission cross-sectional values F3∕24→I11∕24 F3∕24→I13∕24 transitions.

In this work the formation of optical channel waveguides in Nd:YAG crystals by either proton or carbon implantation is reported. The were obtained a single process through an electroformed mask nickel-cobalt alloy. Experimental measurements properties these are presented.

Step-index optical waveguides have been obtained by means of silver ion implantation on fused silica substrates. Step index profiles reached using a sequential multiple process with energies from 4.3 to 9 MeV and fluences 10 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">14</sup> -10 xmlns:xlink="http://www.w3.org/1999/xlink">15</sup> ions/cm xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> . Optical absorption spectra, propagation losses,...

Luminescence offers a sensitive probe of the quality Nd:YAG laser material both in bulk and, via cathodoluminescence, near surface layers. The spectral signals are primarily from Nd dopants, but thermoluminescence spectra reveal traces impurities such as Tb, Cr and Mn. Control electron energy cathodoluminescence demonstrates that outer few micron layers differ significantly luminescence response crystal. influenced by dislocations solvents cleaning treatments. effects often apparent...

Abstract Cathodoluminescence (CL) provides a sensitive analytical probe of the near-surface region insulating materials, and some new examples strengths technique are presented using recent data from University Sussex. Analysis float glass shows that by spectral lifetime resolved it is possible to separate emission bands excitonic, intrinsic imperfections, impurities in various valence states, as function their depth beneath surface. Correlation CL with those Mössbauer, ion beam other...

A whole silicon monolithic waveguide-detector system is studied. Four different coupling electrophotonic devices are presented. One of them analyzed in detail. The studied consists a planar p-n junction with waveguide built cavity front it. output port the faces directly to depleted layer maximizing absorbance all photons. experimentally fabricated and characterized, light on visible range transmitted multimode. simulation fabrication process considers an N-type substrate, whose resistivity...

High sensitivity represents one of the main goals that sensing devices need to satisfy for their applications. This work presents best our knowledge first integrated Mach-Zehnder interferometer (MZI) embedded in soda-lime glass with comparable silicon-on-insulator (SOI) devices. We manufactured MZIs by femtosecond direct laser writing (FDLW) technique and characterized them temperature. Four buried were slightly increasing optical path due separation between arms (Δs). achieved a fringe...

This work presents the results by irradiating fresh Portland cement pastes with CO2 laser, at powers of 1.6, 2.0, and 2.4 W, different water-to-cement (w/c) ratios 0.4, 0.45, 0.5. Raman spectra show evolution accelerated growth main hydration products through intensity changes signal. The shifts reveal that C-S-H, CH, AFt, CaCO3 bands are detected in a shorter time, which means setting times also reduced. band calcium carbonate, is due to incorporation limestone during grinding process,...

Abstract This work reports the formation of planar and channel waveguides in Nd:YVO4 by carbon implantation, using doses as low 5 × 1014 ions/cm2. The analysis includes refractive index profiles, propagation losses spectroscopic properties. results indicate that there is an convergence, ordinary increases while extraordinary decreases. studies show emission bands coming from 4F3/2 level are not altered ion beam process, shedding light on potential implanted for laser integrated devices....

The performance of lasers based on channel waveguides produced by proton implantation in Nd:YAG crystals through an electroformed mask is reported. fabrication method used can produce several waveguide the crystal a single process with very good optical performance. analysis and comparison main laser emission features, as well propagation losses these waveguides, using different output couplers cavity also presented.

In this work, a nondestructive and noninvasive technique, based on laser technology the use of Kubelka-Munk model to calculate dynamic behavior cement paste from diffuse reflection properties both components hydration products, is proposed. Also, Powers-Brunauer used explain during first 9 h process. This method allows us obtain initial final setting times measurements.