161,214 research outputs found
Enhanced light backscattering in thermally poled plasmonic nanocomposite and its application to vapour sensing
No full textWe show theoretically that gold nanoparticles embedded in glass can exhibit enhanced light backscattering in presence of leaky waveguide and report on selective vapour sensing in thermally poled nanocomposite in which this concept is implemented
Laser assisted modification of poled silver-doped nanocomposite soda-lime glass
No full textThermal poling assisted homogenization of polydisperse Ag nanoparticles embedded in the soda-lime glass is demonstrated. The homogenization leads to the narrowing of the localized surface plasmon resonance. The subsequent irradiation with linearly polarized ultrashort laser pulses induces spectrally defined and three times larger dichroism than in non-poled sample
Leaky-modes excitation in thermally poled nanocomposite glass and their exploitation for saturable absorption
Full text linkThermal poling is used to create a reduced index layer in a soda-lime/nanocomposite film. Leaky-modes have been exploited to enhance interaction of light with Au-nanoparticles and demonstrate saturable absorption characteristics in line with state-of-the-art technology
Second-order nonlinearity profile in thermally poled twin-hole fibre
No full textThe second-order nonlinearity profile in thermally poled twin-hole fibre was characterized by second-harmonic scanning optical microscopy. The technique enabled us to optimize the poling parameters in order to obtain overlap between non-linear region and core
Enhanced stability of the second-order optical nonlinearity in poled glasses
Full text linkGlasses in a wide range of chemical composition were thermally poled and the stability of the second-order optical nonlinearity induced was studied through isothermal annealing experiments. Enhanced stability was found in aluminosilicate and aluminoborosilicate with respect to silica (at least a five order of magnitude increase in lifetime). Such dramatic enhancement was explained by the strong decrease of the alkali ion mobility due to specific changes in glass composition
Practical technique for measurement of second-order nonlinearity in poled glass
No full textA simple and nondestructive technique for measuring the thickness of the nonlinear optical layer in thermally poled glass, providing a minimum measurable thickness of 4 and 1µm resolution, is demonstrated. This technique is generally applicable to other nonlinear optical layers as well
Practical technique for measurements of second-order nonlinearities in thermally poled glasses
No full textPoled glass is an attractive material for nonlinear optics applications. In particular devices such as wavelength converters and switches can be straightforwardly integrated in the present optical telecommunications. Several glass systems have been tested so far in order to find one in which is possible to induce high second-order nonlinearities, but discrepancies in the values of χ(2) reported in point out that a reliable and practical technique is essential. Reliable χ(2) measurements requires accuracy in the measurement of the thickness of the induced nonlinearity (L ~ 10 µm)
Stability of the second-order optical nonlinearity in poled glasses
No full textSilicate glasses, in a wide composition range of glass host and dopants, were thermally poled and then isothermally annealed at 200° on glass material composition was observed
Second-order optical nonlinearity induced in high-index bismuthate glass by thermal poling
No full textSecond-order optical nonlinearity was induced in Bi content was increased from 6.25 mol% to 25.0 mol%. The formation of the nonlinearity was found to depend critically on poling temperature and time, sample thickness and glass-electrode contact
2pm/V in poled Bismuth-Zinc-Borate high index glass
Full text linkThermal poling freezes an intense static electric field (Edc) in glass resulting in a permanent second-order nonlinearity via a rectification process: χ(2) = 3χ(3)Edc. The low third-order nonlinearity limits the χ(2) of silica glass to 0.7 pm/V. Hence, poling of high χ(3) glasses offers an attractive route towards glass based integrated electro-optical modulators and frequency converters for which χ(2) of the order of 5 pm/V or higher would be desirabl
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