Glasses are important materials for novel technologies, as their properties can be tailored by doping and compositional changes. Furthermore, glasses can also be microstructured, making them interesting for optical and photonic applications. Corning Gorilla Glass is an alkali aluminosilicate glass commonly used as protective layer in smart phones and tablets thanks to its outstanding mechanical properties. Recently, it has been demonstrated the use of femtosecond direct laser writing of waveguides in Gorilla Glass, prompting it for integrated photonic/electronic devices. Therefore, it is important to study the nonlinear optical properties of Gorilla Glass as well as their laser-inscribed waveguides, since the effects of the laser writing process on the nonlinearity are not totally understood.
Here we investigate the third-order nonlinear optical properties of waveguides fs-pulses written waveguides in Gorilla Glass, by using the Dispersive-scan (D-scan) method. The nonlinear refractive index measured in the waveguide is lower than the one for the pristine material and its value depends on the writing pulse energy. For waveguides fabricated with pulse energy of 250 nJ, for instance, n2 is about three times lower than the one for the pristine sample. Micro Raman measurements were performed in the microstructured material in order to better understand the mechanisms of laser modification. Raman spectroscopy revealed the reduction and broadening of the high-frequency band related to non-bridging oxygens, which can explain the decrease of n2. Therefore, our results not only show the potential of using D-scan for waveguides nonlinear characterization, but also demonstrate and interpret the decrease of the nonlinear index of refraction in fs-laser micromachined waveguides in Gorilla Glass, which potential implications for photonic devices.
The use of cellulose as a platform for flexible electronics has appeared as an interesting approach for the development of new technologies, given its unique properties. Usually, printed paper-based electronics have been carried out by standard printing methods such as, for example, screen and inkjet printing. However, since some materials of interest are insoluble, the use of such approaches is limited to soluble materials. This is the case of poly(p-phenylene vinylene) (PPV), a material that presents attractive electrical, photo-luminescent and electro-luminescent properties. In this work we demonstrate the use of femtosecond laser induced forward transfer to produce high-resolution patterns of the conductive polymer PPV onto bacterial cellulose substrate, aiming at obtaining a new approach for the development of cellulose-based structure for flexible electronics. With such approach one were able to transfer PPV, with line resolution of about 10 µm and without materials degradation. Furthermore, to increase the electrical conductivity the samples were subsequently doped being then exploited in the fabrication of functional devices. These results open new avenues in the fabrication of paper-based devices, by combining high resolution and new classes of patterning materials.
We report on third-harmonic generation (THG) in optical materials using femtosecond pulses and Z-scan method. Here
we have played with beam focusing parameters and, in this way, we could track the THG signal at function of Rayleigh
ranges. We observed that the femtosecond pulse has broadband spectrum and such property also affects the thirdharmonic
(TH) spectrum. In this experiment we were able to distinguish the contribution of bulk and interface on the
THG by measuring the intensity and spectral profile of the TH signal.
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