Browsing by Author "Vieweg, Marius"

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Open Access
Linear refractive index and absorption measurements of nonlinear optical liquids in the visible and near-infrared spectral region
(2012) Kedenburg, Stefan; Vieweg, Marius; Gissibl, Timo; Giessen, Harald
Liquid-filled photonic crystal fibers and optofluidic devices require infiltration with a variety of liquids whose linear optical properties are still not well known over a broad spectral range, particularly in the near infrared. Hence, dispersion and absorption properties in the visible and near-infrared wavelength region have been determined for distilled water, heavy water, chloroform, carbon tetrachloride, toluene, ethanol, carbon disulfide, and nitrobenzene at a temperature of 20 °C. For the refractive index measurement a standard Abbe refractometer in combination with a white light laser and a technique to calculate correction terms to compensate for the dispersion of the glass prism has been used. New refractive index data and derived dispersion formulas between a wavelength of 500 nm and 1600 nm are presented in good agreement with sparsely existing reference data in this wavelength range. The absorption coefficient has been deduced from the difference of the losses of several identically prepared liquid filled glass cells or tubes of different lengths. We present absorption data in the wavelength region between 500 nm and 1750 nm.
Open Access
Nonlinear optics in selectively fluid-filled photonic crystal fibers
(2012) Vieweg, Marius; Giessen, Harald (Prof. Dr.)
Selective filling of photonic crystal fibers with different media enables a plethora of possibilities in linear and nonlinear optics. Using the two-photon direct laser writing technique we demonstrate full flexibility of individual closing and subsequent filling of photonic crystal fibers with highly nonlinear liquids. We experimentally demonstrate a solitonic supercontinuum generation over 600nm bandwidth using a compact femtosecond oscillator as pump source. A nonlinear optofluidic coupler is built based on the developed technique that shows power dependent switching and all-optical control of the output. This device utilizes the ultrafast Kerr nonlinearity and hence switching times below 1 ps are feasible. Exploiting the thermo-optical properties of the liquids, the coupler can be tuned externally in its switching characteristics by temperature. To demonstrate the capabilities of our fiber devices to spatially control the light, we present the formation of spatial solitons in a discrete optofluidic nonlinear waveguide array, entering the field of discrete optofluidics. Our work is fundamentally important to the field of nonlinear effects and underpins new applications in sensing and communication technology. Selective filling of various materials will be the basis of new reconfigurable and versatile optical devices with unprecedented performance. Our devices allow tailoring of the dispersion, spatial coupling and spatial arrangement of a waveguide array, as well as the optical nonlinearity in a two-dimensional discrete system. Thus complete control is given of the optical properties of these here presented devices.