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Femtosecond Pulse Coupling to Near-Field Cantilevered Probes
M. Labardi,D. Polli,G. Cerullo,M. Allegrini,M. Zavelani-Rossi,O. Svelto,S. De Silvestri 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.1
A novel nanoprobe for space- and time-resolved nonlinear optical spectroscopy has been developed. The nanoprobe is based on aperture-type SNOM using cantilevered sensors (“SNOM cantilevers”), capable to couple much higher power to the sample as compared to usual tapered fiber probes, along with negligible effect on femtosecond pulse duration, as directly assessed by secondorder fringe-resolved autocorrelation in the near field. The use of such nanosource for pump-probe near-field spectroscopy promises to improve both time and space resolution with respect to the current state-of-the-art setups.
P. G. Gucciardi,R. Micheletto,M. Allegrini,T. Kotani,T. Hatada,Y. Kawakami 한국물리학회 2005 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.47 No.1
Distributed Bragg Reflectors (DBRs) have been found to be very effective in increasing the efficiency of light emitting diodes and semiconductor laser devices. By using polarization-modulated scanning near-field optical microscopy (PM-SNOM), we investigate the optical response to different illumination polarization states of a DBR structure that consists of a stack of quarter wavelength thick slabs of dielectrics with alternating high and low refractive index. The DBR has been optically characterized in the near-field at different wavelengths in illumination- and in collection- mode with light excitation orthogonal to the probe axis, for fixed as well as for modulated polarization. We have found that the optical signal does not follow the morphological structure of the slabs, as expected but it shows a different spatial periodicity related to the excitation properties and to the interplay of the different DBR planes.
G. Lazzini,L. Gemini,A. H. A. Lutey,R. Kling,L. Romoli,M. Allegrini,F. Fuso 한국정밀공학회 2019 International Journal of Precision Engineering and Vol.20 No.9
Stainless-steel is ablated with femtosecond laser pulses at high repetition rate. A multi-pass, high spatial overlap laser scanning strategy is applied in order to cope with the requirements for large-scale machining of high aspect ratio structures. Topography of the processed surfaces is analyzed via Shear Force Microscopy scans, with the main aim to investigate morphology changes as a function of process parameters. Quantitative assessment of local height variations enables a detailed investigation of the produced features. Depending on the process parameters, in particular on laser fluence and repetition rate, a transition from small islands to large bumps is observed, explained in terms of feature coalescence.