Download 3D Laser Microfabrication: Principles and Applications by Sami Franssila PDF

By Sami Franssila

A radical advent to 3D laser microfabrication expertise, top readers from the basics and thought to its quite a few powerful purposes, reminiscent of the iteration of tiny gadgets or 3-dimensional buildings in the bulk of obvious materials.The booklet additionally offers new theoretical fabric on dielectric breakdown, permitting a greater realizing of the diversities among optical harm on surfaces and contained in the bulk, in addition to a glance into the future.Chemists, physicists, fabrics scientists and engineers will locate this a necessary resource of interdisciplinary wisdom within the box of laser optics and nanotechnology.

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It should be noted that impact ionization requires the effective electron collision frequency and initial electron density, n0, to be relatively high. The number density of electrons generated by such an avalanche process reads: ne ¼ n0 2wimp t ¼ n0 eln 2Áwimp Át (26) It is generally accepted that breakdown occurs when the number density of electrons reaches the critical density corresponding to the frequency of the incident light nc ¼ me x2 =4p e2 . Thus, laser parameters, (intensity, wavelength, pulse duration) and material parameters (band-gap width and electron–phonon effective rate) at the breakdown threshold are combined by condition, ne = nc.

Irradiation for 5 s at 355 nm at a total fluence of 4 mJ cm–2 and for 60 s with two beams of 532 nm and 1064 nm at 20 mJ cm–2 was needed in order to produce a detectable structure. The essential feature of two-photon excitation – a quadratic dependence of the absorption on the laser intensity – ensures that the excited area is confined inside the focal volume. Two-photon excitation of fluorescence of a dye molecule was also used in [15]. 4 to a diffraction-limited waist of less than a micron in diameter.

29 M. Lenzner, J. Kruger, S. Sartania, Z. Cheng, Ch. Spielmann, G. Mourou, W. Kautek, and F. Krausz, Femtosecond optical breakdown in dielectrics, Phys. Rev. , 80, 4076–4079 (1998). 30 An-Chun Tien, S. Backus, H. Kapteyn, M. Murname, and G. Mourou, Shortpulse laser Damage in transparent materials as a function of Pulse duration, Phys. Rev. , 82, 3883–3886 (1999). 31 L. Sudrie, A. Couairon, M. Franko, B. Lamouroux, B. Prade, S. Tzortzakis and A. Mysyrovicz, Femtosecond laserInduced Damage and Filamentary Propa- 32 33 34 35 36 37 38 39 40 gation in Fused silica, Phys.

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