Nanoscience: Nanotechnologies and Nanophysics by Claire Dupas, Marcel Lahmani

By Claire Dupas, Marcel Lahmani

Nanotechnologies and nanosciences are a fast-developing box of analysis, which sit down on the element of convergence of numerous disciplines (physics, chemistry, biology, mechanics, etc.). This practically-oriented review is designed to supply scholars and researchers with crucial info on either the instruments of manufacture and particular positive aspects of the nanometric scale, in addition to purposes in the so much energetic fields (electronics, magnetism, info garage, biology). particular purposes and strategies coated contain nanolithography, STM and AFM, nanowires and supramolecules, molecular electronics, optronics, and simulation. each one part of the publication devotes huge house to business functions and potential developments.

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5 µm in production processes. Over the years, wavelength reduction has proved an efficient way of enhancing resolution. The 193 nm ArF excimer lasers currently in use have replaced the mercury I line (365 nm) preferred in the 1990s. Production lines using 157 nm F2 lasers are currently under study and planned for fabrication of devices with minimal dimensions of 65 nm in 2005. One delicate problem associated with wavelength reduction is absorption in glass. This leads to significant heating effects in the optics, highly complex systems involving a large number of components which must be aligned with great accuracy.

However, in this case, the light is collected only in the far field and one is therefore dealing with Fraunhofer diffraction. , the theory of plane waves, is applicable. The diffraction pattern is calculated by summing at each point of the image plane the contributions from all wave fronts coming from the diffracting object, taking into account the path length difference in each light path. A very important parameter arises when a lens is used, namely, the aperture. Indeed, diffracted waves make an angle with the optical axis which increases with the order of diffraction.

It is quite clear that, although electrolytic growth is possible within such small features, the pillars produced in this way do not all have the same height. Some are very small, while others reach the total thickness of the resist (300 nm in this example), and still others have grown much more quickly and ended up overflowing the resist mould to produce a kind of mushroom formation at the top (see Fig. 12). However, it remains true that the technique is capable of depositing thick layers in nanometric features.

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