By Christos Flytzanis (auth.), A. Miller, K. R. Welford, B. Daino (eds.)
Nonlinear Optical fabrics and units for purposes in info Technology takes the reader from primary interactions of laser mild in fabrics to the newest advancements of electronic optical info processing. The publication emphasises nonlinear optical interactions in bulk and low-dimensional semiconductors, liquid crystals and optical fibres. After setting up the fundamental laser--material interactions in those fabrics, it is going directly to determine functions in soliton propagation, built-in optics, clever pixel arrays and electronic optical computing.
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Additional info for Nonlinear Optical Materials and Devices for Applications in Information Technology
The number of the independent tensor components, there at most 3n+l such components, can be substantially reduced if the material system possess a symmetry ; the even order polarization response functions R(2n) identically vanish for systems with inversion symmetry. The temporal profit of E('t) can be arbitrary but in the impulsive regime, with delta-like pulses, it is easily seen that each polarization term coincides with the corresponding polarization function. By introducing the Fourier representation in frequency space for the polarization and field the previous relation become algebraic.
An indication of how such a relation can be handled could be obtained by working out a specific quantum or classical model say the two levels model or the anharmonic oscillator. The problem of nonlinear K-K relations is also related(47) to the efforts to set up a thermodynamic approach and formally derive the susceptibility from a postulated "free energy". This too encounters difficulties however when the physical interpretation is attempted since the stationarity and equilibrium condition must be properly formulated.
This microscopic description clearly must be compatible with the phenomenological one we outlined in the previous section ; it is based on the equation of charge motion in the presence of intense coherent electromagnetic fields and the interactions with the other charges. Because of the complexity of the problem the steps(9) that lead from this equation to the expressions of the experimentally accessible macroscopic nonlinear susceptibilities previously introduced are several and all involve certain simplifications and approximations in order to cope with the many-body interactions and obtain meaningful and useful informations.
Nonlinear Optical Materials and Devices for Applications in Information Technology by Christos Flytzanis (auth.), A. Miller, K. R. Welford, B. Daino (eds.)