By Peter W. Hawkes (Ed.)

ISBN-10: 0120147459

ISBN-13: 9780120147458

**Advances in Imaging and Electron Physics merges long-running serials-- Advances in Electronics and Electron Physics and Advances in Optical & Electron Microscopy . The sequence good points prolonged articles at the physics of electron units (especially semiconductor devices), particle optics at low and high energies, microlithography, photograph technology and electronic picture processing, electromagnetic wave propagation, electron microscopy, and the computing equipment utilized in these kinds of domain names.
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**Read or Download Advances in Imaging and Electron Physics, Vol. 103 PDF**

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**Extra info for Advances in Imaging and Electron Physics, Vol. 103**

**Example text**

This last subject will be considered in Section VI. 32 EHUD HEYMAN AND TIMOR MELAMED A x1,2 I1 FIGURE10. Pulsed beam in a uniform medium. The drawing depicts a cross section in the principal plane ( x j , z). T. D j . R j and (YR, denote the pulselength, beamwidth, wavefront curvature, and collimation distance, respectively. Note that D j >> cT [see (96)l. The lines y = const. are the propagation lines [see discussion in connection with (83)l. The thick line in the z = 0 plane represents the rigorous source distribution for the globally exact complex source pulsed beam [30].

1e1> + 20 EHUD HEYMAN AND TIMOR MELAMED The analytic signal representation in (30)-(3 1) incorporates both the propagating and the evanescent spectra in a single analytic framework. The real field is then obtained from the real part of (31). It might be useful, however, to express (30)-(31) directly in terms of the real data UO(XO,t). z). One route to calculate this evanescent spectrum is through the frequency domain: The data UO(XO, r ) are first transformedto i o ( x 0 , w ) for all XO; then the plane-wave spectrum w ) is calculated via (3a) for all o, and finally it is transformed via (29) into GO(<, t ) with complex t.

As discussed in (98), a~ is the (frequency-independent)collimation (or diffraction) distance. The width of the distribution is given by Do of (99), and thus changes with frequency like w - ' / ~(see Fig. 13). 2 = a ~ Thus, . z. - .... ,.... -__ - .. -... p l , . -2 , ,,, -. - ___ _-_. -----------; , . -. - IF i'p -- . __. ~ .. , __ - . 15 ~ _ 2. FIGURE 13. Radiation from an ultrawideband isodiffracting aperture with a Fresnel distance F . The figure depicts the beamwidth in the ( p . z) plane at three frequencies: 01.

### Advances in Imaging and Electron Physics, Vol. 103 by Peter W. Hawkes (Ed.)

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