57 research outputs found
Rigorous diffraction theory of optical reflection and transmission gratings
No full textElectrical Engineering, Mathematics and Computer Scienc
Seismic inversion by a RMS born approximation in the space-time domain Inversion sismique par une approximation generee par methode RMS dans un domaine espace-temps
No full textA bound for the range of a narrow light beam in the near field
No full textWe investigate the possibility of light beams that are both narrow and long range with respect to the wavelength. On the basis of spectral electromagnetic field representations, we have studied the decay of the evanescent waves, and we have obtained some bounds for the width and range of a light beam in the near-field region. The range determines the spatial bound of the near field in the direction of propagation. For a number of representative examples we found that narrow beams have a short range. Our analysis is based on the uncertainty relations between spatial position and spatial frequency.IST/Imaging Science and TechnologyApplied Science
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