Print Email Facebook Twitter A bound for the range of a narrow light beam in the near field Title A bound for the range of a narrow light beam in the near field Author Verbeek, P.W. Van den Berg, P.M. Faculty Applied Sciences Department IST/Imaging Science and Technology Date 2011-09-29 Abstract We 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. Subject Fourier optics and signal processingphysical opticselectromagnetic opticswave propagation To reference this document use: http://resolver.tudelft.nl/uuid:acad9374-1d18-4dec-844b-79bcf13eacb2 DOI https://doi.org/10.1364/JOSAA.28.002176 Publisher Optical Society of America ISSN 1084-7529 Source http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-28-10-2176 Source Journal of the Optical Society of America A, 18 (10), 2011 Part of collection Institutional Repository Document type journal article Rights © 2011 Optical Society of America Files PDF Verbeek_2011.pdf 628.04 KB Close viewer /islandora/object/uuid:acad9374-1d18-4dec-844b-79bcf13eacb2/datastream/OBJ/view