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Title: Performance parameters for highly-focused electromagnetic waves
Authors: Sheppard, C.J.R. 
Balla, N.K.
Rehman, S. 
Issue Date: 1-Mar-2009
Source: Sheppard, C.J.R., Balla, N.K., Rehman, S. (2009-03-01). Performance parameters for highly-focused electromagnetic waves. Optics Communications 282 (5) : 727-734. ScholarBank@NUS Repository.
Abstract: New performance parameters are presented for electromagnetic focusing systems of high numerical aperture. The field in the focal region is expanded into either electric/magnetic dipole components, or transverse electric/magnetic components. The treatments can be applied to the important case of electric dipole waves, where the focused polarization distribution is the same as that of an electric dipole. For the limiting case of a system of unity numerical aperture, the transverse focus for a focused electric dipole field is sharpened up by 19% compared with an aplanatic system with plane-polarized input, while at the same time the focal intensity for a given input power is increased by 17%. This should be contrasted with using a pupil filter, in which case, as the focal spot is made smaller the focal intensity also decreases. Pure TE polarization results in an even smaller central lobe. Other inhomogeneous polarizations can also be investigated as linear combinations of electric/magnetic or TE/TM components. © 2008 Elsevier B.V. All rights reserved.
Source Title: Optics Communications
ISSN: 00304018
DOI: 10.1016/j.optcom.2008.11.021
Appears in Collections:Staff Publications

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