Highly nonparaxial (1+1)-D subwavelength optical fields.
A general approach for describing (1+1)-D subwavelength optical field whose waist is much smaller than the wavelength is presented. Exploiting the vectorial Rayleigh-Sommerfeld diffraction theory, a suitable expansion in the ratio between the beam waist and the wavelength allows us to prove the a (1+1)D highly nonparaxial field is generally the product of a cylindrical wave carrier and an envelope which is angularly slowly varying. We apply our general approach to the case of highly nonparaxial Hermite-Gaussian beams whose description is fully analytical.
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Dipartimento di Ingegneria Elettrica e dell'Informazione, Università dell'Aquila 67100, Monteluco di Roio, Italy. carlo.rizza@aquila.infn.it
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