Diffraction-resistant scalar beams generated by a parabolic reflector and a source of spherical waves

Abstract

In this work, we propose the generation of diffraction-resistant beams by using a parabolic reflector and a source of spherical waves positioned at a point slightly displaced from its focus (away from the reflector). In our analysis, considering the reflector dimensions much greater than the wavelength, we describe the main characteristics of the resulting beams, showing their properties of resistance to the diffraction effects. Due to its simplicity, this method may be an interesting alternative for the generation of long-range diffraction-resistant waves.

Analysis of limited-diffractive and limited-dispersive X-waves generated by finite radial waveguides

“…(15) and (16), thus Eq. (17) and its related Fig.1 can still be used as references. In particular, for narrow bandwidths, the spot widths of a dispersive X-wave coincide with those of an ideal X-wave, and thus Fig.…”

“…The earlier works on nondiffractive beams, and in particular on Bessel beams [3,4], paved the way for the realization of optical devices [5] able to generate a nondiffractive intensity profile over a considerable depth of field. In optics, as well as at lower frequencies, different methods have been proposed for generating Bessel beams [6][7][8][9][10][11][12][13][14][15][16][17] (for a review, see, e.g., [18,19]). The works at millimeter waves [11][12][13][14][15][16] are of particular interest since they avoid the ray-optics approximation used at optical frequencies, which limits the analysis of Bessel beams to those with a spot size much larger than the operating wavelength [20].…”

Çizgisel Kaynak ile Odak Dışı Beslenen Bir Parabolik Reflektörden Kırınan Alanlar

“…Suedan and Jull applied the complex source point technique to parabolic cylinder reflectors and offset parabolic reflector examples [10]. Diffraction-resistant beams are proposed by means of a parabolic reflector and a spherical wave source which is placed near the focus [11].…”