Fresnel axicon

Golub, Ilya

doi:10.1364/ol.31.001890

Cited by 72 publications

(33 citation statements)

References 24 publications

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“…Alternative concepts that bend light based on diffractive optics offer the possibility of thinner, lightweight form factors, with a relatively broad range of optical properties specified by the geometric design. One class of diffractive-based axicons utilizes continuous echelle profiles 9,10 [ Fig. 1(b)] or discrete multilayer blazed profiles 11,12 [ Fig.…”

confidence: 99%

High-performance axicon lenses based on high-contrast, multilayer gratings

et al. 2018

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Axicon lenses are versatile optical elements that can convert Gaussian beams to Bessel-like beams. In this letter, we demonstrate that axicons operating with high efficiencies and at large angles can be produced using high-contrast, multilayer gratings made from silicon. Efficient beam deflection of incident monochromatic light is enabled by higher-order optical modes in the silicon structure. Compared to diffractive devices made from low-contrast materials such as silicon dioxide, our multilayer devices have a relatively low spatial profile, reducing shadowing effects and enabling high efficiencies at large deflection angles. In addition, the feature sizes of these structures are relatively large, making the fabrication of near-infrared devices accessible with conventional optical lithography. Experimental lenses with deflection angles as large as 40° display field profiles that agree well with theory. Our concept can be used to design optical elements that produce higher-order Bessel-like beams, and the combination of high-contrast materials with multilayer architectures will more generally enable new classes of diffractive photonic structures.

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confidence: 99%

High-performance axicon lenses based on high-contrast, multilayer gratings

et al. 2018

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“…Accordingly, much interest has been provoked in design and analysis of axicons [10], and the number of axicon applications has also increased significantly in the last few years [11]. More recently many novel types of axicons, such as Fresnel axicons [12], Fractal axicons [13] and fractal conical lenses (FCLs) [14], have been proposed and investigated in optics. Moreover, these elements can also be used in quasi-optical or millimeter wave systems.…”

Section: Introductionmentioning

confidence: 99%

Properties of Approximate Bessel Beams at Millimeter Wavelengths Generated by Fractal Conical Lens

Yu¹,

Dou²

2008

PIER

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Abstract-An axicon, which images a point source into a line along the optic axis, is used widely to generate an approximation to a Bessel beam. More recently many novel axicons, such as Fresnel axicons, Fractal axicons and fractal conical lenses (FCLs), have been proposed. Understanding the properties of Bessel beams generated by these axicons is very helpful to research their applications. However, in optical region, all of them are calculated approximately by the scalar theory. To accurately analyze FCLs when illuminated by a plane wave at millimeter wavelengths, the rigorous electromagnetic analysis method, which combines a two-dimension finite-difference time-domain (2-D FDTD) method and Stratton-Chu formulas, is adopted in our paper. By using this method, the properties of approximate Bessel beams generated by FCLs are analyzed and the conclusions are given.

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“…Several configurations are proposed in the bibliography [1][2][3][4][5][6][7][8][9][10]. Some of them are based on single elements [1,2,4,[6][7][8][9]10] while others are based on convenient association of several elements [3,5,8]. Extended depth of focus in a single element is usually achieved by spatial multiplexing of phase information.…”

Section: Introductionmentioning

confidence: 99%

“…Extended depth of focus in a single element is usually achieved by spatial multiplexing of phase information. We can find elements in which focusing information is codified in radial [9,11] or angular coordinates [2] or even with random localization through the surface of the element [7]. All these elements share the common property that they produce a long and narrow focal segment which allows imaging in a continuous region in the image domain.…”

Section: Introductionmentioning

confidence: 99%

“…All these elements share the common property that they produce a long and narrow focal segment which allows imaging in a continuous region in the image domain. The effect can be achieved by multiplexing a continuous range of focalization distances in the element, which can be done either with refractive media [1,3,4,10] or by diffractive optical elements (DOEs) [2,6,7,9,12,13]. Among these systems, we are most interested in single diffractive structures, which can be easily implemented in a spatial light modulator (SLM).…”

Section: Introductionmentioning

confidence: 99%

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Three dimensional analysis of chromatic aberration in diffractive elements with extended depth of focus

Mas¹,

Espinosa²,

Pérez³

et al. 2007

Opt. Express

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Abstract:The paper presents the polychromatic analysis of two diffractive optical elements with extended depth of focus: the linear axicon and the light sword optical element. Chromatic aberration produces axial displacement of the focal segment line. Thus, we explore the possibility of extending the focal depth of these elements to permit superposition of the chromatic foci. In the case of an axicon, we achieve an achromatic zone where focusing is produced. In the case of the light sword element, we show that the focusing segment is out of axis. Therefore a superposition of colors is produced, but not on axis overlapping. Instead, three colored and separated foci are simultaneously obtained in a single plane. Three dimensional structures of the propagated beams are analyzed in order to provide better understanding of the properties and applications of such elements.

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Fresnel axicon

Cited by 72 publications

References 24 publications

High-performance axicon lenses based on high-contrast, multilayer gratings

High-performance axicon lenses based on high-contrast, multilayer gratings

Properties of Approximate Bessel Beams at Millimeter Wavelengths Generated by Fractal Conical Lens

Three dimensional analysis of chromatic aberration in diffractive elements with extended depth of focus

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