Diffraction Gratings, Ruled and Holographic

Loewen, Erwin G.

doi:10.1016/b978-0-12-408609-8.50008-2

Cited by 11 publications

(3 citation statements)

References 23 publications

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“…The control of an electromagnetic wave for retrodirective reflection has gained lot of interest recently for various applications. Retro-reflection 19 , can be obtained from diffraction in blazed grating 20,21,22 , such as in a Littrow configuration 23 . More recently, flat metaldielectric surfaces for retro-reflection or more generally for anomalous reflection 2 , have been designed based on generalized phase law 24 and reflect-array approach 25 .…”

Section: Introductionmentioning

confidence: 99%

Multiangle retrodirective cascaded metasurface

Kalaagi¹,

Seetharamdoo²

2019

Journal of Applied Physics

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In this paper a cascaded retrodirective metasurface is designed and demonstrated to operate simultaneously at a wide range of incident angles between -30 • to -10 • and 10 • to 30 • . It is based on the design of several retrodirective super-cells following the generalized Snell's law of reflection, where each super-cell is designed to redirect an incoming wave back in the same direction with high efficiency. This metasurface is a very good candidate as a retroreflector for radar cross-section enhancement of targets with poor backscattering. Retrodirective topologies have been a subject of interest and several engineered topologies exist such as the corner dihedral. Despite their good performances at a range of incident angles, their 3-dimensional bulky structure make them hard to implement for different applications and they do not address extreme incident angles. The metasurface proposed can be a complementary solution to existing topologies for addressing extreme oblique incident angles while being more compact due to its two dimensional (2D) subwavelength structure design. The monostatic RCS performance of the designed metasurface of dimensions 8.163 cm × 56.23 cm has been compared to that of a conventional corner dihedral of dimensions 8 cm × 15.5cm × 7.75 cm, a gain up to 50 dB of monostatic radar cross section (RCS) in the ranges -30 • to -20 • and 20 • to 30 • was obtained. Comparable performances are observed in the ranges -20 • to -10 • and 10 • to 20 • between the designed metasurface and the corner dihedral. Experimental results are shown to be in good agreement with simulation results.

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Section: Introductionmentioning

confidence: 99%

Multiangle retrodirective cascaded metasurface

Kalaagi¹,

Seetharamdoo²

2019

Journal of Applied Physics

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“…The aim is to make correlations for the choice of the optical components of spectrophotometer when the light intensity, range of scanning, resolution and condition for compact construction are known [2,3,4]. The concrete aim is to situate the optical components and to define the correlation of their parameters.…”

Section: Introductionmentioning

confidence: 99%

Optical Scheme for Spectrophotometer

Getzov¹,

Stoyanov²,

Zhekov³

2014

JSAR

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The work is about the design and development of compact optical system for spectrophotometer. The equation of plain diffraction grating allows the design of a compact appliance with optimal combination of the separate optical elements and their parameters. There are certain constructions of spectral appliances, which are developed by leading companies. The path of the rays is used, it is reflected by mirrors many times and the result is a compact construction. There are company catalogues for the choice of separate optical elements when developing appliances, but they do not describe the elements in detail. These facts do not allow scientific research and experimental construction on a high scientific and technical level with own recourses and materials.

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“…In the last two decades the development of rigorous electromagnetic theories, taking into account finite conductivity of the metal coating, has been intensively used for investigation of diffraction efficiency behavior of both ruled and holographic gratings. '- 3 The properties of gratings with various groove shape, such as sinusoidal, triangular, and lamellar ones, generally are well-established now over a wide spectral region.…”

Section: Introductionmentioning

confidence: 99%