Quasi-optical techniques

Goldsmith, Paul F.

doi:10.1109/5.175252

Cited by 150 publications

(107 citation statements)

References 174 publications

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“…This required the fabricated surface to be 226 mm Â 226 mm to capture 99.9% of the incident power [27]. A section of the fabricated Huygens' surface is shown in Fig.…”

Section: -2mentioning

confidence: 99%

Wave-Shaping Surfaces

Alù¹

2013

Physics

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Huygens' principle is a well-known concept in electromagnetics that dates back to 1690. Here, it is applied to develop designer surfaces that provide extreme control of electromagnetic wave fronts across electrically thin layers. These reflectionless surfaces, referred to as metamaterial Huygens' surfaces, provide new beam shaping, steering, and focusing capabilities. The metamaterial Huygens' surfaces are realized with two-dimensional arrays of polarizable particles that provide both electric and magnetic polarization currents to generate prescribed wave fronts. A straightforward design methodology is demonstrated and applied to develop a beam-refracting surface and a Gaussian-to-Bessel beam transformer. Metamaterial Huygens' surfaces could find a wide range of applications over the entire electromagnetic spectrum including single-surface lenses, polarization controlling devices, stealth technologies, and perfect absorbers.

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“…This required the fabricated surface to be 226 mm Â 226 mm to capture 99.9% of the incident power [27]. A section of the fabricated Huygens' surface is shown in Fig.…”

Section: -2mentioning

confidence: 99%

Wave-Shaping Surfaces

Alù¹

2013

Physics

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“…The on-axis beam from each of the telescopes can be approximated as a Gaussian [16] with beam width w that varies with propagation distance z, as shown in (1).…”

Section: Optimising Baseline Telescope Designmentioning

confidence: 99%

Quasi-optical analysis of a far-infrared spatio-spectral space interferometer concept

Bracken

O'Sullivan

Murphy

et al. 2016

Infrared Physics & Technology

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FISICA (Far-Infrared Space Interferometer Critical Assessment) was a three year study aimed at designing a far-infrared spatio-spectral double-Fourier interferometer concept. This paper describes a two-telescope (and hub) baseline optical design, that fulfills the requirements of the FISICA science case. Due the physical size of far-infrared wavelengths with respect to the size of the required optics, a number of different analysis techniques were required for the design work. Approximate simulation tools such as ray tracing and Gaussian beam mode (GBM) methods were employed for initial analysis, with GRASP PO (physical optics) used for final analysis for higher accuracy. The work builds on previous far-infrared double

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“…1(a) is Gaussian beam width (the 2 thinner solid curves) in free space for a 161 GHz wave launched from d=3 cm diameter waveguide antenna located at R=8.4978 m where the wall is. The half-width of the waist is assumed w 0 =0.96 cm (=0.32*d) for optimal coupling of launch and receive of the HE11 mode with a corrugated waveguide antenna [12]. The LCFS is shown as the thicker vertical line for ITER H-mode Scenario 2 plasma configuration.…”

Section: Description Of the Analysis Methodsmentioning

confidence: 99%

Refractive and relativistic effects on ITER low field side reflectometer design

Wang

Rhodes

Peebles

et al. 2010

Review of Scientific Instruments

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(Presented XXXXX; received XXXXX; accepted XXXXX; published online XXXXX) (Dates appearing here are provided by the Editorial Office) The ITER low field side reflectometer faces some unique design challenges, among which are included the effect of relativistic electron temperatures and refraction of probing waves. This paper utilizes GENRAY, a 3-D ray tracing code, to investigate these effects. Using a simulated ITER operating scenario, characteristics of the reflected RF waves returning to the launch plane are quantified as a function of a range of design parameters, including antenna height, antenna size, and antenna radial position. Results for edge/SOL measurement with both O-and X-modes using proposed antennas are reported.

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Quasi-optical techniques

Cited by 150 publications

References 174 publications

Wave-Shaping Surfaces

Wave-Shaping Surfaces

Quasi-optical analysis of a far-infrared spatio-spectral space interferometer concept

Refractive and relativistic effects on ITER low field side reflectometer design

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