Zone Plates and Their Aberrations

Young, Matt

doi:10.1364/josa.62.000972

Cited by 162 publications

(64 citation statements)

References 16 publications

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“…The accuracy with which the lens module must keep the axis of the lens pointed towards the target is only that needed to avoid aberrations due to using the lens too far off-axis. The formulae derived by Young (1972) for the aberrations of zone plates show that field curvature is the dominant effect in the case under consideration here and that it is insignificant for off-axis angles of less than a degree. Thus the pointing requirement for the lens module is trivial.…”

Section: Mission Considerationsmentioning

confidence: 73%

Diffractive/refractive optics for high energy astronomy

Skinner

2001

A&A

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Abstract.Diffractive optics components such as Fresnel Zone Plates and their derivatives potentially form the basis for telescope systems for X-ray and gamma-ray astronomy with high sensitivity and superb angular resolution. The main problem is that systems with convenient design parameters involve very long focal lengths. The design considerations and performance of telescopes using a simple Phase Fresnel Lens on one spacecraft and a detector assembly on another are considered. Such systems are shown to have the potential to provide orders of magnitude improvement on currently available sensitivity. At the same time the angular resolution can be at the micro arcsecond level or better -sufficient to resolve the structure surrounding the event horizon of black holes in nearby galaxies.

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Section: Mission Considerationsmentioning

confidence: 73%

Diffractive/refractive optics for high energy astronomy

Skinner

2001

A&A

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“…where the approximate result given in the second line has been obtained by series expansion of the square root and the trigonometric functions [10,11]. The four terms in the square brackets of this equation can be identified as follows: the first one is the paraxial approximation to a spherical wavefront, the second term is spherical aberration, the third term is astigmatism and field curvature, and the fourth term is coma.…”

Section: Analytical Solution For An On-axis Reflectarray Systemmentioning

confidence: 99%

Monochromatic aberrations in resonant optical elements applied to a focusing multilevel reflectarray

Ginn¹,

Alda²,

Gómez‐Pedrero³

et al. 2010

Opt. Express

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Abstract:The monochromatic aberrations produced by the phase distribution reflected by resonant sub-wavelength metallic structures are studied both analytically and numerically. Even for normal incidence, the angular dependence of the re-radiated wavefront disturbs the overall performance of the reflectarray. This effect is modelled as combination of a linear and a cubic dependence. A complete numerical simulation of a multilevel focusing reflectarray is performed using computationalelectromagnetic and physical-optics-propagation methods. A modified Strehl ratio is defined to show the dependence of the focused spot behavior on aperture. The irradiance distribution is dependent on the polarization state. A small-aperture focusing reflectarray has been designed, fabricated, and tested. The irradiance distribution at the focusing plane is compared with the simulated one, showing a good agreement when residual wavefront aberrations are included.

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“…It is a spectrometer based on a focal length dependent binary zone plate (BZP) for IR spectral discrimination. BZP lenses are commonly used in applications related to X-ray microscopy and X-ray tomography [4,5]. However, they have also been used in applications designed for the IR spectrum.…”

Section: Introductionmentioning

confidence: 99%

Binary Zone Plate Infrared Spectrometer for Dissolved Gas Analysis in High Voltage Equipment

Glowacki

Shafai

2017

Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017

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An IR spectrometer based on a Binary Zone Plate (BZP) is presented for dissolved gas analysis. The wavelength selective focal length of the BZP can effectively discriminate between wavelengths ranging from 800 nm to 8 μm, by adjusting the focus distance onto an aperture in the image plane from 19 mm to 200 mm. The aperture serves to pass focused radiation onto the detector. The BZP has a focal length of 50 mm for a design wavelength of 3 μm, with 400 zones. This design enables discrimination between all key fault gases present in oil impregnated high voltage equipment.

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Zone Plates and Their Aberrations

Cited by 162 publications

References 16 publications

Diffractive/refractive optics for high energy astronomy

Diffractive/refractive optics for high energy astronomy

Monochromatic aberrations in resonant optical elements applied to a focusing multilevel reflectarray

Binary Zone Plate Infrared Spectrometer for Dissolved Gas Analysis in High Voltage Equipment

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