Transformation optics with windows

Oxburgh, Stephen; White, Chris D.; Antoniou, Georgios; Orife, Ejovbokoghene; Courtial, Johannes

doi:10.1117/12.2061404

Cited by 17 publications

(11 citation statements)

References 14 publications

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“…They have suggested using these pairs of arrays as the building blocks for a passive cloaking device, where the object inside appears shrunk. So far, they have only simulated such effects [18].…”

Section: Digital Integral Cloaking Theorymentioning

confidence: 99%

Digital integral cloaking

Choi

Howell

2016

Optica

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Toward the goal of achieving broadband and omnidirectional invisibility, we propose a method for practical invisibility cloaking. We call this "digital cloaking," where space, angle, spectrum, and phase are discretized. Experimentally, we demonstrate a two-dimensional (2D) planar, ray optics, digital cloak by using lenticular lenses, similar to "integral imaging" for three-dimensional (3D) displays. Theoretically, this can be extended to a good approximation of an "ideal" 3D cloak. With continuing improvements in commercial digital technology, the resolution limitations of a digital cloak can be minimized.

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Section: Digital Integral Cloaking Theorymentioning

confidence: 99%

Digital integral cloaking

Choi

Howell

2016

Optica

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“…[1][2][3] They are used in light-field imaging or integral imaging 4 and can, in principle, be used to construct metamaterial-free Transformation Optics devices. [5][6][7] An example of a pixellated optics devices is shown in Fig. 1.…”

Section: Introductionmentioning

confidence: 99%

“…As a result GCLAs have a large nubmer of degrees of freedom and are being considered for a range of applications, from Low Vision Aids (LVAs), to architectural applications 6 and the pixellated transformation optical devices. 5 The advantage of pixellated transformation optics is that these devices can be cosntructed out of normal optical materials, such as PMMA, allowing them to function throught the visual spectrum. This contrasts other transforamtion optics consisting of metameterials, 9 which are often narrowband.…”

Section: Introductionmentioning

confidence: 99%

Design, manufacture, and evaluation of prototype telescope windows for use in low-vision aids

Bourgenot

Courtial

Cowie

et al. 2017

Novel Optical Systems Design and Optimization XX

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Cyril and Courtial, Johannes (2017) 'Design, manufacture, and evaluation of prototype telescope windows for use in low-vision aids.', in Novel optical systems design and optimization XX. Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.ABSTRACT Pixellated Optics, a class of optical devices which preserve phase front continuity only over small sub areas of the device, allow for a range of uses that would not otherwise be possible. One potential use is as Low Vision Aids (LVAs), where they are hoped to combine the function and performance of existing devices with the size and comfort of conventional eyewear. For these devices a Generalised Confocal Lenslet Array (GCLA) is designed to magnify object space, creating the effect of traditional refracting telescope within a thin, planar device. By creating a device that is appreciably thinner than existing LVA telescopes it is hoped that the comfort for the wearer will be increased. We have developed a series of prototype GLCA-based devices to examine their real-world performance, focussing on the resolution, magnification and clarity of image attainable through the devices. It is hoped that these will form the basis for a future LVA devices. This development has required novel manufacturing techniques and a phased development approach centred on maximising performance. Presented here will be an overview of the development so far, alongside the performance of the latest devices.

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“…We learnt how to construct transformation-optics devices from structures of triangular homogeneous telescope windows. 11,12 Next, we turned our attention to the more complicated case of idealised inhomogeneous telescope windows that image any point in object space to a corresponding point in image space. Such telescope windows are generalisations of ideal thin lenses that have different focal lengths on their two sides; for simplicity, we called such generalised ideal thin lenses glenses.…”

Section: Introductionmentioning

confidence: 99%

Imaging with pairs of skew lenses

Bělín

Oxburgh

Tyc

et al. 2017

Novel Optical Systems Design and Optimization XX

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Many of the properties of thick lenses can be understood by considering these as a combination of parallel ideal thin lenses that share a common optical axis. A similar analysis can also be applied to many other optical systems. Consequently, combinations of ideal lenses that share a common optical axis, or at least optical-axis direction, are very well understood. Such combinations can be described as a single lens with principal planes that do not coincide. However, in recent proposals for lens-based transformation-optics devices the lenses do not share an optical-axis direction. To understand such lens-based transformation-optics devices, combinations of lenses with skew optical axes must be understood. In complete analogy to the description of combinations of pairs of ideal lenses that share an optical axis, we describe here pairs of ideal lenses with skew optical axes as a single ideal lens with sheared object and image spaces. The transverse planes are no longer perpendicular to the optical axis. We construct the optical axis, the direction of the transverse planes on both sides, and all cardinal points. We believe that this construction has the potential to become a powerful tool for understanding and designing novel optical devices.

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Transformation optics with windows

Cited by 17 publications

References 14 publications

Digital integral cloaking

Digital integral cloaking

Design, manufacture, and evaluation of prototype telescope windows for use in low-vision aids

Imaging with pairs of skew lenses

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