Infrared camera based on a curved retina

Dumas, D. J.P.; Fendler, M.; Berger, Frédéric; Cloix, Baptiste; Pornin, Cyrille; Baier, N.; Druart, Guillaume; Primot, Jérôme; Coarer, E. Le

doi:10.1364/ol.37.000653

Cited by 30 publications

(22 citation statements)

References 14 publications

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“…We demonstrated that the electro-optical performances of a curved infrared 320 x 256 detectors array, based on 25 µm pitch Si-CMOS infrared bolometric structures, were unchanged [14][15]. This result illustrates the fact that the stress induced in the device, evaluated around 150 MPa (max) for a 80 mm concave bending radius, is not sufficient to induce mechanical damages in the micromechanical structure of the device (above-IC suspended membranes).…”

Section: Hemispherical Infrared Focal Plane Arraysmentioning

confidence: 97%

Hemispherical infrared focal plane arrays: a new design parameter for the instruments

Fendler

Dumas

Chemla

et al. 2012

High Energy, Optical, and Infrared Detectors for Astronomy V

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In ground based astronomy, mainly all designs of sky survey telescopes are limited by the requirement that the detecting surface is flat whereas the focal surface is curved. Two kinds of solution have been investigated up to now. The first one consists in adding optical systems to flatten the image surface; however this solution complicates the design and increases the system size. Somehow, this solution increases, in the same time, the weight and price of the instrument. The second solution consists in curving artificially the focal surface by using a mosaic of several detectors, which are positioned in a spherical shape. However, this attempt is dedicated to low curvature and is limited by the technical difficulty to control the detectors alignment and tilt between each others.Today we would like to propose an ideal solution which is to curve the focal plane array in a spherical shape, thanks to our monolithic process developed at CEA-LETI based on thinned silicon substrates which allows a 100% optical fill factor. Two infrared uncooled cameras have been performed, using 320 x 256 pixels and 25 µm pitch micro-bolometer arrays curved at a bending radius of 80 mm. These two micro-cameras illustrate the optical system simplification and miniaturization involved by curved focal plane arrays. Moreover, the advantages of curved detectors on the optical performances (Point Spreading Function), as well as on volume and cost savings have been highlighted by the simulation of the opto-mechanical architecture of the spectrometer OptiMOS-EVE for the European Extremely Large Telescope (E-ELT).Keywords: infrared detectors / components design / curved retina / optical design / large field of view telescope / novel design / advanced detector / Si CMOS detectors / infrared focal plane arrays

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Section: Hemispherical Infrared Focal Plane Arraysmentioning

confidence: 97%

Hemispherical infrared focal plane arrays: a new design parameter for the instruments

Fendler

Dumas

Chemla

et al. 2012

High Energy, Optical, and Infrared Detectors for Astronomy V

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“…[5][6][7][8][9][10] For example, hemispherical photodetector arrays that mimic the vertebrate eyes have shown superior imaging characteristics with simple optics. [11][12][13][14][15][16][17] Different fabrication strategies have been developed to realize such devices.…”

Section: Introductionmentioning

confidence: 99%

Mechanics and optics of stretchable elastomeric microlens array for artificial compound eye camera

Xiao

2015

Journal of Applied Physics

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Compound eye-inspired imaging devices can find vast applications due to their remarkable imaging characteristics, such as extremely large field of view angle, low aberrations, high acuity to motion, and infinite depth of field. Recently, researchers have successfully developed a digital camera that resembles the structure and functions of apposition compound eyes of arthropod, by combining an elastic array of microlenses with a stretchable array of photodetectors in their planar form and then transforming into a hemispherical shape. Designing an elastomeric microlens array that can be mechanically stretched to very large extent without deteriorating the optical performance is critical to this development. In this study, mechanics and optics of the stretchable microlens array, in which each hemispherical microlens sits on top of a supporting post connected to a base membrane, are studied. The results show that proper designs of the microlenses, supporting posts and base membrane are critically important to meet both mechanical and optical requirements simultaneously. This study can have important implications in not only the design of artificial compound eye cameras, but also other developments that require stretchable optical elements.

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“…Pure mono-and polycrystalline silicon lenses are used intensively in the manufacturing of micro-electromechanical systems. However, silicon has become one of the preferred materials for making optical components such as infrared lenses and optical transmitters [1][2][3]. Silicon is suitable for optical applications with a mid-wave infrared range of 0.3 -0.5 µm.…”

Section: Introductionmentioning

confidence: 99%

Quality of silicon convex lenses fabricated by ultra-high precision diamond machining

Abou-El-Hossein¹

2013

sajie

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Infra-red optical components are made mainly from hard and brittle materials such as germanium and silicon. Silicon machining is characterised by some difficulties when ultrahigh precision machined by mono-crystalline single-point diamond. Accelerated tool wear and machined-surface deterioration may take place if the machining parameters are not properly selected. In this study, we conducted a machining test on an ultra-high precision machine tool, using ductile regime cutting conditions when fabricating a convex surface on a silicon lens of aperture of 60 mm diameter, and using a mono-crystalline diamond. It was found that the cutting conditions for shaping a convex surface of 500 mm radius resulted in good form accuracy. However, more attention should be paid to optimising the holding force of the vacuum chuck employed. OPSOMMINGInfrarooi optiese komponente word hoofsaaklik van harde, bros materiale soos germanium en silikon gemaak. Ultra-hoë akkurate masjinering van silikon met 'n mono-kristallyne enkelpunt diamantbeitel gee aanleiding tot verskeie probleme. Versnelde beitelslytasie en degradering van die masjineringsoppervlak kan plaasvind indien die masjineringsparameters nie behoorlik gekies word nie. In hierdie studie het ons 'n masjineringstoets uitgevoer met 'n ultra-hoë akkurate masjineringstelsel, waar rudraaiwerk gebruik is om die konvekse oppervlak van 'n silikonlens met 'n 60 mm opening met 'n mono-kristallyne enkelpunt diamantbeitel te masjineer. Daar is bevind dat die snytoestande wat gebruik is om die konvekse oppervlak met 500 mm radius te vorm, tot goeie vorm-akkuraatheid gelei het. Meer aandag moet egter gegee word aan die optimering van die vashoukrag van die vakuum-kloukop wat gebruik word. a a a a a a a a a a a a a a a a a

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Infrared camera based on a curved retina

Cited by 30 publications

References 14 publications

Hemispherical infrared focal plane arrays: a new design parameter for the instruments

Hemispherical infrared focal plane arrays: a new design parameter for the instruments

Mechanics and optics of stretchable elastomeric microlens array for artificial compound eye camera

Quality of silicon convex lenses fabricated by ultra-high precision diamond machining

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