Sylvain Rommeluère
Office National d'Études et de Recherches Aérospatiales
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Publication
Featured researches published by Sylvain Rommeluère.
Infrared Physics & Technology | 2003
Alfredo De Rossi; Eric Costard; Nicolas Guérineau; Sylvain Rommeluère
We study the optical coupling in quantum well photodetectors, focusing on finite size effects. We introduced a finite-element model of the detector and we show experimentally that the optical coupling efficiency is strongly dependent on the pixel size and that in very small detectors diffraction dominates the grating coupling. A 640 × 512 QWIP focal plane array was characterized to show that the optical response of thinned samples may depend on the substrate thickness noticeably. These results are in much closer agreement with predictions obtained with our model than using standard techniques.
Applied Optics | 2009
Guillaume Druart; Nicolas Guérineau; Riad Haïdar; Sophie Thétas; Jean Taboury; Sylvain Rommeluère; Jérôme Primot; Manuel Fendler
We present an original and compact optical system inspired by the unusual eyes of a Strepsipteran insect called Xenos peckii. It is designed for a field of view of 30 degrees and is composed of multiple telescopes. An array of prisms of various angles is placed in front of these telescopes in order to set a different field of view for each channel. This type of camera operates in the [3-5 microm] spectral bandwidth and is entirely integrated in a Dewar in order to maximize its compactness. Experimental images are presented to validate this design.
Optics Letters | 2008
Sylvain Rommeluère; Nicolas Guérineau; Riad Haïdar; Joël Deschamps; Eric De Borniol; Alain Million; Jean-Paul Chamonal; G. Destefanis
A novel configuration of stationary Fourier transform infrared (FTIR) spectrometer is presented. Contrary to classic configurations, the interferometer is directly integrated in the focal plane array (FPA) during its process of fabrication. A first, to the best of our knowledge, demonstration of the spectrometric function has been achieved departing from a well-known structure of an HgCdTe photodetector. We show that the obtained FTIR-FPA can be described by intrinsic parameters such as an optical path difference and a so-called spectrometric efficiency. First experimental results are presented.
Applied Optics | 2007
Sylvain Rommeluère; Riad Haïdar; Nicolas Guérineau; Joël Deschamps; E. De Borniol; Alain Million; Jean-Paul Chamonal; G. Destefanis
We present what is believed to be a novel experimental method to measure the technological parameters (spectral response and quantum yield) of an infrared focal plane array. This method makes original use of a Fourier transform spectrometer, which allows us to simultaneously extract the spectral performances of all pixels from one single set of measurements. The methodology used and the principle of the experimental setup are detailed. A Fourier analysis is shown to provide various optogeometrical information on the detector microstructure. A demonstrator based on the HgCdTe technology was designed, and satisfactory experimental results were obtained.
Applied Optics | 2009
Guillaume Druart; Nicolas Guérineau; Jean Taboury; Sylvain Rommeluère; Riad Haïdar; Jérôme Primot; Manuel Fendler; Jean-Charles Cigna
The performances of a compact infrared optical system using advanced pinhole optics for wide field applications are given. This concept is adapted from the classical Tisse design in order to fit with infrared issues. Despite a low light gathering efficiency and a low resolution in comparison with classical lenses, pinhole imagery provides a long depth of field and a wide angular field of view. Moreover, by using a simple lens that compresses the field of view, the angular acceptance of this pinhole camera can be drastically widened to a value around 180°. This infrared compact system is named pinhole fisheye since it is based on the field lens of a classical fisheye system.
Applied Optics | 2006
Sabrina Velghe; Riad Haïdar; Nicolas Guérineau; Michel Tauvy; Sylvain Rommeluère; Sophie Thétas; G. Dunet; Jérôme Primot
We propose to evaluate infrared lenses with a dedicated analyzer having the same mechanical interface as the usual cameras. The proposed analysis is based on a wavefront measurement and allows a diagnostic of possible internal defects of the analyzed lens. The infrared lens analyzer described is constituted with a quadriwave lateral shearing interferometer and works with a blackbody light. We describe the response of this interferometer and an innovative method to obtain the wavefront under test. We finally present the experimental analysis of long-wavelength infrared lenses and the particular case of a modified lens that generates a large spherical aberration.
Infrared Technology and Applications XXX | 2004
Sylvain Rommeluère; Nicolas Guérineau; Joël Deschamps; Eric De Borniol; Alain Million; Jean-Paul Chamonal; G. Destefanis
By measuring the spectral responses of infrared focal plane arrays (IRFPAs), one can extract at a given wavelength the cartography of the pixels responses, called the hyperspectral cartography. Recently, hyperspectral cartographies have been obtained from IRFPAs that exhibited small defects of substrate thickness. These defects produce Fizeau fringes across the FPA. By purposely amplifying this phenomenon during the process of realisation, one can easily generate a good approximation of a two-beam interferometer in the immediate neighbourhood of the FPA. Like a classic Michelson interferometer with tilted plane mirrors, this on-a-chip interferometer produces a spatially-modulated interferogram, the Fourier-transform of which yields the spectral content of the illuminating beam. A first prototype of this Fourier-transform microspectrometer on a chip (MICROSPOC) has been realised and tested. Experimental results will be presented and the potential of this approach will be discussed.
Journal of The Optical Society of America A-optics Image Science and Vision | 2012
Frédéric Gillard; Yann Ferrec; Nicolas Guérineau; Sylvain Rommeluère; Jean Taboury; Pierre Chavel
Stationary Fourier transform spectrometry is an interesting concept for building reliable field or embedded spectroradiometers, especially for the mid- and far- IR. Here, a very compact configuration of a cryogenic stationary Fourier transform IR (FTIR) spectrometer is investigated, where the interferometer is directly integrated in the focal plane array (FPA). We present a theoretical analysis to explain and describe the fringe formation inside the FTIR-FPA structure when illuminated by an extended source positioned at a finite distance from the detection plane. The results are then exploited to propose a simple front lens design compatible with a handheld package.
Proceedings of SPIE, the International Society for Optical Engineering | 2008
Guillaume Druart; Nicolas Guérineau; Riad Haïdar; Eric Lambert; Michel Tauvy; Sophie Thétas; Sylvain Rommeluère; Jérôme Primot; Joël Deschamps
There is an emerging demand for compact infrared instruments, imagers and/or spectrometers, integrated on ground or air vehicles for spatial and spectral data collection. To reach this goal, technological barriers have already been overcome, leading to the development of infrared focal plane arrays (IRFPAs) for high-performance applications (megapixel format, bispectral technology) but also for low-cost and high-volume manufacturing (technology of uncooled micro-bolometers). The next step is to reduce the optics and make it compatible with the successful IRFPAs fabrication technology. This paper presents MULTICAM, a small cryogenic infrared camera. This optical system is composed of multi-level arrays of microlenses integrated in the cryostat and inspired from invertebrate compound eyes. First experimental results will be presented.
Proceedings of SPIE, the International Society for Optical Engineering | 2008
Guillaume Druart; Nicolas Guérineau; Michel Tauvy; Sylvain Rommeluère; Jérôme Primot; Joël Deschamps; Manuel Fendler; Jean-Charles Cigna; Jean Taboury
Circular diffraction gratings (also called diffractive axicons) are optical components producing achromatic non-diffracting beams. They thus produce a focal line rather than a focal point for classical lenses. We have recently shown in the visible spectral range that this property can be used to design a simple imaging system with a long depth of focus and a linear variable zoom by using and translating a diffractive axicon as the only component. We have then adapted this principle for the mid-wavelength infrared (MWIR) spectral range and the long-wavelength infrared (LWIR) spectral range. A LWIR low-cost micro-camera, called MICROCARD, has been designed and realized. First images from this camera will be shown. Moreover a way to design a compact MWIR micro-camera with moveable parts integrated directly into the cryostat will be presented.