Extra-thin infrared camera for low-cost surveillance applications

Grulois, Tatiana; Druart, Guillaume; Guérineau, Nicolas; Crastes, A.; Sauer, Hervé; Chavel, Pierre

doi:10.1364/ol.39.003169

Cited by 44 publications

(23 citation statements)

References 11 publications

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“…An 80-normalμm-thick polymer Fresnel lens combined with a 755-normalμm-thick refractive silicon lens was used to report the thinnest LWIR lens (total device thickness ∼0.8 mm) capable of imaging (20). A high-order Silicon Fresnel lens made out of silicon was used in combination with an aperture for wide-angle imaging in the LWIR band as well (21), which had a total device thickness of 1 mm. In comparison, the device thickness of our single MDL is only 10 normalμm (a reduction of 100×) and it comprises a patterned polymer.…”

mentioning

confidence: 99%

Broadband lightweight flat lenses for long-wave infrared imaging

Meem

Banerji

Majumder

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

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We experimentally demonstrate imaging in the long-wave infrared (LWIR) spectral band (8 μm to 12 μm) using a single polymer flat lens based upon multilevel diffractive optics. The device thickness is only 10 μm, and chromatic aberrations are corrected over the entire LWIR band with one surface. Due to the drastic reduction in device thickness, we are able to utilize polymers with absorption in the LWIR, allowing for inexpensive manufacturing via imprint lithography. The weight of our lens is less than 100 times those of comparable refractive lenses. We fabricated and characterized 2 different flat lenses. Even with about 25% absorption losses, experiments show that our flat polymer lenses obtain good imaging with field of view of 35° and angular resolution less than 0.013°. The flat lenses were characterized with 2 different commercial LWIR image sensors. Finally, we show that, by using lossless, higher-refractive-index materials like silicon, focusing efficiencies in excess of 70% can be achieved over the entire LWIR band. Our results firmly establish the potential for lightweight, ultrathin, broadband lenses for high-quality imaging in the LWIR band.

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mentioning

confidence: 99%

Broadband lightweight flat lenses for long-wave infrared imaging

Meem

Banerji

Majumder

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

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“…The chromatic dispersion property has been used to compensate for chromatic aberration of refractive lenses in diffractive-refractive doublets typically operating in order 1 in the visible or in the infrared. Indeed, because of the strong negative chromatic dispersion of diffractive lenses, while all glasses show positive index dispersion, a hybrid diffractive/refractive doublet can be made achromatic by associating a diffractive surface to an ordinary lens, with the diffractive structure possibly etched directly onto one of the lens surfaces [10] .…”

Section: Principle Of Diffractive Opticsmentioning

confidence: 99%

Transmissive diffractive membrane optic for large aperture lightweight optical telescope

Zhang¹,

Jiao²,

Wang³

et al. 2015

SPIE Proceedings

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Transmissive diffractive membrane optic can be used in space optical telescope to reduce the size and mass of imaging system. Based on the international research results about transmissive diffractive membrane, a 4-level diffractive substrate with 100mm apertures was designed and transmissive diffractive membrane was fabricated by spin coating. High-precision support structure for diffractive membrane with surface precision 0.12λ RMS (λ=632.8nm) was introduced, and that can meet the diffractive imaging requirements. Diffraction efficiency of the diffractive membrane supported by support structure was tested, and the test results showed that diffraction efficiency was >50%. The step figure test results illustrated the etched deep precision was less the 10nm. The imaging wavefront test result demonstrated a wavefront error of about 38 nm RMS. The transmissive diffractive membrane optic can be very useful for large aperture imaging system to realize low mass and low cost.

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“…A major obstacle in the path towards realizing the potential of such lenses is the large chromatic aberration associated with diffractive lenses (metalenses are actually a sub-category of diffractive lenses, so they exhibit the same basic dispersion). To meet this challenge, achromatic metalenses (AMLs) [14][15][16][17][18][19][20][21] and achromatic diffractive lenses (ADLs) [22][23][24][25] have been developed. While these designs have shown achromatic behavior, they have not so far shown much utility for practical applications.…”

Section: Introductionmentioning

confidence: 99%

Achromatic diffractive lens limits

Engelberg¹,

Levy

2020

Preprint

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Over the recent years, there have been many reports of achromatic metalenses and diffractive lenses. However, very few (if any) practical applications of such achromatic flat lenses have been demonstrated, which raises questions about the potential of these lenses to provide solutions for real world cases which involve broadband illumination. A recent paper placed limits on the performance of achromatic metalenses. However, is this limit also valid for a diffractive lens? Not necessarily so. In this paper we derive the limits on the performance of achromatic diffractive lenses. In particular, we show that achromatic diffractive lenses can cover a wide spectral range, limited only by loss of efficiency caused by manufacturing limitations related to feature depth and size. On the other hand, we show that achromatic diffractive lenses can provide near diffraction limited performance only at very low Fresnel numbers, i.e. they cannot provide large focusing power and broadband response simultaneously. We then go on to compare the limits of achromatic metalenses and diffractive lenses, in attempt to understand the potential of different types of flat lenses. Our findings may set the ground for better evaluation of flat lens performance, understanding of their capabilities and limitations, and for exploring novel design concepts and applications.

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Extra-thin infrared camera for low-cost surveillance applications

Cited by 44 publications

References 11 publications

Broadband lightweight flat lenses for long-wave infrared imaging

Broadband lightweight flat lenses for long-wave infrared imaging

Transmissive diffractive membrane optic for large aperture lightweight optical telescope

Achromatic diffractive lens limits

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