Superachromatic air-spaced triplet

Mikš, Antonı́n; Novák, Jiří

doi:10.1364/ao.53.006930

Cited by 16 publications

(4 citation statements)

References 26 publications

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“…Chromatic aberration can be corrected approximately by using materials that exhibit complementary dispersion, as in an achromatic doublet and triplet 9 10 11 . However, this technique is cumbersome, since the number of materials equals the number of wavelengths where the chromatic aberrations are minimized 10 11 . The extra alignment makes these lenses expensive and bulky.…”

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confidence: 99%

Chromatic-aberration-corrected diffractive lenses for ultra-broadband focusing

Wang

Mohammad

Menon

2016

Sci Rep

183

135

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We exploit the inherent dispersion in diffractive optics to demonstrate planar chromatic-aberration-corrected lenses. Specifically, we designed, fabricated and characterized cylindrical diffractive lenses that efficiently focus the entire visible band (450 nm to 700 nm) onto a single line. These devices are essentially pixelated, multi-level microstructures. Experiments confirm an average optical efficiency of 25% for a three-wavelength apochromatic lens whose chromatic focus shift is only 1.3 μm and 25 μm in the lateral and axial directions, respectively. Super-achromatic performance over the continuous visible band is also demonstrated with averaged lateral and axial focus shifts of only 1.65 μm and 73.6 μm, respectively. These lenses are easy to fabricate using single-step grayscale lithography and can be inexpensively replicated. Furthermore, these devices are thin (<3 μm), error tolerant, has low aspect ratio (<1:1) and offer polarization-insensitive focusing, all significant advantages compared to alternatives that rely on metasurfaces. Our design methodology offers high design flexibility in numerical aperture and focal length, and is readily extended to 2D.

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mentioning

confidence: 99%

Chromatic-aberration-corrected diffractive lenses for ultra-broadband focusing

Wang

Mohammad

Menon

2016

Sci Rep

183

135

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“…The article [11] describes the most well-known methods for solving practical problems of eliminating chromatic aberrations in optical systems. These include: graphical, based on the choice of materials according to the diagrams of relative average and partial dispersions [12]; analytical using functions of changing the refractive index of materials depending on the wavelength [13] or using third-order aberrations [14]. In [13,14], the lens is considered as a series of closely standing components, which limits the possibilities of the method for creating zoom systems, systems with separated components, or with an intermediate image plane.…”

Section: Chromatical Focal Shift Modeling For Dwir Rangementioning

confidence: 99%

Development of dual-band infrared lenses

Khatsevich,

Shmelev

2023

29th International Symposium on Atmospheric and Ocean Optics: Atmospheric Physics

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A technique for providing apochromatic correction in the wavelength range from 3 to 12 μm, which makes it possible to substantiate the choice of materials and optical powers in an optical system with components separated by an air gap, is discussed. Using numerical methods, it is shown that the solutions found can serve as starting systems for the development of dual-band lenses that provide a stable position of the image plane in the ranges of 3-5 and 8-12 μm, coupled with uncooled dual-band infrared detectors. The results are illustrated by the calculation of a dual-band infrared lens with a focal length of 50 mm and a relative aperture of 1:1.2.

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“…[ 1,2 ] In terms of traditional refractive imaging lenses, the spatial distribution of the constructed dielectric material refractive index determines the deflection of the incident light. Since the refractive index of the dielectric material is related to the wavelength, the behavior of focus inevitably shows “positive dispersion.” Generally, the method of reducing chromatic aberration is distinct dispersion complementation, including the achromatic doublet (triplet) of different glass‐based materials [ 3,4 ] and the hybrid diffractive–refractive achromatic lens. [ 5–7 ] However, the multi‐component design consequentially makes the optical device bulky and heavy, which is in contrast to the trend toward miniaturization of modern optical systems.…”

Section: Introductionmentioning

confidence: 99%

A Holographic Broadband Achromatic Metalens

Wang,

Liu,

et al. 2023

Laser & Photonics Reviews

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Metalens with nanostructured optical elements are designed to control wavefront shaping at the wavelength‐scale thickness. However, most metalens still suffer from large chromatic aberrations due to phase dispersion, limiting their wide applications for multiple wavelengths. Here, avoiding complex resonant designs or multiple‐layer nanostructures, a simple broadband achromatic metalens by holographic diffraction in the visible spectrum is demonstrated. The hyperbolic phase distributions of multiple discrete wavelengths within a shared aperture and fabricate a broadband achromatic diffractive metalens by flexible direct‐laser‐writing technique is randomly interleaved. The designed polarization‐insensitive metalens modulate the light field by changing the height of the artificial neuron phase units to achieve average focusing efficiencies of 55% in the visible spectrum. This holographic design concept can pave the way to expand achromatic metalenses to multiple spectra.

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Superachromatic air-spaced triplet

Cited by 16 publications

References 26 publications

Chromatic-aberration-corrected diffractive lenses for ultra-broadband focusing

Chromatic-aberration-corrected diffractive lenses for ultra-broadband focusing

Development of dual-band infrared lenses

A Holographic Broadband Achromatic Metalens

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