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S. A. Stepanov

Bio: S. A. Stepanov is an academic researcher from University of Architecture, Civil Engineering and Geodesy. The author has contributed to research in topics: Diffraction efficiency & Diffraction. The author has an hindex of 10, co-authored 31 publications receiving 269 citations.

Papers
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Journal ArticleDOI
TL;DR: The possibility is shown of achro- and apochromatic correction of an optical system with any residual chromatism by completing the system with a diffractive-refractive hybrid corrector comprising one diffractive lens and one or two refractive lenses.
Abstract: The possibility is shown of achro- and apochromatic correction of an optical system with any residual chromatism by completing the system with a diffractive-refractive hybrid corrector comprising one diffractive lens and one or two refractive lenses.

29 citations

Journal ArticleDOI
TL;DR: It is shown that achievable optical performance of achromatic and apochromatic micro-objectives with plastic lenses satisfy the qualifying standards for cell-phone objectives and closed-circuit television (CCTV) cameras.
Abstract: The possibility and the efficiency of using a single diffractive lens to achromatize and apochromatize micro-objectives with plastic lenses are shown. In addition, recommendations are given on assembling the starting configurations of the objectives and calculating the design parameters required for subsequent optimization. It is also shown that achievable optical performance of achromatic and apochromatic micro-objectives with plastic lenses satisfy the qualifying standards for cell-phone objectives and closed-circuit television (CCTV) cameras.

27 citations

Journal ArticleDOI
TL;DR: A method of designing a plastic zoom lens with a diffractive-refractive hybrid corrector, comprising one diffractive lens and one refractive lens, which provides high optical performance by designing a compact zoom lens for a mobile phone.
Abstract: A method of designing a plastic zoom lens with a diffractive-refractive hybrid corrector, comprising one diffractive lens and one refractive lens, is described. The efficiency of this method is demonstrated by designing a compact zoom lens for a mobile phone. This zoom design, incorporating lenses made only of two commercial optical plastics (polymethylmethacrylate and polycarbonate), provides high optical performance.

26 citations

Journal ArticleDOI
TL;DR: In this paper, the authors determined the microstructure conditions under which the diffractive lens, a part of the wide-spectral optical system, exhibits the highest diffraction efficiency using both electromagnetic and scalar methods.

24 citations

Journal ArticleDOI
TL;DR: The efficiency of the suggested techniques of the optical layout process are demonstrated by using the example of the design and analysis of a zoom lens intended for use in security cameras for day or night vision.
Abstract: The requirements for selecting the initial scheme for a compact plastic zoom lens are formulated. The main stages of the initial scheme of the transformation, incorporating the diffractive lens and replacement of the lenses’ glasses by optical plastics, are presented. The efficiency of the suggested techniques of the optical layout process are demonstrated by using the example of the design and analysis of a zoom lens intended for use in security cameras for day or night vision.

24 citations


Cited by
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Journal ArticleDOI
TL;DR: Single-element planar lenses are reported that not only deliver sub-wavelength focusing, thus beating the diffraction limit of conventional refractive lenses, but also focus light of different colors into the same hotspot.
Abstract: Lenses are crucial to light-enabled technologies. Conventional lenses have been perfected to achieve near-diffraction-limited resolution and minimal chromatic aberrations. However, such lenses are bulky and cannot focus light into a hotspot smaller than a half-wavelength of light. Pupil filters, initially suggested by Toraldo di Francia, can overcome the resolution constraints of conventional lenses but are not intrinsically chromatically corrected. Here we report single-element planar lenses that not only deliver sub-wavelength focusing, thus beating the diffraction limit of conventional refractive lenses, but also focus light of different colors into the same hotspot. Using the principle of super-oscillations, we designed and fabricated a range of binary dielectric and metallic lenses for visible and infrared parts of the spectrum that are manufactured on silicon wafers, silica substrates and optical fiber tips. Such low-cost, compact lenses could be useful in mobile devices, data storage, surveillance, robotics, space applications, imaging, manufacturing with light and spatially resolved nonlinear microscopies.

104 citations

Posted Content
TL;DR: In this paper, the super-oscillations principle was used to design a range of binary dielectric and metallic lenses for visible and infrared parts of the spectrum that are manufactured on silicon wafers, silica substrates and optical fiber tips.
Abstract: Lenses are crucial to light-enabled technologies. Conventional lenses have been perfected to achieve near-diffraction-limited resolution and minimal chromatic aberrations. However, such lenses are bulky and cannot focus light into a hotspot smaller than half wavelength of light. Pupil filters, initially suggested by Toraldo di Francia, can overcome the resolution constraints of conventional lenses, but are not intrinsically chromatically corrected. Here we report single-element planar lenses that not only deliver sub-wavelength focusing (beating the diffraction limit of conventional refractive lenses) but also focus light of different colors into the same hotspot. Using the principle of super-oscillations we designed and fabricated a range of binary dielectric and metallic lenses for visible and infrared parts of the spectrum that are manufactured on silicon wafers, silica substrates and optical fiber tips. Such low cost, compact lenses could be useful in mobile devices, data storage, surveillance, robotics, space applications, imaging, manufacturing with light, and spatially resolved nonlinear microscopies.

83 citations

Journal ArticleDOI
TL;DR: The experimental investigation shows that the Moiré-lenses have a broad adjustable refractive power range with a high efficiency, which allows one to use them for flexible beam steering and for imaging applications.
Abstract: In an earlier publication [Appl. Opt. 47, 3722 (2008)] we suggested an adaptive optical lens, which consists of two cascaded diffractive optical elements (DOEs). Due to the Moire-effect the combined optical element acts as a Fresnel zone lens with a refractive power that can be continuously adjusted by a mutual rotation of the two stacked DOEs. Here we present an experimental realization of this concept. Four designs of these Moire-DOEs (MDOEs) were fabricated in thin (0.7 mm) glass slides by lithography and subsequent etching. Each element was realized as a 16 phase level DOE designed for 633 nm illumination. Our experimental investigation shows that the Moire-lenses have a broad adjustable refractive power range with a high efficiency, which allows one to use them for flexible beam steering and for imaging applications.

66 citations

Proceedings ArticleDOI
06 Jun 2018
TL;DR: In this article, physical approximations and mathematical tools used when modeling diffractive optics elements and devices are analyzed, including focusing optical elements and a space-based Offner hyperspectral imaging spectrometer.
Abstract: I analyze physical approximations and mathematical tools used when modeling diffractive optics elements and devices. Examples of the numerical simulation of focusing optical elements and a space-based Offner hyperspectral imaging spectrometer (hyperspectrometer) are presented. The design of the hyperspectrometer features the use of a diffractive optical element on curved surfaces. The modeling results show that the hyperspectrometer under study offers optical characteristics superior to those of a similar device based on spectral filters.

65 citations

Journal ArticleDOI
TL;DR: A digital color image encryption technique by using a joint transform correlator (JTC) architecture and a wavelength multiplexing operation that sequentially store every JPS in the same medium.
Abstract: We propose a digital color image encryption technique by using a joint transform correlator (JTC) architecture and a wavelength multiplexing operation. In our optical arrangement, the color image to be encrypted is separated into three channels: red, green and blue. One of the JTC apertures contains the input image information corresponding to a determined color channel bonded to a random phase mask, while the other JTC aperture contains the reference random phase key code. Since the speckle size generated by the random phase masks is wavelength dependent, the illuminating wavelength variation will produce a corresponding joint power spectrum (JPS) modification. Consequently, wavelength changes can be used to multiplex the encrypted information associated to each color channel. We sequentially store every JPS in the same medium. We present digital results that confirm our approach.

35 citations