Randomly Multiplexed Diffractive Lens and Axicon for Spatial and Spectral Imaging

Anand, Vijayakumar; Katkus, Tomas; Juodkazis, Saulius

doi:10.3390/mi11040437

Cited by 22 publications

(20 citation statements)

References 30 publications

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“…(b) Applicability range: The technique can be implemented using a quasi-random array of pinholes which is easy to create for any band of the electromagnetic spectrum and therefore the technique can be extended easily to other non-visible bands of the electromagnetic spectrum such as Terahertz and Infrared radiations for industrial applications. (c) Calibration time: The method requires lesser calibration time compared to the earlier studies 30 , 34 as it is sufficient to record the point spread functions only at the axial and spectral boundaries involving four camera shots and all other point spread functions can be synthesized 40 . (d) Hyperspectral imaging and spectrometry: The technique is a natural spectrometer as it is possible to get the spectrum for every pixel of an image.…”

Section: Discussionmentioning

confidence: 99%

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Single shot multispectral multidimensional imaging using chaotic waves

Anand

Maksimovic

et al. 2020

Sci Rep

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Multispectral imaging technology is a valuable scientific tool for various applications in astronomy, remote sensing, molecular fingerprinting, and fluorescence imaging. In this study, we demonstrate a single camera shot, lensless, interferenceless, motionless, non-scanning, space, spectrum, and time resolved five-dimensional incoherent imaging technique using tailored chaotic waves with quasi-random intensity and phase distributions. Chaotic waves can distinctly encode spatial and spectral information of an object in single self-interference intensity distribution. In this study, a tailored chaotic wave with a nearly pure phase function and lowest correlation noise is generated using a quasi-random array of pinholes. A unique sequence of signal processing techniques is applied to extract all possible spatial and spectral channels with the least entropy. The depth-wavelength reciprocity is exploited to see colour from depth and depth from colour and the physics of beam propagation is exploited to see at one depth by calibrating at another.

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Section: Discussionmentioning

confidence: 99%

“…Besides, in 31 – 33 , a holographic optical set up is required with polarization multiplexing and phase shifting. Recently, a modified Fresnel incoherent correlation holography has been demonstrated for 4D imaging with a single camera shot 34 but requires extensive training in the beginning.…”

Section: Introductionmentioning

confidence: 99%

Single shot multispectral multidimensional imaging using chaotic waves

Anand

Maksimovic

et al. 2020

Sci Rep

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“…However, in [19], as the hologram reconstruction was converted into a pattern recognition problem, FINCH showed a higher axial resolution which is not a property of the earlier version of FINCH. In another recent study [22], where an axicon was used instead of a QPM to generate the hologram in FINCH, the higher focal depth and lower spectral sensitivity which are characteristics of a Bessel beam were not observed during the reconstruction [22]. These surprising aspects have not been investigated yet.…”

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confidence: 99%

“…The optical configuration of FINCH in polarization multiplexing scheme [8] and spatial random multiplexing scheme [1,19,22] are shown in Figs. 1(a) and 1(b) respectively.…”

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confidence: 99%

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Review of Fresnel Incoherent Correlation Holography with Linear and Non-Linear Correlations

Anand¹,

Katkus²,

Ng³

et al. 2020

Preprint

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Fresnel incoherent correlation holography (FINCH) is a well-established incoherent imaging technique. In FINCH, three self-interference holograms are recorded with calculated phase differences between the two interfering, differently modulated object waves and projected into a complex hologram. The object is reconstructed without the twin image and bias terms by a numerical Fresnel back propagation of the complex hologram. A modified approach to implement FINCH by a single camera shot by pre-calibrating the system involving recording of the point spread function library and reconstruction by a non-linear cross-correlation has been introduced recently. The expression of the imaging characteristics from the modulation functions in original FINCH and the modified approach by pre-calibration in spatial and polarization multiplexing schemes are reviewed. The study reveals that a reconstructing function completely independent of the function of the phase mask is required for the faithful expression of the characteristics of the modulating function in the image reconstruction. In polarization multiplexing method by cross-correlation, a partial expression was observed, while in spatial multiplexing method by cross-correlation, the imaging characteristics converged towards a uniform behavior.

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Advancements and Applications of Diffractive Optical Elements in Contemporary Optics: A Comprehensive Overview

Khonina,

Kazanskiy,

Skidanov

et al. 2024

Adv Materials Technologies

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Diffractive optical elements (DOEs) represent a revolutionary advancement in modern optics, offering unparalleled versatility and efficiency in various applications. Their significance lies in their ability to manipulate light waves with intricate patterns, enabling functionalities beyond what traditional refractive optics can achieve. DOEs find widespread use in fields such as laser beam shaping, holography, optical communications, and imaging systems. By precisely controlling the phase and amplitude of light, DOEs can generate complex optical structures, correct aberrations, and enhance the performance of optical systems. Moreover, their compact size, lightweight nature, and potential for mass production make them indispensable in designing compact and efficient optical devices for diverse industrial and scientific applications. From improving the performance of laser systems to enabling innovative display technologies, DOEs continue to drive advancements in modern optics, promising even more exciting possibilities in the future. In this review, the critical importance of DOEs is illuminated and explore their profound implications in the contemporary era.

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Randomly Multiplexed Diffractive Lens and Axicon for Spatial and Spectral Imaging

Cited by 22 publications

References 30 publications

Single shot multispectral multidimensional imaging using chaotic waves

Single shot multispectral multidimensional imaging using chaotic waves

Review of Fresnel Incoherent Correlation Holography with Linear and Non-Linear Correlations

Advancements and Applications of Diffractive Optical Elements in Contemporary Optics: A Comprehensive Overview

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