Single-shot multispectral imaging through a thin scatterer

Li, Xiaohan; Greenberg, Joel A.; Gehm, Michael E.

doi:10.1364/optica.6.000864

Cited by 60 publications

(35 citation statements)

References 46 publications

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“…In general, the chaotic wave‐based imaging system can be realized using different optical configurations, with different types of chaotic wave generators and reconstruction mechanisms. [ 20,22,41–43 ] All the aforementioned methods require extensive training involving recording of all the spatial and spectral PSHs or iterative algorithm and suffer from a lower signal‐to‐noise ratio (SNR) and have been demonstrated mostly on binary amplitude objects.…”

Section: Coherent and Incoherent Multidimensional Holography: Definitmentioning

confidence: 99%

Spatio‐Spectral‐Temporal Imaging of Fast Transient Phenomena Using a Random Array of Pinholes

Anand

Katkus

et al. 2020

Advanced Photonics Research

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Fast transient phenomena such as light–matter interactions, rapid electrical discharge, light scattering in tissues, and biochemical reactions that generate light signatures can be studied using high‐speed cameras. Herein, a lensless, single camera shot, spatio‐spectral‐temporal imaging technique based on chaotic waves is proposed and demonstrated. A random pinhole array is used as a chaotic wave generator to map every color point source in the object space to a unique random distribution. The spatio‐spectral signatures are recorded for two cases using a monochrome high‐speed camera, and an extensive library of spatio‐spectral signatures is synthesized by computational interpolation and extrapolation using the scaling factors of the Fresnel propagators. A spark generated by an abrupt electrical discharge is converted into a chaotic wave using the same pinhole array, and the hologram is recorded using the monochrome high‐speed camera in time. The recorded hologram of the spark is decomposed into spatio‐spectral 4D events in time with a temporal resolution of 40 μs using the semisynthetic spatio‐spectral signatures.

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Section: Coherent and Incoherent Multidimensional Holography: Definitmentioning

confidence: 99%

Spatio‐Spectral‐Temporal Imaging of Fast Transient Phenomena Using a Random Array of Pinholes

Anand

Katkus

et al. 2020

Advanced Photonics Research

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“…Imaging through scattering and diffusive media has been an important problem for many decades, with numerous solutions reported so far [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. In various fields, including e.g., biomedical optics [5,20], atmospheric physics [6,21], remote sensing [22,23], astronomy [24,25], oceanography [26,27], security [28,29] as well as autonomous systems and robotics [30][31][32], the capability to rapidly see through diffusive and scattering media is of utmost importance.…”

Section: Main Textmentioning

confidence: 99%

Computational imaging without a computer: seeing through random diffusers at the speed of light

Luo

Zhao

et al. 2022

eLight

108

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Imaging through diffusers presents a challenging problem with various digital image reconstruction solutions demonstrated to date using computers. Here, we present a computer-free, all-optical image reconstruction method to see through random diffusers at the speed of light. Using deep learning, a set of transmissive diffractive surfaces are trained to all-optically reconstruct images of arbitrary objects that are completely covered by unknown, random phase diffusers. After the training stage, which is a one-time effort, the resulting diffractive surfaces are fabricated and form a passive optical network that is physically positioned between the unknown object and the image plane to all-optically reconstruct the object pattern through an unknown, new phase diffuser. We experimentally demonstrated this concept using coherent THz illumination and all-optically reconstructed objects distorted by unknown, random diffusers, never used during training. Unlike digital methods, all-optical diffractive reconstructions do not require power except for the illumination light. This diffractive solution to see through diffusers can be extended to other wavelengths, and might fuel various applications in biomedical imaging, astronomy, atmospheric sciences, oceanography, security, robotics, autonomous vehicles, among many others.

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“…The rare earth (RE) in composition with nanophosphors can demonstrate acute inception and radiation spectra in UV-Vis region with great amount efficiency, extended working duration, stable chemical composition, heat, and light display, environment friendly and minimal waste. In recent studies, the quantum yield of Sr4Al14O25 [13]; Ca14Al10Zn6O35 [14]; CaAl12O19 [15]; Sr4Al14-O25:Mn 4+ [16] is estimated to be 38%, 50%, 35.5%, 60.8% under 450 nm blue light excitation, and 166% respectively [17];. The trivalent luminous lanthanide (Ln 3+ ) ions, which have a comparable ion radius to composite particles, are reasonably easy to mix to the particle configuration and provide good lighting performance even at ambient temperature [18]- [21].…”

Section: Introductionmentioning

confidence: 99%

Enhancing optical properties of WLEDs with LaOF:Eu3+&SiO2 application

Huu

Thi

2022

Bulletin EEI

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After many efforts, the core-shell nanostructure of LaOF:Eu3+SiO2 that emits bright red radiation can be fabricated by simple solvothermal application succeeded by heat treatment. The resulted particles from the fabrication process are small in size, able to demonstrate circular form more efficient and prevent stacking. Photoluminescence (PL) emission spectra exhibits intense peaks at 593 nm, 611 nm, 650 nm corresponds to 5D0 -- 7FJ (J = 0, 1 and 2) Eu3+ transitions respectively. The spectral intensity parameters and Eu-O ligand behaviors are estimated by means of Judd-Ofelt (J-O) theory. CIE co-ordinates are found to be (x = 0.63, y = 0.36) which is very close to standard NTSC values (x = 0.67, y = 0.33). CCT value is 3475 K which is less than 5000 K, as a result this phosphor is suitable for warm light emitting diodes. The optimized core-shell SiO2 (coat III)@LaOF:Eu3+ (5 mol%) was used as a fluorescent labeling marker to identity latent fingerprints on both porous and non-porous surfaces. The fingerprints results are highly sensitive, selective and also has no obstruction caused by the back-ground which supports level-I to level-III fingerprint ridge recognition. The experiments outcomes suggest that the enhancements brought by the core-shell NS structure can be further examined to apply in forensic and solid state lightning applications.

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Single-shot multispectral imaging through a thin scatterer

Cited by 60 publications

References 46 publications

Spatio‐Spectral‐Temporal Imaging of Fast Transient Phenomena Using a Random Array of Pinholes

Spatio‐Spectral‐Temporal Imaging of Fast Transient Phenomena Using a Random Array of Pinholes

Computational imaging without a computer: seeing through random diffusers at the speed of light

Enhancing optical properties of WLEDs with LaOF:Eu3+&SiO2 application

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