Review of engineering techniques in chaotic coded aperture imagers

Anand, Vijayakumar; Rosen, Joseph; Juodkazis, Saulius

doi:10.37188/lam.2022.024

Cited by 22 publications

(24 citation statements)

References 46 publications

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“…For vortex-beam generation, the optical modulator is a spiral Fresnel lens with a phase of

, where L is the topological charge and θ is the azimuthal angle given as

[ 43 , 44 ]. For the generation of a scattered beam, the optical modulator is a quasi-random lens with a phase given as

, where Φ R is the random phase matrix with a particular scattering degree synthesized using Gerchberg–Saxton algorithm (GSA) [ 2 , 15 , 26 ]. For the generation of accelerating Airy beams, the optical modulator is a cubic phase mask with a phase given as

[ 45 ].…”

Section: Methodsmentioning

confidence: 99%

“…The noninterferometric indirect-imaging methods include transport of intensity equations-based imaging [ 11 , 12 ], ghost imaging [ 13 ] and coded-aperture imaging (CAI) [ 14 , 15 ]. In this review, only CAI is considered.…”

Section: Introductionmentioning

confidence: 99%

“…In this review, only CAI is considered. In CAI, the object intensity distribution is transformed into a specific intensity pattern using a coded mask followed by a computational reconstruction [ 14 , 15 ]. In the first reported studies by Ables [ 16 ] and Dicke [ 17 ] on coded apertures, people used a random array of pinholes to scatter light, generating artifacts and noise during the reconstruction.…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear Reconstruction of Images from Patterns Generated by Deterministic or Random Optical Masks—Concepts and Review of Research

et al. 2022

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Indirect-imaging methods involve at least two steps, namely optical recording and computational reconstruction. The optical-recording process uses an optical modulator that transforms the light from the object into a typical intensity distribution. This distribution is numerically processed to reconstruct the object’s image corresponding to different spatial and spectral dimensions. There have been numerous optical-modulation functions and reconstruction methods developed in the past few years for different applications. In most cases, a compatible pair of the optical-modulation function and reconstruction method gives optimal performance. A new reconstruction method, termed nonlinear reconstruction (NLR), was developed in 2017 to reconstruct the object image in the case of optical-scattering modulators. Over the years, it has been revealed that the NLR can reconstruct an object’s image modulated by an axicons, bifocal lenses and even exotic spiral diffractive elements, which generate deterministic optical fields. Apparently, NLR seems to be a universal reconstruction method for indirect imaging. In this review, the performance of NLR isinvestigated for many deterministic and stochastic optical fields. Simulation and experimental results for different cases are presented and discussed.

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“…For vortex-beam generation, the optical modulator is a spiral Fresnel lens with a phase of

, where L is the topological charge and θ is the azimuthal angle given as

[ 43 , 44 ]. For the generation of a scattered beam, the optical modulator is a quasi-random lens with a phase given as

[ 45 ].…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Nonlinear Reconstruction of Images from Patterns Generated by Deterministic or Random Optical Masks—Concepts and Review of Research

et al. 2022

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show abstract

“…For vortex-beam generation, the optical modulator is a spiral Fresnel lens with a phase of exp −j Lθ + πR 2 /λ (1/u + 1/v ) , where L is the topological charge and θ is the azimuthal angle given as θ = tan −1 (y/x) [43,44]. For the generation of a scattered beam, the optical modulator is a quasi-random lens with a phase given as exp −j πR 2 /λ (1/u + 1/v ) + Φ R , where Φ R is the random phase matrix with a particular scattering degree synthesized using Gerchberg-Saxton algorithm (GSA) [2,15,26]. For the generation of accelerating Airy beams, the optical modulator is a cubic phase mask with a phase given as exp −j(2π/λ)ζ x 3 + y 3 [45].…”

Section: Methodsmentioning

confidence: 99%

“…The noninterferometric indirect-imaging methods include transport of intensity equationsbased imaging [11,12], ghost imaging [13] and coded-aperture imaging (CAI) [14,15]. In this review, only CAI is considered.…”

Section: Introductionmentioning

confidence: 99%

Non-Linear Reconstruction of Images from Patterns Generated by Deterministic or Random Optical Masks – Concepts and Review of Research

Smith¹,

Gopinath²,

Arockiaraj³

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

Indirect imaging methods involve at least two steps, namely optical recording, and computational reconstruction. The optical recording process uses an optical modulator that transforms the light from the object into a typical intensity distribution. This distribution is numerically processed to reconstruct the object’s image corresponding to different spatial and spectral dimensions. There have been numerous optical modulation functions and reconstruction methods developed in the past years for different applications. In most cases, a compatible pair of optical modulation function and reconstruction method gives optimal performance. A new reconstruction method termed non-linear reconstruction (NLR) was developed in 2017 to reconstruct the object image in the case of optical scattering modulators. During the years, it was revealed that the NLR could reconstruct an object’s image modulated by an axicons, bifocal lenses and even exotic spiral diffractive elements, which generate deterministic optical fields. Apparently, NLR seems to be a universal reconstruction method for indirect imaging. In this review, the performance of NLR has been investigated for many deterministic and stochastic optical fields. Simulation and experimental results for different cases are presented and discussed.

show abstract