Edge contrast enhancement of Fresnel incoherent correlation holography (FINCH) microscopy by spatial light modulator aided spiral phase modulation

Xu, Tianxu; He, Jiuru; Hong, Ren; Zhongliang, Zhao; Ma, Guangfu; Gong, Qihuang; Yang, Shuman; Dong, Lin; Ma, Fang

doi:10.1364/oe.25.029207

Cited by 25 publications

(11 citation statements)

References 31 publications

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“…Traditional incoherent differentiation systems often utilize different PSF filters in the Fourier plane for small numerical aperture (NA) imaging systems or separate holographic apertures for larger NAs [26][27][28] to acquire different OTFs. Modulation between different OTFs is realized by spatial or temporal multiplexing of separate apertures, which complicates the system and may causes image mismatch from apertures that are physically separated.…”

Section: Optimization Of a Multilayer Film For Incoherent Differentia...mentioning

confidence: 99%

Incoherent Optoelectronic Differentiation Based on Optimized Multilayer Films

Zhang

Bai

Sun

et al. 2022

Laser & Photonics Reviews

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Fourier‐based optical computing operations, such as spatial differentiation, have recently been realized in compact form factors using flat optics. Experimental demonstrations, however, have been limited to coherent light requiring laser illumination and leading to speckle noise and unwanted interference fringes. Here, the use of an optimized multilayer film, combined with dual color image subtraction, is demonstrated to realize differentiation with unpolarized incoherent light. Global optimization is achieved by employing neural networks combined with the reconciled level set method to optimize the optical transfer function of a multilayer film at wavelengths of 532 and 633 nm. Spatial differentiation is then achieved by subtracting the normalized incoherent images at these two wavelengths. The optimized multilayer film is experimentally demonstrated to achieve incoherent differentiation with a resolution of 6.2 μ$\umu$m. The use of a multilayer film allows for scalable lithography‐free fabrication and results in a system that could open the door to high‐speed processing for a wide variety of incoherent, and coherent, imaging systems.

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Section: Optimization Of a Multilayer Film For Incoherent Differentia...mentioning

confidence: 99%

Incoherent Optoelectronic Differentiation Based on Optimized Multilayer Films

Zhang

Bai

Sun

et al. 2022

Laser & Photonics Reviews

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“…For the simulative studies, the following design parameters are considered: λ = 0.6 μm, z s = 20 cm, z d = 0, z h = 40 cm, aperture diameter D = 4 mm, NA = 0.01, and z r = 20 cm. Direct imaging with a lens of phase Φ k = −πR 2 =λf 3 and focal length f 3 = 1=z s 1=z h −1 = 13.33 cm, FINCH in the polarization multiplexing scheme and spatial multiplexing scheme with a QPM of phase Φ k = −πR 2 =λf 4 θ k and focal length f 4 = z h =2= 20 cm, an axilens [23] with a phase Φ k = −πR 2 =λf 5 R θ k and a focal length f 5 R = f 0 4Δz=D 2 R, where Δz = 2 cm and f 0 = 19 cm, an axicon with a phase Φ k = −2π=λγR θ k , where γ = 0.005 rad [24,25] , and a SQPM Φ k = −πR 2 =λf 4 LΨ θ k with L = 1 [26,27] are compared. The phase images of the QPM, axilens, axicon, and SQPM are shown in Figs.…”

Section: Simulative Studiesmentioning

confidence: 99%

Review of Fresnel incoherent correlation holography with linear and non-linear correlations [Invited]

Anand

Katkus

et al. 2021

Chin. Opt. Lett.

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Fresnel incoherent correlation holography (FINCH) is a well-established incoherent imaging technique. In FINCH, three selfinterference 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 nonlinear 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 image reconstruction. In the polarization multiplexing method by non-linear cross correlation, a partial expression was observed, while in the spatial multiplexing method by non-linear cross correlation, the imaging characteristics converged towards a uniform behavior.

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“…The MIR signal is converted into the visible (≈462-500 nm) idler; thus, allowing our MIR imaging system to be detected by a highperformance visible detector. The OPA imaging occurring at the Fourier plane of a 4f system is pumped by a vortex laser pulse for edge-enhancement [36,37] to improve greatly the imaging contrast. The high gain, the wavelength-conversion, and the vortex pump push the imaging sensitivity to 25 photons.…”

Section: Introductionmentioning

confidence: 99%

Tunable Mid‐Infrared Detail‐Enhanced Imaging With Micron‐Level Spatial Resolution and Photon‐Number Resolving Sensitivity

Zeng

Wang

et al. 2023

Laser & Photonics Reviews

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The underdevelopment of mid‐infrared (MIR) components and detectors greatly limits the spatial resolution and sensitivity of MIR imaging. To overcome these limitations, MIR detail‐enhanced imaging is enhanced via non‐degenerate optical parametric amplification (OPA) pumped by a femtosecond vortex pulse. This design renders MIR illumination into a visible image by nonlinear wavelength‐conversion, together with a high OPA gain, large spatial bandwidth, and remarkable sensitivity. These experiments show that the design can realize MIR imaging with a spatial resolution of up to 114 line pairs per millimeter and a 2D spatial bandwidth product of up to 62 900, over a spectral region tunable from 2.0 to 3.0 µm. Equally important, this setup simultaneously achieves excellent imaging sensitivity of 25 photons at room temperature. It is thought that this work provides a powerful way to realize effective real‐time MIR imaging with an excellent spatial resolution even in very weak illumination environments, which can benefit many applications from semiconductor material characterization and biomedical imaging to security.

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Edge contrast enhancement of Fresnel incoherent correlation holography (FINCH) microscopy by spatial light modulator aided spiral phase modulation

Cited by 25 publications

References 31 publications

Incoherent Optoelectronic Differentiation Based on Optimized Multilayer Films

Incoherent Optoelectronic Differentiation Based on Optimized Multilayer Films

Review of Fresnel incoherent correlation holography with linear and non-linear correlations [Invited]

Tunable Mid‐Infrared Detail‐Enhanced Imaging With Micron‐Level Spatial Resolution and Photon‐Number Resolving Sensitivity

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