Disturbance-free digital holographic microscopy via a micro-phase-step approach

Chang, Chi-Ching; Shiu, Ming-Tzung; Wang, Je-Chung; Wu, Chien-Sheng; Chew, Yang-Kun

doi:10.1016/j.optlaseng.2014.12.009

Cited by 8 publications

(7 citation statements)

References 34 publications

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“…A spatial filter (SF) in the reference arm was used to match the quadratic phase term associated with the object beam [25]. A glass plate with a thickness of 177 µm and refractive index of 1.52 was placed in the reference arm as phase object for arbitrary micro-phase shifting technique [26]. The object and reference beam were merged using a beam splitter (BS), and the hologram was recorded by a CCD (Pixera-150SS, 1040 ×1392 pixels, 0.484 × 0.650 cm 2 ).…”

Section: Methodsmentioning

confidence: 99%

Image fidelity improvement in digital holographic microscopy using optical phase conjugation

Chan

Chew

Shiu

et al. 2018

Optics and Lasers in Engineering

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digital holography, techniques in suppressing noises derived from reference arm are maturely developed. However, techniques for the object counterpart are not being well developed. Optical phase conjugation technique was believed to be a promising method for this interest. A 0°-cut BaTiO3 photorefractive crystal was involved in self-pumped phase conjugation scheme, and was employed to in-line digital holographic microscopy, in both transmission-type and reflection-type configuration. On pure physical compensation basis, results revealed that the image fidelity was improved substantially with 2.9096 times decrease in noise level and 3.5486 times increase in the ability to discriminate noise on average, by suppressing the scattering noise prior to recording stage.

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Section: Methodsmentioning

confidence: 99%

Image fidelity improvement in digital holographic microscopy using optical phase conjugation

Chan

Chew

Shiu

et al. 2018

Optics and Lasers in Engineering

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“…We used the angular spectrum method perform numerical reconstruction. IDFDHM is based on two techniques that we developed previously: arbitrary phase shifting [8] and virtual lens compensation [7]. The virtual lens compensatio nique suppresses the quadratic phase term by using two waves that have the same ratic phase term.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…θ and 2 θ ′ , respectively. If the angle of incidence of the incident light is kn can be changed by rotating the phase object; the amount of phase modulation in erence wave (Equation ( 4)) can be further derived from the optical path difference IDFDHM is based on two techniques that we developed previously: arbitrary microphase shifting [8] and virtual lens compensation [7]. The virtual lens compensation technique suppresses the quadratic phase term by using two waves that have the same quadratic phase term.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…Moreover, the edges and background are clearly distinguishable, without a information. IDFDHM uses an arbitrary micro-phase-shift modulation method [8] to achieve destructive interference between the object light and reference light. The main method is to change the phase of the reference light to achieve destructive interference by using phase shift technology.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…Hence, in the past few decades, there have been attempts to suppress intrinsic noise in DHM. Various methods have been proposed to eliminate the interference of the zero-order, conjugate, and quadratic phase terms [3][4][5][6][7][8]. DHM has been widely used to observe biological cells [9,10], such as cancer cells and E. coli cells, or to observe the mechanical elements in industrial applications [11,12].…”

Section: Introductionmentioning

confidence: 99%

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Image Contrast Improvement in Interference-Dark-Field Digital Holographic Microscopy

et al. 2021

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Conventional dark-field digital holographic microscopy (DHM) techniques require the use of specialized optics, and, thus, obtaining dark-field images with high contrast has a high cost. Herein, we propose a DHM system that uses an interference-dark-field technique for improving image contrast. Unlike conventional dark-field DHM, the proposed technique does not require expensive and specialized optical elements, or a complicated optical setup, to obtain dark-field images. The proposed technique employs a pure optical basis method to suppress scattering noise—namely, interference-dark-field—and mainly adopts an arbitrary micro-phase shifting method to achieve destructive interference for obtaining holograms. Under the framework of the proposed technique and through the observation of the USAF 1951 resolution target, the reconstructed image can retain the high contrast of the interference-dark-field DHM. The image contrast is enhanced by at least 43% compared to that which is obtained by conventional dark-field DHM. The resolution of the system can be as high as 0.87 μm. The proposed technique can switch between bright-field and dark-field DHM and prevents damage to the sample, which results from high-intensity illumination in conventional techniques.

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Noise suppression using quasi-phase conjugation in digital holographic microscopy

Chang

Chan

Shiu

et al. 2021

Optics Communications

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Disturbance-free digital holographic microscopy via a micro-phase-step approach

Cited by 8 publications

References 34 publications

Image fidelity improvement in digital holographic microscopy using optical phase conjugation

Image fidelity improvement in digital holographic microscopy using optical phase conjugation

Image Contrast Improvement in Interference-Dark-Field Digital Holographic Microscopy

Noise suppression using quasi-phase conjugation in digital holographic microscopy

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