Coherence properties of different light sources and their effect on the image sharpness and speckle of holographic displays

Deng, Yuanbo; Chu, Daping

doi:10.1038/s41598-017-06215-x

Cited by 159 publications

(98 citation statements)

References 36 publications

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“…Another important factor is the spatial coherence of the LED source, which has been discussed in detail in reference [26]. According to the results, the size of the LED cannot be too big; otherwise, the reconstructed image will be not sharp due to the low degree of spatial coherence.…”

Section: Discussionmentioning

confidence: 97%

Faceted Fresnel DOEs creating the perception of a floating 3D virtual object under divergent illumination

Song

Pigeon

Heggarty

2019

Optics Communications

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An approach for the optimization and fabrication of a phase-only faceted Fresnel type diffractive optical element (FDOE) creating 3D virtual object is proposed. The FDOE is a transmissive Fresnel type DOE array, which produces the perception of a customized floating 3D virtual object behind the FDOE when illuminated with a divergent monochromatic Light Emitter Diode (LED) source. Each DOE unit of the FDOE is optimized by a modified iterative Fourier transform algorithm (M-IFTA). Every unit of the FDOE locally deflects the incident light to the same position to form a designated view in the target plane. The FDOE is fabricated using our home-built parallel writing photo-lithography machine. Numerical simulations and optical experiments are performed to verify the proposed design method. This work may find important applications in the advanced design of optical security hologram and anti-counterfeiting component.

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Section: Discussionmentioning

confidence: 97%

Faceted Fresnel DOEs creating the perception of a floating 3D virtual object under divergent illumination

Song

Pigeon

Heggarty

2019

Optics Communications

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“…Angular modulation was achieved using the 680 nm SLED, generating light that is focused into the objective BFP, resulting in an illuminating beam at the sample of an adjustable, narrow range of angles. A SLED was used over a laser or LED because they have a high spatial coherence but a low temporal coherence, allowing the output to be focused to a very tight spot [27,28], without suffering from the effects of laser speckling [29]. Additionally, SLEDs have extremely low noise [30], which is advantageous in the high-speed acquisition of rapid signals such as electrical activity in cells.…”

Section: Optical System Designmentioning

confidence: 99%

Surface Plasmon Resonance Imaging of Excitable Cells

Howe

Webb

Abayzeed

et al. 2018

Preprint

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Surface plasmons are highly sensitive to refractive index variations adjacent to the surface. This sensitivity has been exploited successfully for chemical and biological assays. In these systems, a surface plasmon resonance (SPR)-based sensor detects temporal variations in the refractive index at a point. SPR has also been used in imaging systems where the spatial variations of refractive index in the sample provide the contrast mechanism. A high numerical aperture objective lens has been used to design SPR microscopy systems with the ability to image adherent live cells. Addressing research questions in cell physiology and pharmacology often requires the development of a multimodal microscope where complementary information can be obtained. In this paper, we present the development of a multimodal microscope that combines surface plasmon resonance imaging with a number of additional imaging modalities including brightfield, epi-fluorescence, total internal reflection microscopy (TIRM) and SPR fluorescence microscopy. We used a high numerical aperture objective lens to achieve SPR and TIR microscopy with the ability to image adherent live cells non-invasively. The platform has been used to image live cell cultures demonstrating both fluorescent and label-free techniques. The SPR and TIR imaging systems feature a wide field of view (300 µm) that allows measurements from multiple cells while the resolution is sufficient to image fine cellular processes. The ability of the platform to perform label-free functional imaging of living cell was demonstrated by imaging the spatial variations in contraction of stem cellderived cardiomyocytes. This technique has a promise for non-invasive imaging of the development of cultured cells over very long periods of time.

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“…The combination of the coherent illumination and the SLM enables the displays to reconstruct volumetric objects, and corrects the optical aberration accompanied by optical elements 3 . Holographic displays are versatile, which have been studied from several perspectives: display applications including near-eye displays 2 – 4 , tabletop displays 15 , 16 , and projection-type displays 17 ; spatial-bandwidth product improvement using a scattering 18 or non-periodic 19 medium; and speckle analysis of holographic displays according to light sources 20 . In the near-eye display field, a lightweight glasses-like optical design was introduced 3 , 4 , 21 , which supports a large field of view, high resolution, and accurate focus cues.…”

Section: Introductionmentioning

confidence: 99%

Light source optimization for partially coherent holographic displays with consideration of speckle contrast, resolution, and depth of field

Lee

Kim

Nam

et al. 2020

Sci Rep

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Speckle reduction is an important topic in holographic displays as speckles not only reduce signal-to-noise ratio but also possess an eye-safety issue. Despite thorough exploration of speckle reduction methods using partially coherent light sources, the trade-off involved by the partial coherence has not been thoroughly discussed. Here, we introduce theoretical models that quantify the effects of partial coherence on the resolution and the speckle contrast. The theoretical models allow us to find an optimal light source that maximizes the speckle reduction while minimizing the decline of the other terms. We implement benchtop prototypes of partially coherent holographic displays using the optimal light source, and verify the theoretical models via simulation and experiment. We also present a criterion to evaluate the depth of field in partially coherent holographic displays. We conclude with a discussion about approximations and limitations inherent in the theoretical models.

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Coherence properties of different light sources and their effect on the image sharpness and speckle of holographic displays

Cited by 159 publications

References 36 publications

Faceted Fresnel DOEs creating the perception of a floating 3D virtual object under divergent illumination

Faceted Fresnel DOEs creating the perception of a floating 3D virtual object under divergent illumination

Surface Plasmon Resonance Imaging of Excitable Cells

Light source optimization for partially coherent holographic displays with consideration of speckle contrast, resolution, and depth of field

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