Compact relay lenses using microlenslet arrays

Shaoulov, Vesselin; Rolland, Jannick P.

doi:10.1117/12.486485

Cited by 5 publications

(4 citation statements)

References 3 publications

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“…In the case of optically created special effects, the images created will be highly distorted and blurred by optical phase plates inserted out of focus within the relay optics to generate images modified with special effects such as painterly effects. 1,10 In such an imaging framework, resolution is not a key qualifier of Fig. 8.…”

Section: Discussion and Future Researchmentioning

confidence: 99%

“…Real-time special effects in photography and moviemaking will benefit from the design of compact relay lenses. 1,2 Recent progress in micro-optics fabrication offers a potential new solution based on microlenslet arrays. The basic theory of imaging with microlenslet arrays, developed by Anderson, was driven by requirements of optical scanning devices.…”

Section: Introductionmentioning

confidence: 99%

“…This research expands on an earlier investigation reported at the International Optical Design Conference ͑2002͒ where we showed the capability of microlenses to form gray-scale images. 1 New material presented in this paper includes a comprehensive optimization of ray tracing for maximum efficiency, a SNR analysis, a quantification of lensletization, and a discussion of compactness and image quality degradations caused by diffraction and optical aberrations.…”

Section: Introductionmentioning

confidence: 99%

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Design and assessment of microlenslet-array relay optics

Shaoulov

Rolland

2003

Appl. Opt.

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Recent progress in micro-optics fabrication and optical modeling software opens the opportunity to investigate how microlenslet-array-based compact relay systems can be designed and assessed. We present various optical configurations that include an appropriate baffle computation to eliminate ghost images, followed by an analysis of image quality. The investigation shows the existing trade-off between compactness of the system and a tiling effect observed in the corresponding image, an effect we refer to as lensletization. To yield meaningful optical modeling results, we provide insight into ray-tracing optimization while ensuring a sufficient signal-to-noise ratio. The results show that, given no discernable lensletization, the most compact configuration to image gray-scale images is the 5f-based system. Finally, simulations of the imaging of gray scale and color bitmaps through microlenslet arrays are demonstrated for the first time to our knowledge.

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Section: Discussion and Future Researchmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design and assessment of microlenslet-array relay optics

Shaoulov

Rolland

2003

Appl. Opt.

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“…The entire 3-30 cm 2 surface area of these cavities need to be rapidly imaged (<1 min) by a small, highly maneuverable imager with the ability to detect about 100 to 1000 cancer cells, necessitating imaging speeds of up to 0.5 cm 2 /s. Miniaturized optical elements are difficult to fabricate and they often suffer from increased aberrations and other issues such as ghost images [27][28][29]. Goggle-based approaches [30,31] are easier to use, but suffer from low sensitivity due to the distance from the tumor bed and cannot image the complex tumor cavity sidewalls.…”

Section: Introductionmentioning

confidence: 99%

Real-time cancer detection with an integrated lensless fluorescence contact imager

Papageorgiou

Zhang

Giverts

et al. 2018

Biomed. Opt. Express

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Microscopic tumor cell foci left in a patient after surgery significantly increase the chance of cancer recurrence. However, fluorescence microscopes used for intraoperative navigation lack the necessary sensitivity for imaging microscopic disease and are too bulky to maneuver within the resection cavity. We have developed a scalable chip-scale fluorescence contact imager for detecting microscopic cancer in vivo and in real-time. The imager has been characterized under simulated in vivo conditions using ex vivo samples, providing strong evidence that our device can be used in vivo. Angle-selective gratings enhance the resolution of the imager without impacting its physical size. We demonstrate detection of cancer cell clusters containing as few as 25 HCC1569 breast cancer cells and 400 LNCaP prostate cancer cells with integration times of only 50 ms and 70 ms, respectively. A cell cluster recognition algorithm is used to achieve both a sensitivity and specificity of 92 % for HCC1569 cell samples, indicating the reliability of the imager. The signal-to-noise ratio (SNR) degradation with increased separation is only 1.5 dB at 250 µm. Blood scattering and absorption reduce the SNR by less than 2 dB for typical concentrations. Moreover, HER2+ breast cancer tissue taken from a patient is distinguished from normal breast tissue with an integration time of only 75 ms.

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Researches on the development of an optical system for improving the efficiency of photovoltaic panels

Rizescu

Alionte

2020

E3S Web Conf.

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The paper aims to create a unit using Fresnel lenses. This module consist of an arrangement of planar-convex Fresnel lenses, made of methyl polymethacrylate, mounted in a hexagonal raster and bent to form a dome for collecting and amplifying solar radiation at several focal points and with the possibility of adjusting the focal distance. The module has three aluminum alloy legs that are vertically adjustable. This construction using Fresnel lenses mounted in a hexagonal raster will increase the energy collected by a photovoltaic panel, thus significantly reducing energy losses and long-term costs. Compared to normal lenses, these lenses are considerably lighter because the material in the center of the lens is reduced, and for manufacturing can be used methyl polymethacrylate or polycarbonate, thus greatly reducing manufacturing costs. To show the functioning of the unit the authors presents in the paper a MATLAB simulation of the Fresnel lens model and a ray propagation.

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Compact relay lenses using microlenslet arrays

Cited by 5 publications

References 3 publications

Design and assessment of microlenslet-array relay optics

Design and assessment of microlenslet-array relay optics

Real-time cancer detection with an integrated lensless fluorescence contact imager

Researches on the development of an optical system for improving the efficiency of photovoltaic panels

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