Fabrication of Integrated Lensless Cameras via UV-Imprint Lithography

Lee, Yujin; Chae, Hyesuk; Lee, Kyung Chul; Baek, Nakkyu; Kim, Tae‐Young; Jung, Jaewoo; Lee, Seung Ah

doi:10.1364/cosi.2022.cth4c.7

Cited by 2 publications

(2 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The holographic diffuser has relief structures on the surface, which are pseudo-random and non-periodic [10,11]. These structures can manipulate light by changing the direction of its energy.…”

Section: Light Field Imaging Through Segmentation Of Psfmentioning

confidence: 99%

Lensless light field imaging with angular resolution improvement

Cai

et al. 2023

International Conference on Optical and Photonic Engineering (icOPEN 2022)

View full text Add to dashboard Cite

Lensless light-field imaging is the process to encode the light field information of object through an optical encoder, and then recover the light field information of object through a reconstruction algorithm. In traditional lens-based light field imaging, each microlens in microlens-array corresponds to an angular sampling, and it needs to adjust the microlensarray to alter the angular resolution. In this paper, a commercial holographic diffuser is used as an optical encoder, and a flexible overlapping segmentation method of angular sampling is proposed for the point spread function (PSF). The surface microstructures of holographic diffuser allow any region of it to encode and recover light information of object independently, corresponding to an angular sampling. Calibration of PSF for the lensless imaging system is done firstly, and encoded image of object is captured; then the PSF is divided into different regions as sub-PSFs, corresponding to different angular samplings; after that, light field images of object is reconstructed with corresponding sub-PSFs through reconstruction algorithm; with these light field images, digital refocusing can be achieved finally. Different from evenly segmentation of angular sampling in microlens-array, the overlapping segmentation method divides PSF into sub-PSFs while adjacent sub-PSFs overlap each other. This improves angular resolution of imaging system and ensures low error in reconstruction of light field images. Experiments show that, the overlapping segmentation method can guarantee the reconstruction accuracy of lensless light-field imaging system while flexibly adjusting and improving the angular resolution.

show abstract

Section: Light Field Imaging Through Segmentation Of Psfmentioning

confidence: 99%

Lensless light field imaging with angular resolution improvement

Cai

et al. 2023

International Conference on Optical and Photonic Engineering (icOPEN 2022)

View full text Add to dashboard Cite

show abstract

“…To overcome this issue, nanoimprinting lithography (NIL) has been proposed as a novel technique in which the fabricated patterns and components are the potential candidates for application in optical devices, micro-integration systems, nanomold production, and biological devices [4,5]. In this method, a mechanical deformation process is conducted to transfer the pattern onto the metallic flms by an imprinting-release procedure [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Mechanism of Imprinting Process in the Ni-P Metallic Glass Films: A Molecular Dynamics Study

Riyadi

Sivaraman

Wais³

et al. 2023

Advances in Materials Science and Engineering

View full text Add to dashboard Cite

In this study, the molecular dynamics (MD) simulation was used to evaluate the role of imprinting temperature and the mold-cavity geometry on the imprinted Ni-P metallic glass (MG) films. Considering the outcomes of simulation, it was found that the tip-like and groove patterns showed different filling time for the imprinting process. At room temperature (300 K), the plastic deformation in the tip-like pattern was in a ring shape enclosing the mold, while the plastic deformation in the groove-pattern geometry was mainly localized at the wall of mold. Moreover, it was determined that the imprinting at high temperature (700 K) led to the shortening of pattern filling time and the decrease of loading force in both geometries. The strain concentration and localized plastic deformation were also removed in the high-temperature imprinting process. On the other hand, the unloading process at room temperature (300 K) improved the imprinting quality due to the lower elastic recovery.

show abstract

Fabrication of Integrated Lensless Cameras via UV-Imprint Lithography

Abstract: We present a design and construction of a lensless camera where the phase-modulating mask is integrated directly on a sensor using the UV-imprint lithography. Our method delivers a rigid device with a small form-factor.

Cited by 2 publications

References 2 publications

Lensless light field imaging with angular resolution improvement

Lensless light field imaging with angular resolution improvement

Mechanism of Imprinting Process in the Ni-P Metallic Glass Films: A Molecular Dynamics Study

Contact Info

Product

Resources

About