Ultralong focal length microlens array fabricated based on SU-8 photoresist

Bian, Rui; Xiong, Ying; Chen, Xiangyu; Xiong, Penghui; Hou, Shuangyue; Chen, Shan; Zhang, Xiaobo; Liu, Gang; Tian, Yangchao

doi:10.1364/ao.54.005088

Cited by 11 publications

(4 citation statements)

References 15 publications

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“…Therefore, based on previous studies on the parameters of reflowed‐photoresist microlenses (Ashraf et al, 2008; Pan & Su, 2008), a number of research efforts have been made to improve the fabrication process by thermal reflow of photoresist (Hsieh et al, 2011; Hsieh & Su, 2010; Jung & Jeong, 2015; Roy et al, 2009). Based on SU‐8 photoresist, Bian et al achieved an ultra‐long focal length of up to 4.4 mm through the large radius of curvature of the photoresist surface (Bian et al, 2015). Jucius et al (2016) changed the wettability of the substrate to achieve a change of contact angle in the range of 2°–76°, and obtained MLAs with different sizes.…”

Section: Microlenses Fabricating Techniquesmentioning

confidence: 99%

“…Jucius et al (2016) changed the wettability of the substrate to achieve a change of contact angle in the range of 2°–76°, and obtained MLAs with different sizes. MLAs prepared by thermal reflow of photoresist is suitable as a mold, and the fixed pattern is transferred to a material with better optical performance after copying and molding (Bian et al, 2015; Cherng & Su, 2014; Feng et al, 2012).…”

Section: Microlenses Fabricating Techniquesmentioning

confidence: 99%

“…A SU‐8 microlenses that can be used for cell counting has a surface roughness of only 10.2 nm and a NA as high as 0.75, and the good quality of the microlenses (Kuo, Hsieh, Yang, & Lee, 2007). Based on the surface tension of SU‐8, Bian et al produced a microlenses with a focal length of 4.4 mm when the heating temperature exceeded the glass transition temperature (Bian et al, 2015).…”

Section: Materials For Microlenses Fabricationmentioning

confidence: 99%

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Microlenses arrays: Fabrication, materials, and applications

Cai

Sun

Chu

et al. 2021

Microscopy Res & Technique

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Microlenses have become an indispensable optical element in many optical systems. The advancement of technology has led to a wider variety of microlenses fabrication methods, but these methods suffer from, more or less, some limitations. In this article, we review the manufacturing technology of microlenses from the direct and indirect perspectives. First, we present several fabrication methods and their advantages and disadvantages are discussed. Then, we discuss the commonly used materials for fabricating microlenses and the applications of microlenses in various fields. Finally, we point out the prospects for the future development of microlenses and their fabrication methods.

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Section: Microlenses Fabricating Techniquesmentioning

confidence: 99%

Section: Microlenses Fabricating Techniquesmentioning

confidence: 99%

Section: Materials For Microlenses Fabricationmentioning

confidence: 99%

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Microlenses arrays: Fabrication, materials, and applications

Cai

Sun

Chu

et al. 2021

Microscopy Res & Technique

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“…A large number of reports in the literature described the application of MLAs onto the light extraction of OLEDs, − a single photon source, , super-resolution imaging, upconversion luminescence, and ultrafast adaptive optics . MLAs can be fabricated by methods such as thermal photoresist reflow, − laser direct writing, , inkjet droplets, , self-assembly method, − optical μ-printing technology, and nanoimprint lithography . However, the research of MLAs for controlling scintillation luminescence is rare.…”

Section: Introductionmentioning

confidence: 99%

Directional Control and Enhancement of Light Output of Scintillators by Using Microlens Arrays

Yuan

Liu

Zhu

et al. 2020

ACS Appl. Mater. Interfaces

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Scintillators play an important role in the field of nuclear radiation detection, such as nuclear medical imaging, dark matter detection, nuclear physics experiments, and national security. However, the light extraction efficiency of a scintillator with a high refractive index is severely restricted because of the total internal reflection. In this paper, microlens arrays have been applied onto the surface of a cerium-doped lutetium−yttrium oxyorthosilicate scintillator to improve the light extraction efficiency and to control the directivity of the light output. Compared to that of a reference sample, a 3.26-fold enhancement with an emission angle of 45°has been obtained by using microlens arrays with optimal parameters. It was also found that the enhancement ratio can be affected by the refractive index of the microlens, the spacing of individual microlens. The control mechanism of microlens arrays is revealed by a combination of simulations and experiments. X-ray imaging characteristics exhibit an improved gray scale amplitude without any loss of the spatial resolution. The present results suggest that the application of microlens arrays to scintillators is beneficial to the field of nuclear radiation detection.

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Artificial Compound Eye with Tunable Properties for Enhancement in Fluorescence Imaging and Raman Detection

Kassim,

Lu,

Maeda

et al. 2024

Adv Funct Materials

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Artificial compound eye (CE) draws inspiration from nature, offering advanced imaging capabilities and an expansive field of view. In this work, an innovative technique is developed for the creation of CE with tunable dimensions. A solution‐based process is employed that involves in situ polymerization of surface nanodroplets prior to soft lithography to produce CE consisting of millions of ommatidia. The fabricated CE comprised of a densely arranged array of microwells, each with a base radius of 5 µm. Situated on a millimeter‐sized spherical dome, the CE can be tailored to arbitrary dimensions, enhancing its adaptability with a wide angular field of view up to 118°. The CE is used to enhance signal detection in fluorescent compounds, reaching a detection limit of 107 times lower concentration than that without using CEs in bulk solution. The signal enhancement capabilities are further utilized for surface‐enhanced Raman spectroscopy by using a portable handheld device, with an enhancement factor of 2. The fabrication technique underscores the advantages of the approach in simplicity, reproducibility, and efficiency in creating CE. The potential applications of CE may be extended to various domains, such as optical sensing, light‐dependent signal enhancement, motion perception, and medical endoscopy.

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Ultralong focal length microlens array fabricated based on SU-8 photoresist

Cited by 11 publications

References 15 publications

Microlenses arrays: Fabrication, materials, and applications

Microlenses arrays: Fabrication, materials, and applications

Directional Control and Enhancement of Light Output of Scintillators by Using Microlens Arrays

Artificial Compound Eye with Tunable Properties for Enhancement in Fluorescence Imaging and Raman Detection

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