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

Yuan, Di; Liu, Bo; Zhu, Zhichao; Guo, Yaozhen; Cheng, Chuanwei; Chen, Hong; Gu, Ming; Xu, Mengxuan; Chen, Liang; Liu, Jinliang; Ouyang, Xiaoping

doi:10.1021/acsami.0c06779

Cited by 17 publications

(18 citation statements)

References 42 publications

(48 reference statements)

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“…Recently, LYSO structured scintillator with a monolayer of micro lens array was demonstrated by Liu and co‐workers. [ 111 ] PS microspheres with different diameters (1, 2, and 4.5 µm) were dispersed on silicon wafer to form a monolayer and then transferred to the surface of LYSO crystal. Array size can reach 10 × 20 mm 2 , and a 3.26 times enhancement of radioluminescence with an emission angle of 45° can be observed.…”

Section: Array‐derived Structured Scintillatorsmentioning

confidence: 99%

Structured Scintillators for Efficient Radiation Detection

Lin

Yang

et al. 2021

Advanced Science

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Scintillators, which can convert high‐energy ionizing radiation into visible light, have been serving as the core component in radiation detectors for more than a century of history. To address the increasing application demands along with the concern on nuclear security, various strategies have been proposed to develop a next‐generation scintillator with a high performance in past decades, among which the novel approach via structure control has received great interest recently due to its high feasibility and efficiency. Herein, the concept of “structure engineering” is proposed for the exploration of this type of scintillators. Via internal or external structure design with size ranging from micro size to macro size, this promising strategy cannot only improve scintillator performance, typically radiation stopping power and light yield, but also extend its functionality for specific applications such as radiation imaging and therapy, opening up a new range of material candidates. The research and development of various types of structured scintillators are reviewed. The current state‐of‐the‐art progresses on structure design, fabrication techniques, and the corresponding applications are discussed. Furthermore, an outlook focusing on the current challenges and future development is proposed.

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Section: Array‐derived Structured Scintillatorsmentioning

confidence: 99%

Structured Scintillators for Efficient Radiation Detection

Lin

Yang

et al. 2021

Advanced Science

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“…The external quantum efficiency was significantly increased from 8.6 to 14.1% and the maximum luminous efficiency is 24.8 lm/W. Yuan et al put MLA on the surface of scintillator to improve the light extraction efficiency and MLA also has a great contribution to control the directivity of light output (Yuan et al, 2020). Besides, due to nonlinear response to the excitation irradiance of MLAs, Liu et al employed MLAs as spatial light modulators to manipulate the distribution of excitation light fields in order to increase upconversion luminescence (Liu et al, 2019).…”

Section: Applications Of Microlensesmentioning

confidence: 99%

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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“…However, the luminous intensity from LEDs dramatically decreases as the light propagates due to the emission of diverging spherical waves [ 64 ]. The intensity of light extraction efficiency of LEDs has been enhanced using microlens arrays [ 65 , 66 , 67 ], surface roughening [ 68 , 69 , 70 , 71 ], photonic crystal patterning [ 72 , 73 ], patterned substrates [ 74 , 75 ], and surface plasmons [ 76 , 77 , 78 ]. However, metasurfaces including MLs are difficult to use for LED sources, as the emitted light is incoherent [ 79 , 80 ].…”

Section: Introductionmentioning

confidence: 99%

Enhancement of Luminous Intensity Emission from Incoherent LED Light Sources within the Detection Angle of 10° Using Metalenses

et al. 2022

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In this work, we present metalenses (MLs) designed to enhance the luminous intensity of incoherent light-emitting diodes (LEDs) within the detection angles of 0° and 10°. The detection angle of 0° refers to the center of the LED. Because the light emitted from LEDs is incoherent and expressed as a surface light source, they are numerically described as a set of point sources and calculated using incoherent summation. The titanium dioxide (TiO2) and amorphous silicon (a-Si) nanohole meta-atoms are designed; however, the full 2π phase coverage is not reached. Nevertheless, because the phase modulation at the edge of the ML is important, an ML is successfully designed. The typical phase profile of the ML enhances the luminous intensity at the center, and the phase profile is modified to increase the luminous intensity in the target detection angle region. Far field simulations are conducted to calculate the luminous intensity after 25 m of propagation. We demonstrate an enhancement of the luminous intensity at the center by 8551% and 2115% using TiO2 and a-Si MLs, respectively. Meanwhile, the TiO2 and a-Si MLs with the modified phase profiles enhance the luminous intensity within the detection angle of 10° by 263% and 30%, respectively.

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

Cited by 17 publications

References 42 publications

Structured Scintillators for Efficient Radiation Detection

Structured Scintillators for Efficient Radiation Detection

Microlenses arrays: Fabrication, materials, and applications

Enhancement of Luminous Intensity Emission from Incoherent LED Light Sources within the Detection Angle of 10° Using Metalenses

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