Manufacturing of Compound Parabolic Concentrator Devices Using an Ultra-fine Planing Method for Enhancing Efficiency of a Solar Cell

Choi, Hak Jong; Cho, Changsoon; Woo, Sang-Won; Lee, Jung‐Yong; Yoo, Yeong-Eun; Jeon, Minwoo; Kim, Geon-Hee; Je, Tae-Jin; Jeon, Eun‐chae

doi:10.1007/s40684-020-00287-3

Cited by 8 publications

(5 citation statements)

References 24 publications

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“…The surface quality and dimensional accuracy of the 3D‐printed samples are comparable to those made by conventional optics fabrication methods. [ 44 ] Therefore, zooming‐focused MIP‐VPP makes it possible to fabricate high‐quality optical lenses rapidly.…”

Section: Resultsmentioning

confidence: 99%

Continuous Vat Photopolymerization for Optical Lens Fabrication

Han

Chen

et al. 2023

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Optical lenses require feature resolution and surface roughness that are beyond most (3D) printing methods. A new continuous projection‐based vat photopolymerization process is reported that can directly shape polymer materials into optical lenses with microscale dimensional accuracy (< 14.7 µm) and nanoscale surface roughness (< 20 nm) without post‐processing. The main idea is to utilize frustum layer stacking, instead of the conventional 2.5D layer stacking, to eliminate staircase aliasing. A continuous change of mask images is achieved using a zooming‐focused projection system to generate the desired frustum layer stacking with controlled slant angles. The dynamic control of image size, objective and imaging distances, and light intensity involved in the zooming‐focused continuous vat photopolymerization are systematically investigated. The experimental results reveal the effectiveness of the proposed process. The 3D‐printed optical lenses with various designs, including parabolic lenses, fisheye lenses, and a laser beam expander, are fabricated with a surface roughness of 3.4 nm without post‐processing. The dimensional accuracy and optical performance of the 3D‐printed compound parabolic concentrators and fisheye lenses within a few millimeters are investiagted. These results highlight the rapid and precise nature of this novel manufacturing process, demonstrating a promising avenue for future optical component and device fabrication.

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Section: Resultsmentioning

confidence: 99%

Continuous Vat Photopolymerization for Optical Lens Fabrication

Han

Chen

et al. 2023

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“…Energy-harvesting devices also require bifunctional surfaces. For example, the light scattering caused by fog droplets and foulant contamination on the solar panels decrease the energy conversion efficiency; therefore, a bifunctional surface with antifogging and antifouling properties can be used to address these problems. , …”

Section: Resultsmentioning

confidence: 99%

“…For example, the light scattering caused by fog droplets and foulant contamination on the solar panels decrease the energy conversion efficiency; therefore, a bifunctional surface with antifogging and antifouling properties can be used to address these problems. 43,44 Figure 2a illustrates the fabrication procedure of the nanostructured OA-PEG copolymer. First, PEGDMA and OA were mixed at 70 °C.…”

Section: Resultsmentioning

confidence: 99%

Bifunctional Amphiphilic Nanospikes with Antifogging and Antibiofouling Properties

Lee

Kang

Jang

et al. 2022

ACS Appl. Mater. Interfaces

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Over the past few decades, extensive research efforts have been devoted to developing surfaces with unique functionalities, such as controlled wettability, antibiofouling, antifogging, and anti-icing behavior, for applications in a wide range of fields, including biomedical devices, optical instruments, microfluidics, and energy conservation and harvesting. However, many of the previously reported approaches have limitations with regard to eco-friendliness, multifunctionality, long-term stability and efficacy, and cost effectiveness. Herein, we propose a scalable bifunctional surface that simultaneously exhibits excellent antifogging and antibiofouling properties based on the synergistic integration of an eco-friendly and bio-friendly polyethylene glycol (PEG) hydrogel, oleamide (OA), and nanoscale architectures in a single flexible platform. We demonstrate that the PEG-OA-nanostructure hybrid exhibits excellent antifogging performance owing to its enhanced water absorption and spreading properties. We further show that the triple hybrid exhibits notable biofilm resistance without the use of toxic biocides or chemicals by integrating the “fouling-resistant” mechanism of the PEG hydrogel, the “fouling-release” mechanism of OA, and the “foulant-killing” mechanism of the nanostructures.

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“…However, the imaging receivers suggest a more compact design, still with a reasonable FOV compared to the non-imaging counterparts. Furthermore, aspheric lenses are available commercially from small diameters (few millimeters) to large diameters (tens of centimeters), while the range of CPC is limited due to less commercial demand [54].…”

Section: Comparison Between Imaging and Non-imaging Receiversmentioning

confidence: 99%

High-Speed Imaging Receiver Design for 6G Optical Wireless Communications: A Rate-FOV Trade-Off

Soltani

Kazemi

Sarbazi

et al. 2023

IEEE Trans. Commun.

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The design of a compact high-speed and wide field of view (FOV) receiver is challenging due to the presence of two well-known trade-offs. The first one is the area-bandwidth trade-off of photodetectors (PDs) and the second one is the gain-FOV trade-off due to the use of optics. The combined effects of these two trade-offs imply that the achievable data rate of an imaging optical receiver is limited by its FOV, i.e., a rate-FOV trade-off. In this paper, we propose an imaging receiver design in the form of an array of (PD) arrays. To control the area-bandwidth trade-off, small PDs are used in an array of arrays structure instead of a single large PD. Moreover, to achieve a reasonable receiver FOV, we use an array of focusing lenses that focus the light individually on each inner PD array. The proposed array of arrays structure provides an effective method to control both gain-FOV trade-off (via an array of lenses) and area-bandwidth trade-off (via arrays of small PDs). We first derive a tractable analytical model for the signal-to-noise ratio (SNR) of an array of PDs that is equipped with a focusing lens assuming maximum ratio combining (MRC). Then, we extend the model to the proposed array of arrays structure and the accuracy of the analytical model is verified based on several Optic Studio-based simulations. Next, we formulate an optimization problem to maximize the achievable data rate of the imaging receiver subject to a minimum required FOV. The optimization problem is solved for two commonly used modulation techniques, namely, on-off keying (OOK) and direct current (DC) biased optical orthogonal frequency division multiplexing (DCO-OFDM) with variable rate quadrature amplitude modulation (QAM). Our results show the limits of high speed wide-FOV imaging receivers that can support mobility. For example, it is demonstrated that a data rate of ∼ 24 Gbps with a FOV of 15 • is achievable using OOK with a total receiver size of 2 cm × 2 cm.

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Manufacturing of Compound Parabolic Concentrator Devices Using an Ultra-fine Planing Method for Enhancing Efficiency of a Solar Cell

Cited by 8 publications

References 24 publications

Continuous Vat Photopolymerization for Optical Lens Fabrication

Continuous Vat Photopolymerization for Optical Lens Fabrication

Bifunctional Amphiphilic Nanospikes with Antifogging and Antibiofouling Properties

High-Speed Imaging Receiver Design for 6G Optical Wireless Communications: A Rate-FOV Trade-Off

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