Article
Optics
Mansoor A. Sultan, Fatih Balli, Daniel L. Lau, J. Todd Hastings
Summary: This work presents the design and fabrication of polymeric, structural optical filters that simultaneously focus light, representing a novel design at the boundary between diffractive optics and metasurfaces. Filters for visible and near-infrared wavelengths were designed using finite-difference time-domain (FDTD) simulations. Prototype filters fabricated using two-photon lithography show excellent agreement between experimental measurements and simulations.
Article
Engineering, Electrical & Electronic
Chuanlong Guan, Ran Zhang, Jinkui Chu, Ze Liu, Yuanyi Fan, Jianying Liu, Zhemin Yi
Summary: This study developed an integrated polarization sensor with real-time processing capability, utilizing specific fabrication processes and calibration methods to provide a reliable polarization image solution for various polarization devices.
IEEE SENSORS JOURNAL
(2022)
Article
Computer Science, Information Systems
Daewon Chung, Woon Cho, Inyeob Jeong, Joonhyeon Jeon
Summary: This paper proposes a new method for designing cutoff-frequency-fixing FIR filters by compensating for the cutoff-frequency error in MAXFLAT FIR filters. The method provides a closed-form Chebyshev polynomial to characterize the filters without cutoff error, allowing for computationally efficient and accurate design with flat magnitude characteristics. The approach demonstrates remarkable effectiveness in design efficiency and accuracy, offering significant advantages over previous works.
Article
Computer Science, Information Systems
Qiwei Xu, Xinghao Tong, Jiangwen Zhang, Xihua Wang
Summary: The solution processibility of colloidal quantum dots (CQDs) allows for direct integration with Si readout integrated circuits (Si-ROCIs), enabling the development of near-infrared (NIR) CMOS image sensors (CIS). This study investigates the feasibility of a NIR CIS based on CQD-Si heterojunction integration through simulation. The results demonstrate that each active pixel in the CQD-Si heterojunction photodiode on the CIS is highly responsive to NIR light, causing changes in electrostatic potentials that can be read out through integrated circuits.
Article
Engineering, Electrical & Electronic
Takaya Sugiura, Hiroki Miura, Nobuhiko Nakano
Summary: This study proposes a new UV-Ir compatible sensor fabricated using the standard CMOS process. The sensor is capable of detecting UV with high sensitivity and detecting IR by eliminating other wavelength regions using current rectification. It also has a high dynamic range, making it excellent for color sensing.
IEEE PHOTONICS JOURNAL
(2022)
Article
Optics
Xin He, Yajing Liu, Paul Beckett, Hemayet Uddin, Ampalavanapillai Nirmalathas, Ranjith R. Unnithan
Summary: The CMY color camera outperforms the RGB camera in low light conditions, but traditional CMY color filter technology is limited for next generation image sensors with submicron pixel sizes. A new nanoscale thick CMY color mosaic technology is introduced in this paper, with 820,000 color filter pixels, suitable for CMY camera and color imaging applications.
Article
Optics
Bozhi Wang, Yijing Xu, Zhipeng Wu, Zhiqing Zhang, Qilong Wang
Summary: The development of all-dielectric metasurfaces has greatly promoted the usage of optical metasurfaces in CMOS image sensors. Dielectric nanostructures, with their tunability and resonant behavior, have the potential to replace conventional color filters. This paper adopts a GMR mode based on all-dielectric metasurfaces as an example to study the impact of application scenarios and manufacturing mistakes on the filter. Numerical calculations are used to analyze the relationship between the robustness of metasurfaces and optical resonant modes. Moreover, a method simplifying manufacturing mistakes during FDTD simulation is proposed. This work enhances our understanding of all-dielectric metasurfaces and their application in CMOS image sensors.
OPTICS COMMUNICATIONS
(2023)
Article
Multidisciplinary Sciences
Zheng Li, Jin Xue, Marc de Cea, Jaehwan Kim, Hao Nong, Daniel Chong, Khee Yong Lim, Elgin Quek, Rajeev J. Ram
Summary: In this letter, an electrically driven Si light-emitting diode with a sub-wavelength emission area is reported. It has a high spatial intensity of >50 mW/cm² and exhibits a high degree of spatial coherence due to sub-wavelength confinement. This on-chip light source can be used in integrated photonics systems.
NATURE COMMUNICATIONS
(2023)
Article
Green & Sustainable Science & Technology
Hosang Hyun, Hyung-Geun Kim, Jin-Sung Kim
Summary: Off-site construction (OSC) is a promising method to improve construction efficiency, but inexperienced use can result in design errors and conflicts. To address these issues, design for manufacturing and assembly (DfMA) is widely used in the OSC design process. This study proposes a comprehensive OSC design process by integrating fragmented DfMA considerations and validates it through a case study.
Article
Chemistry, Analytical
Mukul Sarkar, Maher Assaad
Summary: This research proposes a reflexive mode polarized imaging-based iPPG method, which can monitor changes in heart rate and blood oxygen saturation in real time. The quantitative analysis of reflective information from superficial and deep layers of skin is achieved using phase information, providing real-time results of heart rate and SpO(2). This method has the advantages of non-contact, compactness, and portability.
Article
Engineering, Electrical & Electronic
Jonathan Ch. James, Terence L. Haran, Sarah E. Lane
Summary: This paper investigates the infrared detector technologies based on III-V semiconductors, including strained-layer superlattice, quantum well infrared photodetectors, and quantum dot infrared photodetectors. Compared to traditional high-performance detector technology (mercury/cadmium/telluride), these technologies provide greater flexibility in engineering bandgap or spectral response cut-offs. The choice of detector cut-off depends on the desired performance within a range of operational scenarios and specific environmental backgrounds and atmospheric conditions. This paper explores the impact of detector cut-off wavelength on performance metrics such as noise equivalent temperature difference, expected target detection or identification ranges, and reviews the relationships between cut-off wavelength and other detector performance characteristics.
OPTO-ELECTRONICS REVIEW
(2023)
Article
Engineering, Environmental
Feika Bian, Hanxu Chen, Lingyu Sun, Ning Li, Yuanjin Zhao
Summary: This article presents a novel AIEgens-integrated structural color barcode for binary screening of miRNAs, which can provide stable structural colors and variable fluorescence signals. The barcode enables the multiplexed screening of miRNAs in a microfluidics device, showing great potential in biomedical fields.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Electrical & Electronic
Sangeeta D. Palekar, Jayu Kalambe, Rajendra M. Patrikar
Summary: A fully integrated biochemical sensing platform has been developed, providing reliability, portability, and accuracy in blood analysis. By replacing hardware dependencies with software solutions, the platform offers extreme flexibility and high precision.
IEEE SENSORS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Yves Audet, Abdelhalim Bendali, Jean-Pierre David
Summary: A novel photodetector for imaging in the visible-near infrared range has been investigated, utilizing the wavelength-dependent absorption property of semiconductor materials for spectral discrimination without the need for thin-film filters. The detector features multiple collectors separated by polysilicon gates, each with a different spectral response established through proper voltage biasing to create a color detection space. Experimental results demonstrate the color detection capability of the detector, fabricated using a standard 0.35 μm CMOS process with a peak combined collectors' responsivity of 0.35 A/W.
IEEE TRANSACTIONS ON ELECTRON DEVICES
(2021)
Article
Computer Science, Information Systems
Bohyeok Jeong, Jaehwan Lee, Jaihyuk Choi, Minkyu Song, Youngdoo Son, Soo Youn Kim
Summary: This article presents a high-performance, low-power analog convolutional neural network (CNN) circuit integrated into a CMOS image sensor (CIS) for face detection applications. The proposed circuit consists of an analog multiplication-and-accumulation (MAC) circuit, which enables the programmable weight function. A 3-layer analog CNN processor is implemented into the column-parallel readout circuit in conventional CIS. The use of a low-resolution analog-to-digital converter with a nonlinear quantization method increases the accuracy of face detection.
