This paper extends a method previously applied to the determination of the optical constants of a high-index thin film to a dielectric bilayer. This method is based on the time recording of the spectral transmittance of the stack during its deposition with the help of an in situ broadband monitoring system.
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http://dx.doi.org/10.1364/AO.57.000877 | DOI Listing |
Adv Mater
December 2024
School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, 150001, China.
Broadband photodetectors (PDs) have garnered significant attention due to their ability to detect optical signals across a wide wavelength range, with applications spanning military reconnaissance, environmental monitoring, and medical imaging. However, existing broadband detectors face several practical challenges, including limited detection range, uneven photoresponse, and difficult to distinguish multispectral signals. To address these limitations, this study presents a self-powered ultra-wide PD based on the BiSe/AlInAsSb heterojunction.
View Article and Find Full Text PDFTalanta
December 2024
School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, China. Electronic address:
Nitrous acid (HONO) is crucial in atmospheric chemistry as it is a major precursor for hydroxyl radicals (OH), the dominant atmospheric oxidant. Hydroxyl radicals are essential in the formation of secondary air pollutants like ozone and particulate matter. This study presents a newly developed Incoherent Broadband Cavity Enhanced Absorption Spectroscopy (IBBCEAS) system for precise and rapid measurements of HONO and nitrogen dioxide (NO) emissions.
View Article and Find Full Text PDFNanomaterials (Basel)
December 2024
Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.
Besides the intensity and wavelength, the ability to analyze the optical polarization of detected light can provide a new degree of freedom for numerous applications, such as object recognition, biomedical applications, environmental monitoring, and remote sensing imaging. However, conventional filter-integrated polarimetric sensing systems require complex optical components and a complicated fabrication process, severely limiting their on-chip miniaturization and functionalities. Herein, the reconfigurable polarimetric photodetection with photovoltaic mode is developed based on a few-layer MoS/PdSe heterostructure channel and a charge-trap structure composed of AlO/HfO/AlO (AHA)-stacked dielectrics.
View Article and Find Full Text PDFPLoS One
December 2024
Xilinhot Earthquake Monitoring Center Station, Xilinhot, Inner Mongolia Autonomous Region, China.
Analysis of the continuous ambient noise data collected by a dense network of broadband seismic stations reveals the characteristics of ambient noise in densely populated urban areas. A study conducted in central Inner Mongolia utilized ten broadband stations to investigate two distinct repetitive and intense noise signals with predominant frequencies ranging from 1-20 Hz and 0.01-1 Hz.
View Article and Find Full Text PDFNanophotonics
July 2024
School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China.
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