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相关概念视频

Photoelectric Effect02:26

Photoelectric Effect

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When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...
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Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
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The role of the detectors in High-Performance Liquid Chromatography (HPLC) is to analyze the solutes as they exit from the chromatographic column. The detector recognizes the solute's property and generates corresponding electrical signals, which are converted into a readable graph of the detector's response versus elution time called a chromatogram at the computer. There are several types of HPLC detectors, each with its own advantages and limitations, depending on the analyte...
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German physicist Wilhelm Röntgen (1845–1923) was experimenting with electrical current when he discovered that a mysterious and invisible "ray" would pass through his flesh but leave an outline of his bones on a screen coated with a metal compound. In 1895, Röntgen made the first durable record of the internal parts of a living human: an "X-ray" image (as it came to be called) of his wife’s hand. Scientists worldwide quickly began their own experiments with...
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Atomic fluorescence spectroscopy (AFS) is an analytical technique that involves the electronic transitions of atoms in a flame, furnace, or plasma being excited by electromagnetic (EM) radiation. When these atoms absorb energy, they become excited and subsequently release energy as they return to their original state. This emitted light, or "fluorescence," is observed at a right angle to the incident beam. Both absorption and emission processes transpire at distinct wavelengths, which...
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Synthesis and Operation of Fluorescent-core Microcavities for Refractometric Sensing
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封闭增强的核心外雪崩光探测器

Zongwen Li1, Yunfei Xie1, Zishun Li2

  • 1College of Integrated Circuits, State Key Laboratory of Silicon and Advanced Semiconductor Materials, ZJU-Hangzhou Global Scientific and Technological Innovation Center, Zhejiang University, Hangzhou 310027, China.

ACS nano
|July 8, 2025
PubMed
概括
此摘要是机器生成的。

我们开发了一种新型的纳米线光探测器,使用石墨烯来增强近红外 (NIR) 光探测. 该设备克服了传统雪崩光探测器 (Si-APD) 的局限性,提高了电信应用的性能.

关键词:
在SiO2-被动化Si纳米线上.监禁增强的雪崩光探测器核心-外结构 核心-外结构石墨烯是一种石墨烯.异质连接异质连接接近红外线的近红外线

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Dynamic Pore-scale Reservoir-condition Imaging of Reaction in Carbonates Using Synchrotron Fast Tomography
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Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2
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相关实验视频

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科学领域:

  • 光电学是指光电子产品.
  • 材料科学 材料科学 材料科学
  • 纳米技术 纳米技术

背景情况:

  • 基于的雪崩光探测器 (Si-APD) 对于CMOS兼容的光电子设备至关重要,但由于近红外 (NIR) 吸收和性能限制较弱而困难.
  • 传统的Si-APD面临着诸如非均的雪崩触发,高倍数噪声和表面重组等挑战,阻碍了它们在新兴的NIR检测中使用.

研究的目的:

  • 设计一种新型光电探测器,克服传统Si-APD的局限性,以提高NIR检测.
  • 为了利用光子封闭和局部场增强,以改善在1550 nm的雪崩光检测.

主要方法:

  • 使用垂直SiNW作为核心外纳米共振器制造SiO2被动化Si纳米线 (SiO2-SiNW) /石墨烯封闭增强光探测器.
  • 在纳米结构中使用光子封闭来增强光吸收和在SiNW/石墨烯范德瓦尔斯 (vdW) 接口的局部场增强,用于雪崩光检测.

主要成果:

  • 该设备表现出高响应率56.58A/W和雪崩增强率为2.64 × 10^4.4的高响应率.
  • 性能归因于纳米共振器增强的光物质相互作用的协同效应,以及在封闭的雪崩状态下高效的载体繁殖.

结论:

  • 开发的SiO2-SiNW/石墨烯光探测器为NIR检测挑战提供了一个有前途的解决方案.
  • 这种介电工程纳米结构和VDW异构结构的集成平台,可以精确控制先进光电子系统的光子管理和载体传输.