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相关概念视频

Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

279
The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
279
UV–Vis Spectrometers01:14

UV–Vis Spectrometers

1.2K
The absorbance of UV and visible (UV–visible) radiations is measured using a UV–visible spectrophotometer. Deuterium lamps, which emit UV radiation, and tungsten lamps, which produce radiation in the visible region, are used as light sources in UV–visible spectrophotometers. A monochromator or prism is used for diffraction grating, i.e., to split the incoming radiation into different wavelengths. A system of slits is used to focus the desired wavelength on the sample cell.
1.2K
IR Spectrometers01:25

IR Spectrometers

1.0K
There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
1.0K
Spectrophotometry: Introduction01:16

Spectrophotometry: Introduction

2.8K
Spectrophotometry is the quantitative measurement of the absorption, reflection, diffraction, or transmission of electromagnetic radiation through a material as a function of the intensity and wavelength of the radiation. A spectrophotometer is a device used to measure the change in the radiation intensity caused by its interaction with the material.
The essential components of a spectrophotometer include a source of electromagnetic radiation, a slot for placing a material to be analyzed, and a...
2.8K

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相关实验视频

Updated: May 16, 2025

Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
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迷你化无序光子分子光谱仪

Yujia Zhang1, Tom Albrow-Owen2, Zhenyu Zhao1

  • 1State Key Laboratory of Photonics and Communications, School of Information and Electronic Engineering, Shanghai Jiao Tong University, Shanghai, 200240, China.

Light, science & applications
|March 31, 2025
PubMed
概括

研究人员开发了一种超微型的无序光子分子光谱仪. 这种新型设备克服了当前计算光谱仪的尺寸和分辨率限制,实现了高性能便携式光谱学.

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科学领域:

  • 光子学 是一个光子学.
  • 频谱学是一种光谱学.
  • 集成光学 集成光学 集成光学

背景情况:

  • 计算光谱仪为现场测量提供小型化,芯片上的解决方案.
  • 目前的系统在编码器性能方面面临局限性,冗余的响应矩阵阻碍了微型化.
  • 尺寸,分辨率和带宽之间的权衡限制了光谱编码器,需要长光学路径来实现高分辨率.

研究的目的:

  • 报告一个突破性的超小型化无序光子分子光谱仪.
  • 克服现有光谱仪的分辨率,带宽和足迹限制.
  • 为了展示一种新的高性能,可制造的微型光谱学的方法.

主要方法:

  • 利用复杂的电磁合来生成准随机的光谱响应矩阵.
  • 采用光子频率,振幅和相位的动态操纵.
  • 在一个CMOS兼容的集成光子平台上构建了光谱仪.

主要成果:

  • 实现了高Q因子 (>7.74 × 10^5) 的有效无限的自由光谱范围 (FSR).
  • 证明了超过100纳米的广泛操作带宽.
  • 在一个超紧的足迹 (70 × 50 μm2) 中,达到8 pm的超高光谱分辨率.

结论:

  • 无序的光子分子光谱仪超过了当前的分辨率-带宽-足迹指标.
  • 新的准随机响应矩阵克服了小型化光谱仪的基本限制.
  • 这项技术为高性能,可制造的微型光谱学提供了一种开创性的方法.