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相关概念视频

Mass Analyzers: Overview01:13

Mass Analyzers: Overview

689
The mass analyzer is a crucial component of the mass spectrometer. In the ionization chamber, the vaporized sample is bombarded with a high-energy electron beam to generate a radical cation and further fragment into neutral molecules, radicals, and cations. A series of negatively charged accelerator plates accelerate the cations into the mass analyzer. The mass analyzer separates ions according to their mass-to-charge (m/z) ratios and then directs them to the detector. The common types of mass...
689
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

233
Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
There are three main types of inductively coupled plasma atomic emission spectroscopy  (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used....
233
MALDI-TOF Mass Spectrometry01:19

MALDI-TOF Mass Spectrometry

4.8K
Mass spectrometry is a powerful characterization technique that can identify and separate a wide variety of compounds ranging from chemical to biological entities, based on their mass-to-charge ratio (m/z). The instruments that allow this detection, known as mass spectrometers, have three components: an ion source, a mass analyzer, and a detector. These spectrometers differ based on the nature of their ion source and analyzers.
Matrix-assisted laser desorption ionization (MALDI) is a commonly...
4.8K
IR Spectrometers01:25

IR Spectrometers

1.2K
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...
1.2K
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

389
Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
The ATR process begins by directing a beam...
389
Spectrophotometry: Introduction01:16

Spectrophotometry: Introduction

3.2K
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...
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相关实验视频

Updated: Jul 11, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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紧的角度分辨率的超表面光谱仪.

Guiyi Cai1, Yanhao Li1, Yao Zhang1

  • 1Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems, Harbin Institute of Technology, Shenzhen, People's Republic of China.

Nature materials
|November 3, 2023
PubMed
概括
此摘要是机器生成的。

我们开发了一个紧的角度分辨率光谱成像系统,使用元表面和金属镜头. 这种微型光谱仪实现了高精度和分辨率,使实验室以外的先进光学分析成为可能.

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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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High Speed Sub-GHz Spectrometer for Brillouin Scattering Analysis
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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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科学领域:

  • 光学和光子学 在光学和光子学.
  • 材料科学 材料科学 材料科学
  • 频谱学是一种光谱学.

背景情况:

  • 光携带着特定材料的信息,可以通过角度解析的光谱分析来检测.
  • 传统的角度分辨率光谱需要大型的实验室光学设置,这限制了其实际应用.
  • 微型化对于更广泛地采用先进的光谱分析技术至关重要.

研究的目的:

  • 为了展示一个紧的角度分辨率光谱成像系统.
  • 为了克服大型传统光谱设备的局限性.
  • 为了在小型化的形式因素中实现高性能光谱分析.

主要方法:

  • 集成一个可调节的超地基光谱仪阵列与一个金属.
  • 开发了一种小型化的光谱仪,其足迹为4x4μm2.2.
  • 通过将光谱仪模拟成一个阵列并将其放置在金属的后侧焦平面上来实现光谱成像.

主要成果:

  • 波长准确度为0.17nm,光谱分辨率为0.4nm.
  • 实现了149dB的线性动态范围和1.2fJ的检测极限.
  • 通过组合系统获得了4.88 × 10−3 rad的角分辨率.

结论:

  • 开发的紧的角度分辨率光谱成像系统在小型化的足迹中提供了高性能.
  • 这项技术克服了传统的角度分辨率光谱学的尺寸限制.
  • 该系统有可能增强先进的光学成像和光谱分析应用.