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相关概念视频

UV–Vis Spectrometers01:14

UV–Vis Spectrometers

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. Samples for...
Gas Chromatography: Types of Detectors-II01:19

Gas Chromatography: Types of Detectors-II

In gas chromatography, different detectors are employed to meet specific analytical needs. These detectors are often categorized based on their detection mechanisms and the types of compounds they are best suited to analyze. Thermal Conductivity Detectors (TCD), Flame Ionization Detectors (FID), and Electron Capture Detectors (ECD) represent common categories, each with unique operating principles and applications. However, beyond these, several other detectors are designed for more specialized...
Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
Atomic Emission Spectroscopy: Instrumentation01:22

Atomic Emission Spectroscopy: Instrumentation

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.
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation

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.
Atomic Emission Spectroscopy: Lab01:29

Atomic Emission Spectroscopy: Lab

AES is a powerful analytical technique, especially effective when used with plasma sources, producing abundant spectra in characteristic emission lines. The Inductively Coupled Plasma (ICP), in particular, yields superior quantitative analytical data due to its high stability, low noise, low background, and minimal interferences under optimal experimental conditions. However, newer air-operated microwave sources are emerging as promising alternatives that could be more cost-effective than...

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相关实验视频

Updated: Jun 12, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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介电金属阵列用于可见光谱中的同时极化和波面映射.

Ling Li1, Meiyan Pan2, Jian Zhang1

  • 1State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, College of Mechanical and Vehicle Engineering, Hunan University, Changsha 410082, People's Republic of China.

Nano letters
|June 25, 2025
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概括

这项研究介绍了一种紧的TiO2金属阵列,用于先进的极化分析. 共享孔径设计同时聚焦多个极化状态,从而实现高效的斯托克斯参数重建和矢量束特征.

关键词:
金属是金属的,金属是金属的地表表层的表层.极化检测检测 极化检测检测一次性的一次性射击.波浪前线映射的绘制

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科学领域:

  • 光学和光子学 在光学和光子学.
  • 超材料是指一种超材料.
  • 纳米技术纳米技术

背景情况:

  • 传统的极度测量系统很庞大,限制了应用.
  • 金属数组为偏振分析提供了紧的替代方案.
  • 在子金属结构中提高效率和分辨率是具有挑战性的.

研究的目的:

  • 开发一个共享孔径的metalens阵列,用于同时进行多极化聚焦.
  • 为了实现全面的斯托克斯参数重建和相梯度量化.
  • 在一个紧的系统中展示复杂向量束的准确表征.

主要方法:

  • 制造一个共享孔径的二氧化 (TiO2) 金属阵列.
  • 单聚焦场分析用于极化状态的确定.
  • 矢量束的特征,包括极化和分离波面.

主要成果:

  • 六个极化元件的同时聚焦成一个六角格子.
  • 在斯托克斯参数重建中的高精度 (4.64%的偏差).
  • 精确的相梯度量化 (高达1.75rad/μm) 与最小化的交叉交谈.

结论:

  • 开发的metalens阵列为极化分析提供了一个紧而高效的平台.
  • 集成系统可以同时进行极化状态分析和自适应波面控制.
  • 这项技术对量子光学和空间有限的应用具有前景.