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相关概念视频

IR Spectrum01:19

IR Spectrum

892
When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
Transmittance is defined as the ratio of the radiant power passing through a sample to that from the radiation's source. Multiplying the transmittance by 100 gives the percent transmittance (%T), which varies between 100% (no absorption) and 0%...
892
Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview

264
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...
264
IR Spectrometers01:25

IR Spectrometers

1.1K
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...
1.1K
Infrared (IR) Spectroscopy: Overview01:09

Infrared (IR) Spectroscopy: Overview

1.4K
When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
1.4K
UV–Vis Spectroscopy: Molecular Electronic Transitions01:16

UV–Vis Spectroscopy: Molecular Electronic Transitions

1.3K
In Ultraviolet–Visible (UV–Vis) spectroscopy, the absorption of electromagnetic radiation is used to probe the electronic structure of molecules. This technique provides insights into molecular electronic transitions, particularly the movement of electrons between different molecular orbitals. Radiation is absorbed if the energy of the electromagnetic radiation passing through the molecule is precisely equal to the energy difference between the excited and ground states. During this...
1.3K
IR Frequency Region: Fingerprint Region01:03

IR Frequency Region: Fingerprint Region

702
IR spectra are divided into two main regions: the diagnostic region and the fingerprint region. The diagnostic region of the spectrum lies above 1500 cm−1. The absorptions resulting from single-bond vibrations of the N–H, C–H, and O–H stretch at higher wavenumbers and appear on the left side of the spectrum. The stretching absorptions of the C≡C and C≡N occur between 2100–2300 cm−1. In contrast, those arising from stretching absorptions of the...
702

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相关实验视频

Updated: May 24, 2025

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

Published on: September 25, 2020

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一个Tribandmetasurface覆盖可见,中波红外和长波红外光学安全的光学安全.

Qixiang Chen1, Xuemei Huang2, Zezhao Ju3

  • 1School of Energy and Environment, Southeast University, Nanjing, Jiangsu 210096, China.

Nano letters
|March 4, 2025
PubMed
概括

研究人员开发了一种新的三带元表面,用于先进的光学安全. 这项技术使可见,中波红外和长波红外频段的同步加密成为可能,增强了防伪措施.

关键词:
打击假冒和伪造的行为大气窗口的大气窗口红外伪装 红外伪装 红外伪装光学安全的安全.光子结构的光子结构.选择性热排放的选择性热排放

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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

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相关实验视频

Last Updated: May 24, 2025

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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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
  • 信息安全 信息安全

背景情况:

  • 光学安全方法正在进步,可见 (VIS) 和红外 (IR) 频段的双频段加密已建立.
  • 在VIS,中波红外 (MWIR) 和长波红外 (LWIR) 频段中同步的光学安全性是一个重大挑战.

研究的目的:

  • 在VIS,MWIR和LWIR频段中实验演示三带超表面,用于跨VIS,MWIR和LWIR频段的同步光学安全.
  • 探索用于增强光学安全和防伪应用的新方法.

主要方法:

  • 三带元表面的制造和特征.
  • 在VIS成像中使用结构色彩.
  • 在MWIR和LWIR成像中使用选择性发射率结构.
  • 信息编码和加密能力的验证.

主要成果:

  • 成功演示了覆盖VIS,MWIR和LWIR频段的三带超表面.
  • 通过结构色彩实现的VIS成像.
  • 通过选择性发射率实现的MWIR/LWIR成像 (MWIR/LWIR:分别为0.81/0.17和0.21/0.83).
  • 在VIS频段内完全隐藏MWIR和LWIR信息.
  • 复杂信息编码和误导信息的加密的验证.

结论:

  • 三带超表面为跨多个光谱频段的同步光学安全提供了一个新的范式.
  • 这项技术在防伪和热伪装应用中具有显著的潜力.
  • 介绍了先进光学加密和信息安全的新方法.