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相关概念视频

Stereoisomers02:32

Stereoisomers

On the basis of mirror symmetry, stereoisomers of an organic molecule can be further classified into diastereomers and enantiomers. Diastereomers are stereoisomers that are not mirror images of each other. Substituted alkenes, such as the cis and trans isomers of 2-butene, are diastereomers, as these molecules exhibit different spatial orientations of their constituent atoms, are not mirror images of each other, and do not interconvert. Here, the interconversion is suppressed due to restricted...
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)01:20

¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)

When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
Stereochemical Effects of Enolization01:12

Stereochemical Effects of Enolization

The chiral α-carbon of the carbonyl compound is the stereocenter of the molecule. As shown in the figure below, when such a carbonyl compound undergoes racemization under an acidic or basic condition, an achiral enol is formed.
Masking and Demasking Agents01:19

Masking and Demasking Agents

EDTA titrations may necessitate masking and demasking agents to temporarily protect a particular metal ion in a mixture from the EDTA reaction. These agents facilitate the sequential analysis of the metal ions by forming stable complexes with some—but not all—metal ions during certain steps.
There are many masking agents, such as cyanide, fluoride, triethanolamine, thiourea, and 2,3-bis(sulfanyl)propan-1-ol (formerly 2,3-dimercapto-1-propanol), with the masking agent chosen based on the metal...

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相关实验视频

Updated: Jun 17, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
09:33

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

Published on: June 7, 2019

6.2K

基于metasurface的光学加密和隐形图谱,增强了信息安全.

Wen Xing1, Changke Bu1, Xiaoyi Zhang1

  • 1School of Information Science and Engineering, Shandong Key Laboratory of Ubiquitous Intelligent Computing, University of Jinan, Jinan, 250022, China.

Nanophotonics (Berlin, Germany)
|May 1, 2025
PubMed
概括
此摘要是机器生成的。

本研究介绍了一种使用元表面的双层光学加密系统. 该方法将秘密数据嵌入到图像中,并将其编码到元表面上,以提高信息安全性.

关键词:
metasurface 地表的表面是什么通过光学加密进行加密.极化复杂化 多重复杂化石摄影 (steganography) 是一种石摄影技术.波长复杂化的波长复杂化.

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Rendering SiO2/Si Surfaces Omniphobic by Carving Gas-Entrapping Microtextures Comprising Reentrant and Doubly Reentrant Cavities or Pillars
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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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相关实验视频

Last Updated: Jun 17, 2026

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科学领域:

  • 光学和光子学 在光学和光子学.
  • 信息安全 信息安全
  • 材料科学 材料科学 材料科学

背景情况:

  • 超表面为光学加密提供先进的光操纵功能.
  • 目前的超表面加密缺乏强大的安全措施,需要进一步研究.

研究的目的:

  • 提出并演示使用元表面的双层光学加密和隐形图表方案.
  • 通过硬件级别的保护来加强信息安全,防止未经授权的访问.

主要方法:

  • 秘密数据嵌入使用运行长度编码 (RLE) 进行初始数据分散.
  • 将载波图像编码到元表面上,利用波长和极化作为光学键.
  • 在可见光谱中的超表面样本的制造和表征.

主要成果:

  • 通过使用光学钥匙,成功检索了三张加密的载体图像,其高保真度和最小的交叉声音.
  • 通过相应的解密算法精确提取隐藏的秘密信息.
  • 通过数据嵌入和地表编码来展示双层安全性.

结论:

  • 拟议的Metasurface-enabled方案为光学加密和隐藏图提供了一个强大的双层方法.
  • 这种方法显著提高了光学信息的安全性,减少了对数据泄露的敏感性.
  • 这项技术在安全通信和防伪领域的应用方面表现有前途.