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Stereoisomerism

Stereoisomerism

Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...

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相关实验视频

Updated: Jan 15, 2026

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

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

Published on: September 25, 2020

触摸驱动的双螺旋超结构用于对多重复合光学信息进行嵌套加密.

Rui Sun¹, Si-Jia Liu¹, Yi-Heng Zhang^1,2

¹National Laboratory of Solid State Microstructures, Key Laboratory of Intelligent Optical Sensing and Manipulation, College of Engineering and Applied Sciences, and Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing, 210093, China.

Advanced materials (Deerfield Beach, Fla.)

|October 15, 2025

概括

一种新的动态光学加密方法使用触摸灵敏的液晶来跨多维编码数据. 这种先进的技术通过要求特定的交互命令来提高数据检索的安全性.

关键词:

性纳米结构是一种性纳米结构.一个全息图,一个全息图.液晶是一种液体晶体.通过光学加密进行加密.这是一种光学多重复合 (optical multiplexing).

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Patterning via Optical Saturable Transitions - Fabrication and Characterization

Patterning via Optical Saturable Transitions - Fabrication and Characterization

Published on: December 11, 2014

相关实验视频

Last Updated: Jan 15, 2026

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

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

Published on: September 25, 2020

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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Published on: March 20, 2017

Patterning via Optical Saturable Transitions - Fabrication and Characterization

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Published on: December 11, 2014

科学领域:

材料科学材料科学材料科学
光学是什么?光学是什么?光学是什么?
信息安全信息安全

背景情况:

光学加密提供高速,低功耗的数据安全性.
现有的方法经常使用静态结构和有限的光学自由度 (DOF),使它们变得脆弱.
需要更强大,更动态的光学加密技术.

研究的目的:

提出一个动态嵌套的光学加密方案,使用触摸驱动的双合胆固醇液晶 (CLC) 超结构.
通过在多个光学DOF和环境因素中编码信息来增强数据安全.
为高安全性和高容量光学信息学开发一种新型范式.

主要方法:

组合了浮雕结构的聚合式CLC和对温度敏感的对手CLC的上层结构的制造.
利用光图和布拉格反射工程来诱导独立的几何相.
实施一个四步加密算法,将纯文本和多层加密文本复合起来.

主要成果:

独立的几何相被诱导到反射光与直角圆极化和多个波长.
光学DOF (波长,振幅,极化) 和环境因素 (温度,触摸相互作用) 被编码为加密维度.
展示了四级嵌套加密,纯文本检索需要一个特定的命令和最后一个人类触摸.

结论:

开发的方案为高安全性和高容量的光学信息学提供了一个新的范式.
这项工作推进了针对先进应用的按需构建合纳米结构的研究.
动态,多维加密方法显著提高了数据安全性,防止攻击.