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Related Concept Videos

Stereoisomerism02:52

Stereoisomerism

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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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Related Experiment Video

Updated: Jan 15, 2026

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
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Touch-Driven Bi-Chiral Superstructures for Nested Encryption of Multiplexed Optical Information.

Rui Sun1, Si-Jia Liu1, Yi-Heng Zhang1,2

  • 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
PubMed
Summary
This summary is machine-generated.

A novel dynamic optical encryption method uses touch-sensitive liquid crystals to encode data across multiple dimensions. This advanced technique enhances security by requiring specific interaction orders for data retrieval.

Keywords:
chiral nanostructuresholographyliquid crystalsoptical encryptionoptical multiplexing

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Area of Science:

  • Materials Science
  • Optics
  • Information Security

Background:

  • Optical encryption offers high-speed, low-power data security.
  • Existing methods often use static structures and limited optical degrees of freedom (DOFs), making them vulnerable.
  • There is a need for more robust and dynamic optical encryption techniques.

Purpose of the Study:

  • To propose a dynamic nested optical encryption scheme using a touch-driven bi-chiral cholesteric liquid crystal (CLC) superstructure.
  • To enhance data security by encoding information in multiple optical DOFs and environmental factors.
  • To develop a novel paradigm for high-security and high-capacity optical informatics.

Main Methods:

  • Fabrication of a superstructure combining relief-structured polymerized CLCs and temperature-sensitive opposite-handed CLCs.
  • Utilizing photopatterning and Bragg reflection engineering to induce independent geometric phases.
  • Implementing a four-step encryption algorithm that multiplexes plaintext and multilevel ciphertexts.

Main Results:

  • Independent geometric phases were induced to reflected light with orthogonal circular polarization and multiple wavelengths.
  • Optical DOFs (wavelength, amplitude, polarization) and environmental factors (temperature, touch interaction) were encoded as encryption dimensions.
  • A four-level nested encryption was demonstrated, with plaintext retrieval requiring a specific order and a final human touch.

Conclusions:

  • The developed scheme offers a new paradigm for high-security and high-capacity optical informatics.
  • This work advances the on-demand construction of chiral nanostructures for advanced applications.
  • The dynamic, multi-dimensional encryption approach significantly enhances data security against attacks.