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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
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Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
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The brain processes sensory information rapidly due to parallel processing, which involves sending data across multiple neural pathways at the same time. This method allows the brain to manage various sensory qualities, such as shapes, colors, movements, and locations, all concurrently. For instance, when observing a forest landscape, the brain simultaneously processes the movement of leaves, the shapes of trees, the depth between them, and the various shades of green. This enables a quick and...
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It is essential to understand the difference between chiral and achiral interactions and the implications thereof in optical activity and their applications. Just as our feet, which are chiral, interact uniquely with chiral objects, such as a pair of shoes, but identically with achiral socks, enantiomers of a molecule exhibit different properties only when they interact with other chiral media. An example of a significant implication from this facet is the phenomenon known as optical activity,...
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Circularly polarized-light-driven chiral optoelectronics: encoding, sensing, and neuromorphic processing from an

Mingde Qi1, Houchao Jing2, Pengfei Duan2

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Chiral materials enable circularly polarized light (CPL) applications in encryption, photodetection, and neuromorphic computing. Advances focus on manipulating CPL

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Area of Science:

  • Optoelectronics
  • Chirality
  • Photonics

Background:

  • Circularly polarized light (CPL) carries spin angular momentum, manipulable by chiral materials.
  • Chiral materials translate molecular asymmetry into optical and electrical signals for polarization-sensitive applications.

Purpose of the Study:

  • Review recent advances in CPL-driven optoelectronics from an information-flow perspective.
  • Focus on optical encryption, photodetection, and neuromorphic processing.
  • Highlight mechanisms, applications, and future challenges.

Main Methods:

  • Elucidate CPL-matter interactions and chiroptical phenomena.
  • Review CPL-based encryption, anticounterfeiting, and photodetection schemes.
  • Discuss CPL-driven optoelectronic synapses and polarization-tunable synaptic plasticity.

Main Results:

  • Multidimensional encoding for enhanced security in encryption.
  • Chiral semiconductors and device architectures for polarization-discriminating imaging and secure communications.
  • Emerging CPL-driven optoelectronic synapses integrating perception, memory, and computation.

Conclusions:

  • CPL-driven optoelectronics offer novel pathways for information encoding, readout, and computation.
  • Critical challenges remain in scalability, multimodality, and adaptability.
  • Future research should focus on developing advanced chiral optoelectronic systems.