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Related Concept Videos

Properties of Enantiomers and Optical Activity02:24

Properties of Enantiomers and Optical Activity

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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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Consider a cylindrical shaft with a length denoted by L and a consistent cross-sectional radius referred to as r. This shaft undergoes a torque at the free end. The highest shearing strain within the shaft is directly proportional to the twist angle and the radial distance from the shaft axis. When the shaft behaves elastically, this shearing strain can be articulated using variables such as the applied torque, radial distance, the polar moment of inertia, and the modulus of rigidity. By...
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Angle of Twist: Problem Solving01:13

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An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the...
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Related Experiment Video

Updated: Jul 20, 2025

Hyperspectral Imaging as a Tool to Study Optical Anisotropy in Lanthanide-Based Molecular Single Crystals
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Tunable Optical Activity in Twisted Anisotropic Two-Dimensional Materials.

Su-Yun Wang1, De-Kang Li1, Ming-Jie Zha1

  • 1The Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, School of Physics and Teda Applied Physics Institute, Nankai University, Tianjin 300071, China.

ACS Nano
|August 2, 2023
PubMed
Summary

Researchers engineered tunable chirality in twisted 2D anisotropic materials like black phosphorus (BP) and ReS2. This breakthrough offers significant potential for advanced nanodevices and chiroptical applications.

Keywords:
2D materialminiaturizationtunable circular dichroismtwisted ReS2twisted black phosphorus

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Twisted van der Waals structures offer unique electrical and optical properties for nanodevices.
  • Programming atomic-scale chirality in films is challenging due to fabrication and measurement limitations.

Purpose of the Study:

  • To demonstrate highly tunable large optical activity in twisted anisotropic 2D materials.
  • To explore tailoring chirality through material symmetry, band structure, and anisotropy.

Main Methods:

  • Fabrication of twisted van der Waals heterostructures using black phosphorus (BP), ReS2, PdSe2, and α-MoO3.
  • Systematic variation of twist angles between stacked 2D material layers.
  • Characterization of chiroptical response across visible to infrared spectra.

Main Results:

  • Achieved highly tunable chirality by controlling twist angles in 2D anisotropic materials.
  • Reported record thickness-normalized ellipticity (13.8 deg μm⁻¹, twisted ReS2) and ellipticity (1581 mdeg, twisted BP).
  • Demonstrated spin-selective control of information transformation using twisted ReS2.

Conclusions:

  • Engineered chirality in twisted 2D anisotropic materials is highly controllable.
  • These materials exhibit broad chiroptical responses from visible to infrared wavelengths.
  • Potential applications include on-chip polarization optics, nano-optoelectronics, and biological sensing.