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Related Concept Videos

Chirality02:25

Chirality

22.6K
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.
Chiral objects exhibit a sense of handedness when they interact with another chiral object. For example, our left foot can only fit in the left shoe and not in the right shoe. Achiral objects — objects that have...
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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
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¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

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The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
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Chirality in Nature02:30

Chirality in Nature

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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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Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
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NMR Spectroscopy: Spin–Spin Coupling01:08

NMR Spectroscopy: Spin–Spin Coupling

1.1K
The spin state of an NMR-active nucleus can have a slight effect on its immediate electronic environment. This effect propagates through the intervening bonds and affects the electronic environments of NMR-active nuclei up to three bonds away; occasionally, even farther. This phenomenon is called spin–spin coupling or J-coupling. Coupling interactions are mutual and result in small changes in the absorption frequencies of both nuclei involved. While nuclei of the same element are involved...
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Fabrication And Characterization Of Photonic Crystal Slow Light Waveguides And Cavities
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Chiral lasing enabled by strong coupling.

Huachun Deng1, Xiong Jiang1, Yao Zhang1

  • 1Ministry of Industry and Information Technology Key Lab of Micro-Nano Optoelectronic Information System, Guangdong Provincial Key Laboratory of Semiconductor Optoelectronic Materials and Intelligent Photonic Systems, Harbin Institute of Technology, Shenzhen 518055, P. R. China.

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|April 9, 2025
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Summary
This summary is machine-generated.

Researchers engineered chiral metasurfaces to achieve high-purity chiral laser emission by coupling two resonances. This breakthrough enables directional chiral lasing, overcoming limitations of conventional quasi-bound states in the continuum (quasi-BIC) lasers.

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Area of Science:

  • Photonics
  • Metamaterials
  • Quantum Optics

Background:

  • Chiral quasi-bound states in the continuum (quasi-BICs) are high-Q resonances in photonic structures.
  • These states support chiral lasing but are typically limited to vertical emission.
  • Engineering in-plane and out-of-plane asymmetries breaks symmetry-protected optical states.

Purpose of the Study:

  • To explore the coupling between two resonances in a chiral metasurface.
  • To introduce a novel mechanism for high-purity chiral laser emission.
  • To enable directional chiral lasing beyond conventional vertical emission.

Main Methods:

  • Engineered a chiral metasurface to induce strong coupling between two resonances with orthogonal polarizations.
  • Utilized the inherent phase difference of resonances for coherent destruction of the decay channel.
  • Experimentally verified the mechanism through transmission spectra, angle-resolved photoluminescence, and laser emission measurements.

Main Results:

  • Achieved strong coupling between two nearly orthogonal polarized resonances in the engineered chiral metasurface.
  • Demonstrated that the phase difference maximizes chirality in one of the hybrid modes, leading to high-Q factor.
  • Successfully realized high-purity chiral laser emission.

Conclusions:

  • The proposed mechanism allows for breaking restrictions on conventional chiral quasi-BIC lasing.
  • This approach enables the realization of chiral emission at any designed direction.
  • The findings pave the way for versatile chiral photonic devices.