Related Experiment Video
Updated: May 9, 2025
08:04
Excitonic Hamiltonians for Calculating Optical Absorption Spectra and Optoelectronic Properties of Molecular Aggregates and Solids
Published on: May 27, 2020
8.3K
Higher-order anapole-exciton strong coupling in nested Si-based hybrid systems
Optics Letters
|May 1, 2025
Summary
This study explores strong coupling of higher-order anapoles with excitons in novel silicon-based hybrid nanostructures. Researchers achieved significant Rabi splittings, paving the way for advanced nanophotonics and nanolasers.
Area of Science:
- Photonics and Nanophotonics
- Condensed Matter Physics
- Materials Science
Background:
- Higher-order anapoles offer unique properties for nonlinear optics and nanolasers.
- Strong coupling involving higher-order anapoles remains an underexplored area.
Purpose of the Study:
- To theoretically investigate strong coupling between higher-order anapoles and excitons in silicon-based hybrid nanostructures.
- To explore the potential of nested nanodisk-ring structures for enhanced light-matter interactions.
Main Methods:
- Theoretical modeling of hybrid systems composed of silicon (Si) and tungsten diselenide (WSe2).
- Tuning structural parameters of Si nanoring/WSe2 nanodisk and Si nanodisk/WSe2 nanoring configurations.
- Analysis of anapole excitation and exciton coupling using Rabi splitting as a metric.
Main Results:
- Achieved strong coupling of first-, second-, and third-order anapoles with WSe2 nanodisk excitons, yielding Rabi splittings up to 90.95 meV.
- Demonstrated strong coupling of first- and second-order anapoles with WSe2 nanoring excitons in a different configuration, with Rabi splittings reaching 191.3 meV.
- Successfully tuned structural parameters to control and enhance anapole-exciton coupling.
Conclusions:
- The proposed Si-based hybrid systems enable strong coupling of higher-order anapoles with excitons.
- This research opens new avenues for studying higher-order anapoles and developing high-performance strong coupling devices.
- The findings hold promise for advancements in nonlinear optics, nanolasers, and other nanophotonic applications.
Related Concept Videos
01:27¹H NMR: Long-Range Coupling
1.5K
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...
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...
1.5K
01:09¹H NMR: Pople Notation
1.6K
The Pople nomenclature system classifies spin systems based on the difference between their chemical shifts. Coupled spins are denoted by capital letters with subscripts indicating the number of equivalent nuclei. When the coupled nuclei have well-separated chemical shifts, they are assigned letters that are far apart in the alphabet, such as A and X. When the difference in chemical shifts is small, coupled nuclei are named using adjacent letters of the alphabet (AB, MN, or XY).
A proton...
A proton...
1.6K
03:35Hybridization of Atomic Orbitals II
31.0K
sp3d and sp3d 2 Hybridization
31.0K
01:22Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)
999
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the...
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the...
999
01:02¹H NMR: Interpreting Distorted and Overlapping Signals
922
Spin systems where the difference in chemical shifts of the coupled nuclei is greater than ten times J are called first-order spin systems. These nuclei are weakly coupled, and their chemical shifts and coupling constant can generally be estimated from the well-separated signals in the spectrum.
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...
922
01:20Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)
905
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...
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...
905