Related Experiment Video
Updated: Jan 23, 2026
12:18
Microwave Photonics Systems Based on Whispering-gallery-mode Resonators
Published on: August 5, 2013
17.5K
Spin photonics in 3D whispering gallery mode resonators.
Optics Express
|June 6, 2019
Summary
This study explores spin-orbit interactions in whispering gallery modes (WGMs) and quantum emitters. We reveal spin-momentum locking in WGMs, enabling unidirectional excitation of specific orbital angular momentum modes.
Area of Science:
- Quantum Optics
- Condensed Matter Physics
- Nanophotonics
Background:
- Whispering gallery modes (WGMs) possess orbital angular momentum.
- The interplay between spin density, orbital angular momentum, and near-field interactions with quantum emitters is not well understood.
Purpose of the Study:
- Investigate the spin-orbit interaction between a circularly polarized dipole and WGMs in a spherical resonator.
- Explore the role of local spin density in near-field light-matter interactions.
Main Methods:
- Utilized an exact dyadic Green's function approach.
- Analyzed the near-field interaction between photonic spin and the local electromagnetic spin density of WGMs.
Main Results:
- Demonstrated that near-field interactions induce unidirectional excitation of WGMs with specific orbital angular momentum.
- Identified this phenomenon as spin-momentum locking in spherical resonators.
- Established local spin density, momentum, and decay as a universal right-handed electromagnetic triplet for near-field interactions.
Conclusions:
- The findings reveal a new mechanism for controlling light-matter interactions via spin-orbit coupling in WGMs.
- Discussed experimental requirements for cold atoms and quantum dots, highlighting potential applications.
- Emphasized the significance of the electromagnetic triplet for future photonic and quantum technologies.
Related Concept Videos
01:07What is a Mode?
25.1K
The mode is one of the commonly used measures of a central tendency. It is defined as the most frequent value in a data set.
There can be more than one mode in a data set if multiple values have the same highest frequency. For instance, suppose that the Statistics exam scores of 20 students are: 50; 53; 59; 59; 63; 63; 72; 72; 72; 72; 72; 76; 78; 81; 83; 84; 84; 84; 90; 93. Here, the mode is 72, as it occurs most frequently, five times.
A data set with two modes is called bimodal. For example,...
There can be more than one mode in a data set if multiple values have the same highest frequency. For instance, suppose that the Statistics exam scores of 20 students are: 50; 53; 59; 59; 63; 63; 72; 72; 72; 72; 72; 76; 78; 81; 83; 84; 84; 84; 90; 93. Here, the mode is 72, as it occurs most frequently, five times.
A data set with two modes is called bimodal. For example,...
25.1K
02:52Resonance
64.8K
The Lewis structure of a nitrite anion (NO2−) may actually be drawn in two different ways, distinguished by the locations of the N-O and N=O bonds.
64.8K
01:08Spin–Spin Coupling Constant: Overview
1.5K
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
1.5K
01:08NMR Spectroscopy: Spin–Spin Coupling
3.0K
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...
3.0K
01:17Spin–Spin Coupling: One-Bond Coupling
1.4K
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,...
1.4K
01:14Ventilatory Modes
1.4K
Mechanical ventilators are life-saving devices that support or replace spontaneous breathing. They deliver breaths to patients through varying methods known as ventilator modes. Understanding these modes is critical for healthcare providers managing patients with respiratory failure.
There are three ventilatory modes: full support, partial support, and spontaneous. These are described below.
Full Support Modes
Full support modes include controlled mechanical ventilation, continuous mandatory...
There are three ventilatory modes: full support, partial support, and spontaneous. These are described below.
Full Support Modes
Full support modes include controlled mechanical ventilation, continuous mandatory...
1.4K