Related Experiment Video
Updated: Jul 16, 2025
08:51
Coulomb Explosion Imaging as a Tool to Distinguish Between Stereoisomers
Published on: August 18, 2017
10.4K
Enhanced optical forces on coupled chiral particles at arbitrary order exceptional points.
Optics Express
|September 15, 2023
Summary
Researchers studied optical forces on chiral particles near exceptional points (EPs) in non-Hermitian systems. They found enhanced optical forces at EPs, with a unique skin effect observed, paving the way for novel optical tweezers.
Area of Science:
- Photonics and optical physics
- Non-Hermitian systems
- Chiral particle manipulation
Background:
- Exceptional points (EPs) are degeneracies in non-Hermitian systems where eigenvalues and eigenvectors coalesce.
- EPs in optical systems can lead to unique phenomena.
- Understanding optical forces in these systems is crucial for advanced applications.
Purpose of the Study:
- To investigate optical forces acting on chiral particles in a non-Hermitian system at EPs.
- To explore the influence of higher-order EPs on optical forces.
- To analyze the spatial distribution of optical forces, including potential "skin effects".
Main Methods:
- Utilizing unidirectional coupling of chiral particles on a dielectric waveguide.
- Excitation using a linearly polarized plane wave.
- Employing full-wave numerical simulations to analyze optical forces.
Main Results:
- Demonstrated enhanced optical forces at EPs.
- Observed that higher-order EPs generally induce stronger optical forces.
- Identified a "skin effect" where optical forces are maximized at one end of the chiral particle lattice.
Conclusions:
- Optical forces are significantly enhanced at exceptional points in non-Hermitian systems.
- The "skin effect" offers a novel mechanism for localized particle manipulation.
- Findings advance the understanding of optical forces in non-Hermitian photonics and optical tweezers design.
Related Concept Videos
02:24Properties of Enantiomers and Optical Activity
17.2K
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,...
17.2K
02:30Chirality in Nature
13.5K
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.
13.5K
02:25Chirality
24.3K
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...
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...
24.3K
01:27¹H NMR: Long-Range Coupling
1.8K
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...
1.8K
02:30Chirality at Nitrogen, Phosphorus, and Sulfur
5.8K
Chirality is most prevalent in carbon-based tetrahedral compounds, but this important facet of molecular symmetry extends to sp3-hybridized nitrogen, phosphorus and sulfur centers, including trivalent molecules with lone pairs. Here, the lone pair behaves as a functional group in addition to the other three substituents to form an analogous tetrahedral center that can be chiral.
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
A consequence of chirality is the need for enantiomeric resolution. While this is theoretically possible for all...
5.8K
02:52Stereoisomerism
12.0K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
Isomers are different chemical species that have the same chemical formula.
Transition metal complexes often exist as geometric isomers, in which the same atoms are connected through the same types of bonds but with differences in their orientation in space. Coordination complexes with two different ligands in the cis and trans positions from a ligand of interest form isomers. For example, the octahedral [Co(NH3)4Cl2]+ ion has two isomers (Figure 1) In the cis...
12.0K