Related Experiment Video
Updated: Jul 19, 2025
06:53
Scanning SQUID Study of Vortex Manipulation by Local Contact
Published on: February 1, 2017
6.9K
Chiral Mechanical Effect of the Tightly Focused Chiral Vector Vortex Fields Interacting with Particles
Qiang Zhang1, Zhirong Liu1, Ziqiang Cheng1
1Department of Applied Physics, East China Jiaotong University, Nanchang 330013, China.
Nanomaterials (Basel, Switzerland)
|August 12, 2023
Summary
Researchers developed a method to create superchiral optical fields, enabling chiral forces that manipulate particle motion based on their chirality. This advances optical separation and manipulation techniques for chiral particles.
Area of Science:
- Optics and Photonics
- Chiral Physics
- Microscopy
Background:
- Localized optical fields can exhibit chirality through photon spin-orbit coupling.
- Chiral light fields offer potential for novel particle manipulation.
- Understanding chiral forces is crucial for advanced optical applications.
Purpose of the Study:
- To present a scheme for generating a superchiral optical field in a 4π microscopic system.
- To investigate the optical forces and torques exerted by this chiral field on chiral dipoles.
- To reveal and characterize chiral mechanical effects on particles.
Main Methods:
- Tightly focusing two counter-propagating spiral wavefronts to create a superchiral field.
- Calculating optical forces and torques on chiral dipoles within the generated field.
- Analyzing chirality density and flux to understand chiral force components.
Main Results:
- A superchiral optical field was successfully produced in a 4π microscopic system.
- Chiral forces, in addition to general optical forces, were identified, directly correlating with particle chirality.
- The chiral mechanical effect was characterized by chirality density and flux, linked to reactive and dissipative force components.
Conclusions:
- The study demonstrates a method to generate superchiral fields for enhanced optical chirality.
- Chiral forces significantly influence particle motion, offering new manipulation possibilities.
- This work provides a foundation for advanced optical separation and manipulation of chiral particles.
Related Concept Videos
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
24.4K
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...
24.4K
02:25Molecules with Multiple Chiral Centers
11.8K
Molecules that possess multiple chiral centers can afford a large number of stereoisomers. For instance, while some molecules like 2-butanol have one chiral center, defined as a tetrahedral carbon atom with four different substituents attached, several molecules like butane-2,3-diol have multiple chiral centers. A simple formula to predict the number of stereoisomers possible for a molecule with n chiral centers is 2n. However, there can be a lower number where some of the stereoisomers are...
11.8K
01:22Motion Of A Charged Particle In A Magnetic Field
4.9K
A charged particle experiences a force when moving through a magnetic field. Consider the field to be uniform and the charged particle to move perpendicular to it. If the field is in a vacuum, the magnetic field is the dominant factor determining the motion. Since the magnetic force is perpendicular to the direction of motion, a charged particle follows a curved path. The particle continues to follow this curved path until it forms a complete circle. Another way to look at this is that the...
4.9K
02:05Prochirality
3.8K
The concept of prochirality leads to the nomenclature of the individual faces of a molecule and plays a crucial role in the enantioselective reaction. It is a concept where two or more achiral molecules react to produce chiral products. A typical process is the reaction of an achiral ketone to generate a chiral alcohol. Here, the achiral reactant reacts with an achiral reducing agent, sodium borohydride, to generate an equimolar mixture of the chiral enantiomers of the product. For example, an...
3.8K
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