Optical forces in coupled chiral particles
Structural chirality can induce counter-intuitive optical forces due to inherent symmetry properties. While optical forces on a single chiral particle in the Rayleigh regime have been well studied, optical forces in coupled chiral particles remain less explored. By using full-wave numerical simulati...
| Main Authors: | , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2020
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/145488 |
| _version_ | 1826116654839365632 |
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| author | Wo, Kah Jen Peng, Jie Prasad, Madhava Krishna Shi, Yuzhi Li, Jensen Wang, Shubo |
| author2 | School of Electrical and Electronic Engineering |
| author_facet | School of Electrical and Electronic Engineering Wo, Kah Jen Peng, Jie Prasad, Madhava Krishna Shi, Yuzhi Li, Jensen Wang, Shubo |
| author_sort | Wo, Kah Jen |
| collection | NTU |
| description | Structural chirality can induce counter-intuitive optical forces due to inherent symmetry properties. While optical forces on a single chiral particle in the Rayleigh regime have been well studied, optical forces in coupled chiral particles remain less explored. By using full-wave numerical simulations and analytical methods of source representation and coupled mode theory, we investigated the optical forces induced by a plane wave on two chiral particles coupling with each other via the evanescent near fields. We found that the induced electric and magnetic dipoles of the chiral particles have complicated couplings that give rise to dark and bright modes. The interaction force between the particles can be either attractive or repulsive, and its magnitude can be significantly enhanced by the resonance modes. The attractive force is much stronger if two particles are of opposite handedness compared with the case of same handedness. The electric dipole force and the magnetic dipole force have the same sign for two particles with the same handedness, while they are of different signs for two particles with opposite handedness. The results an lead to a better understanding of chirality-induced optical forces with potential applications in optical manipulations and chiral light-matter interactions. |
| first_indexed | 2024-10-01T04:15:05Z |
| format | Journal Article |
| id | ntu-10356/145488 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:15:05Z |
| publishDate | 2020 |
| record_format | dspace |
| spelling | ntu-10356/1454882020-12-23T01:27:32Z Optical forces in coupled chiral particles Wo, Kah Jen Peng, Jie Prasad, Madhava Krishna Shi, Yuzhi Li, Jensen Wang, Shubo School of Electrical and Electronic Engineering Science::Physics::Optics and light Optical Forces Coupled Structural chirality can induce counter-intuitive optical forces due to inherent symmetry properties. While optical forces on a single chiral particle in the Rayleigh regime have been well studied, optical forces in coupled chiral particles remain less explored. By using full-wave numerical simulations and analytical methods of source representation and coupled mode theory, we investigated the optical forces induced by a plane wave on two chiral particles coupling with each other via the evanescent near fields. We found that the induced electric and magnetic dipoles of the chiral particles have complicated couplings that give rise to dark and bright modes. The interaction force between the particles can be either attractive or repulsive, and its magnitude can be significantly enhanced by the resonance modes. The attractive force is much stronger if two particles are of opposite handedness compared with the case of same handedness. The electric dipole force and the magnetic dipole force have the same sign for two particles with the same handedness, while they are of different signs for two particles with opposite handedness. The results an lead to a better understanding of chirality-induced optical forces with potential applications in optical manipulations and chiral light-matter interactions. Published version 2020-12-23T01:27:32Z 2020-12-23T01:27:32Z 2020 Journal Article Wo, K. J., Peng, J., Prasad, M. K., Shi, Y., Li, J., & Wang, S. (2020). Optical forces in coupled chiral particles. Physical Review A, 102(4), 043526-. doi:10.1103/PhysRevA.102.043526 2469-9926 https://hdl.handle.net/10356/145488 10.1103/PhysRevA.102.043526 4 102 en Physical Review A © 2020 American Physical Society. All rights reserved. This paper was published in Physical Review A and is made available with permission of American Physical Society. application/pdf |
| spellingShingle | Science::Physics::Optics and light Optical Forces Coupled Wo, Kah Jen Peng, Jie Prasad, Madhava Krishna Shi, Yuzhi Li, Jensen Wang, Shubo Optical forces in coupled chiral particles |
| title | Optical forces in coupled chiral particles |
| title_full | Optical forces in coupled chiral particles |
| title_fullStr | Optical forces in coupled chiral particles |
| title_full_unstemmed | Optical forces in coupled chiral particles |
| title_short | Optical forces in coupled chiral particles |
| title_sort | optical forces in coupled chiral particles |
| topic | Science::Physics::Optics and light Optical Forces Coupled |
| url | https://hdl.handle.net/10356/145488 |
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