Tools
Tools
You, S., Zhou, M., Xu, L. 
ORCID: 0000-0001-9071-4311, Chen, D., Fan, M., Huang, J., Ma, W., Luo, S., Rahmani, M. ORCID: 0000-0001-9268-4793, Zhou, C., Miroshnichenko, A.E. and Huang, L.,
2023.
Quasi-bound states in the continuum with a stable resonance wavelength in dimer dielectric metasurfaces.
Nanophotonics, 12 (11), pp. 2051-2060.
ISSN 2192-8606
|
Text
1850842_Xu.pdf - Published version Download (3MB) | Preview |
Abstract
Symmetry-protected bound states in the continuum (SP-BICs) are one of the most intensively studied BICs. Typically, SP-BICs must be converted into quasi-BICs (QBICs) by breaking the unit cell’s symmetry so that they can be accessed by the external excitation. The symmetry-broken usually results in a varied resonance wavelength of QBICs which are also highly sensitive to the asymmetry parameters. In this work, we demonstrate that QBICs with a stable resonance wavelength can be realized by breaking translational symmetry in an all-dielectric metasurface. The unit cell of metasurface is made of a silicon nanodisk dimer. The Q-factor of QBICs is precisely tuned by changing the interspacing of two nanodisks while their resonance wavelength is quite stable against the interspacing. We also find that such BICs show weak dependence on the shape of the nanodisk. Multiple decompositions indicate that the toroidal dipole dominates this type of QBIC. The resonance wavelengths of QBICs can be tuned only by changing either the lattice constants or the radius of nanodisk. Finally, we present experimental demonstrations on such a QBIC with a stable resonance wavelength. The highest measured Q-factor of QBICs is >3000. Our results may find promising applications in enhancing light–matter interaction.
| Item Type: | Journal article | ||||||
|---|---|---|---|---|---|---|---|
| Publication Title: | Nanophotonics | ||||||
| Creators: | You, S., Zhou, M., Xu, L., Chen, D., Fan, M., Huang, J., Ma, W., Luo, S., Rahmani, M., Zhou, C., Miroshnichenko, A.E. and Huang, L. | ||||||
| Publisher: | Walter de Gruyter GmbH | ||||||
| Date: | May 2023 | ||||||
| Volume: | 12 | ||||||
| Number: | 11 | ||||||
| ISSN: | 2192-8606 | ||||||
| Identifiers: |
|
||||||
| Rights: | © 2023 the author(s), published by De Gruyter, Berlin/Boston. This work is licensed under the Creative Commons Attribution 4.0 International License. | ||||||
| Divisions: | Schools > School of Science and Technology | ||||||
| Record created by: | Laura Ward | ||||||
| Date Added: | 11 Jan 2024 16:58 | ||||||
| Last Modified: | 11 Jan 2024 16:58 | ||||||
| URI: | https://irep.ntu.ac.uk/id/eprint/50671 |
Actions (login required)
 |
Edit View |
Views
Views per month over past year
Downloads
Downloads per month over past year
