Momentum mismatch driven bound states in the continuum and ellipsometric phase singularities
In this paper, we elucidate the formation of bound states in the continuum (BICs) in compound grating waveguide structures from the perspective of momentum mismatch. As the complex lattice reduces to a simple lattice, the excitable guided resonance turns into an unexcitable BIC due to momentum misma...
| Main Authors: | , , , , , , , , , , |
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| Other Authors: | |
| Format: | Journal Article |
| Language: | English |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/178325 |
| _version_ | 1811683542655041536 |
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| author | Wu, Feng Qi, Xin Qin, Meibao Luo, Ma Long, Yang Wu, Jiaju Sun, Yong Jiang, Haitao Liu, Tingting Xiao, Shuyuan Chen, Hong |
| author2 | School of Physical and Mathematical Sciences |
| author_facet | School of Physical and Mathematical Sciences Wu, Feng Qi, Xin Qin, Meibao Luo, Ma Long, Yang Wu, Jiaju Sun, Yong Jiang, Haitao Liu, Tingting Xiao, Shuyuan Chen, Hong |
| author_sort | Wu, Feng |
| collection | NTU |
| description | In this paper, we elucidate the formation of bound states in the continuum (BICs) in compound grating waveguide structures from the perspective of momentum mismatch. As the complex lattice reduces to a simple lattice, the excitable guided resonance turns into an unexcitable BIC due to momentum mismatch. Herein, we refer to this state as momentum mismatch driven BIC. Interestingly, as the incidence changes from normal to oblique, the single momentum mismatch driven BIC splits into dual momentum mismatch driven BICs due to the nonzero tangential momentum of the incident light. Distinct from conventional symmetry-protected and accidental BICs, momentum mismatch driven BICs lie in sections of photonic bands. Consequently, Q factors of momentum mismatch driven quasi-BICs exhibit angular robustness far beyond conventional symmetry-protected and accidental quasi-BICs. Empowered by the momentum mismatch driven BIC, a pair of ellipsometric phase singularities emerge. Enabled by the drastic ellipsometric phase change, ultrasensitive refractive index sensing can be achieved. These results not only provide unique insights into the relation between momentum, BICs, and ellipsometric phase, but also offer a recipe for developing high-performance phase-based optical devices, such as ultrasensitive sensors, wave plates, and spatial light modulators. |
| first_indexed | 2024-10-01T04:14:24Z |
| format | Journal Article |
| id | ntu-10356/178325 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T04:14:24Z |
| publishDate | 2024 |
| record_format | dspace |
| spelling | ntu-10356/1783252024-06-17T15:34:23Z Momentum mismatch driven bound states in the continuum and ellipsometric phase singularities Wu, Feng Qi, Xin Qin, Meibao Luo, Ma Long, Yang Wu, Jiaju Sun, Yong Jiang, Haitao Liu, Tingting Xiao, Shuyuan Chen, Hong School of Physical and Mathematical Sciences Physics Compound grating Grating waveguide structures In this paper, we elucidate the formation of bound states in the continuum (BICs) in compound grating waveguide structures from the perspective of momentum mismatch. As the complex lattice reduces to a simple lattice, the excitable guided resonance turns into an unexcitable BIC due to momentum mismatch. Herein, we refer to this state as momentum mismatch driven BIC. Interestingly, as the incidence changes from normal to oblique, the single momentum mismatch driven BIC splits into dual momentum mismatch driven BICs due to the nonzero tangential momentum of the incident light. Distinct from conventional symmetry-protected and accidental BICs, momentum mismatch driven BICs lie in sections of photonic bands. Consequently, Q factors of momentum mismatch driven quasi-BICs exhibit angular robustness far beyond conventional symmetry-protected and accidental quasi-BICs. Empowered by the momentum mismatch driven BIC, a pair of ellipsometric phase singularities emerge. Enabled by the drastic ellipsometric phase change, ultrasensitive refractive index sensing can be achieved. These results not only provide unique insights into the relation between momentum, BICs, and ellipsometric phase, but also offer a recipe for developing high-performance phase-based optical devices, such as ultrasensitive sensors, wave plates, and spatial light modulators. Published version This work is supported by the National Natural Science Foundation of China (Grants No. 12104105, No. 12364045, No. 12304420, No. 12264028, No. 12364049, No. 12274325, No. 91850206, and No. 11974261), the National Key Research and Development Program of China (Grant No. 2021YFA1400602), the Guangdong Basic and Applied Basic Research Foundation (Grant No. 2023A1515011024), the Science and Technology Program of Guangzhou (Grant No. 202201011176), the Natural Science Foundation of Jiangxi Province (Grants No. 20232BAB211025 and No. 20232BAB201040), the Start-up Funding of Guangdong Polytechnic Normal University (Grant No. 2021SDKYA033), and the Start-up Funding of Nanchang Institute of Science and Technology (Grant No. NGRCZX-23–01). 2024-06-12T01:21:45Z 2024-06-12T01:21:45Z 2024 Journal Article Wu, F., Qi, X., Qin, M., Luo, M., Long, Y., Wu, J., Sun, Y., Jiang, H., Liu, T., Xiao, S. & Chen, H. (2024). Momentum mismatch driven bound states in the continuum and ellipsometric phase singularities. Physical Review B, 109(8), 085436-. https://dx.doi.org/10.1103/PhysRevB.109.085436 2469-9950 https://hdl.handle.net/10356/178325 10.1103/PhysRevB.109.085436 2-s2.0-85186349968 8 109 085436 en Physical Review B © 2024 The Authors. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. application/pdf |
| spellingShingle | Physics Compound grating Grating waveguide structures Wu, Feng Qi, Xin Qin, Meibao Luo, Ma Long, Yang Wu, Jiaju Sun, Yong Jiang, Haitao Liu, Tingting Xiao, Shuyuan Chen, Hong Momentum mismatch driven bound states in the continuum and ellipsometric phase singularities |
| title | Momentum mismatch driven bound states in the continuum and ellipsometric phase singularities |
| title_full | Momentum mismatch driven bound states in the continuum and ellipsometric phase singularities |
| title_fullStr | Momentum mismatch driven bound states in the continuum and ellipsometric phase singularities |
| title_full_unstemmed | Momentum mismatch driven bound states in the continuum and ellipsometric phase singularities |
| title_short | Momentum mismatch driven bound states in the continuum and ellipsometric phase singularities |
| title_sort | momentum mismatch driven bound states in the continuum and ellipsometric phase singularities |
| topic | Physics Compound grating Grating waveguide structures |
| url | https://hdl.handle.net/10356/178325 |
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