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| Main Authors: | , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2604.02076 |
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| _version_ | 1866912998908493824 |
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| author | Yu, Youxiu Xu, Xiaofeng Long, Yang Liu, Gui-Geng Gao, Dongliang Lin, Xiao Hu, Hao |
| author_facet | Yu, Youxiu Xu, Xiaofeng Long, Yang Liu, Gui-Geng Gao, Dongliang Lin, Xiao Hu, Hao |
| contents | Guided mode resonance (GMR), the resonant coupling of free-space light into leaky waveguide modes, is traditionally achieved with periodic patterned structures. However, this approach makes its key properties such as quality factor (Q-factor) fabrication-dependent and non-tunable. Here, we introduce a time grating platform, i.e., a homogeneous waveguide whose refractive index is modulated periodically in time, that allows tunable GMRs through temporal modulation engineering rather than spatial structural redesign. We show that the Q-factors of these GMRs diverge as the modulation depth vanishes. Furthermore, unconstrained by energy conservation, the resonances exhibit near-unity reflection for fundamental harmonics and values exceeding 40 for first-order harmonics. Our findings not only apply to yield a giant Goos-Hänchen shift over 103 times wavelength without sacrificing the reflection magnitude, but also open new avenues for related phenomena such as bound states in the continuum, unidirectional GMRs and beyond. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_02076 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | A time grating approach to ultrahigh-Q guided mode resonance Yu, Youxiu Xu, Xiaofeng Long, Yang Liu, Gui-Geng Gao, Dongliang Lin, Xiao Hu, Hao Optics Guided mode resonance (GMR), the resonant coupling of free-space light into leaky waveguide modes, is traditionally achieved with periodic patterned structures. However, this approach makes its key properties such as quality factor (Q-factor) fabrication-dependent and non-tunable. Here, we introduce a time grating platform, i.e., a homogeneous waveguide whose refractive index is modulated periodically in time, that allows tunable GMRs through temporal modulation engineering rather than spatial structural redesign. We show that the Q-factors of these GMRs diverge as the modulation depth vanishes. Furthermore, unconstrained by energy conservation, the resonances exhibit near-unity reflection for fundamental harmonics and values exceeding 40 for first-order harmonics. Our findings not only apply to yield a giant Goos-Hänchen shift over 103 times wavelength without sacrificing the reflection magnitude, but also open new avenues for related phenomena such as bound states in the continuum, unidirectional GMRs and beyond. |
| title | A time grating approach to ultrahigh-Q guided mode resonance |
| topic | Optics |
| url | https://arxiv.org/abs/2604.02076 |