Valley-Hall slow-light waveguide states with dual-band in all-dielectric valley photonic crystals
The slow-light waveguide states protected by topology could be used in strengthening interaction between light and matter, so they can be used for realizing a lot of unique physical optics phenomena and interesting applications. In this work, we consider a kind of all-dielectric valley photonic crys...
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Elsevier
2025-01-01
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| Series: | Results in Physics |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211379724007770 |
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| author | Liu He Jianquan Yao |
| author_facet | Liu He Jianquan Yao |
| author_sort | Liu He |
| collection | DOAJ |
| description | The slow-light waveguide states protected by topology could be used in strengthening interaction between light and matter, so they can be used for realizing a lot of unique physical optics phenomena and interesting applications. In this work, we consider a kind of all-dielectric valley photonic crystals (VPCs) with honeycomb lattice, realize dual-band photonic valley-Hall kink states at the stacking interface composed of two VPCs with mirror symmetry through breaking the parity-reversal symmetry of photonic system, such as low-frequency and high-frequency valley-Hall kink states. The valley-Hall kink states can be classified two categories: guided states and slow-light states, which depends on the magnitude of group index ng. By full-wave simulations, we directly observe that the dual-band valley-Hall slow-light states are in a way of standing-wave-liked modes to transport along the interface, and the more group index ng is, the half-wavelength λL/2 of standing-wave-liked is longer. Based on numerical calculation, the largest group indexes of low-frequency and high-frequency valley-Hall slow-light waveguide states are 1000, 1378, respectively. Hence in theory we can use half-wavelength λL/2 of standing-wave-liked modes to characterize slow-light states instead of judging respond time or fitting dispersion curve, which provides an alternative method or road to directly observe and demonstrate slow-light waveguide states in experiment. |
| format | Article |
| id | doaj-art-1d73d840a9094b5497217636a965ada6 |
| institution | Kabale University |
| issn | 2211-3797 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
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| series | Results in Physics |
| spelling | doaj-art-1d73d840a9094b5497217636a965ada62025-01-18T05:04:33ZengElsevierResults in Physics2211-37972025-01-0168108092Valley-Hall slow-light waveguide states with dual-band in all-dielectric valley photonic crystalsLiu He0Jianquan Yao1Key Laboratory of Opto-Electronics Information Technology (Tianjin University), Ministry of Education, School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, ChinaCorresponding author.; Key Laboratory of Opto-Electronics Information Technology (Tianjin University), Ministry of Education, School of Precision Instruments and Opto-Electronics Engineering, Tianjin University, Tianjin 300072, ChinaThe slow-light waveguide states protected by topology could be used in strengthening interaction between light and matter, so they can be used for realizing a lot of unique physical optics phenomena and interesting applications. In this work, we consider a kind of all-dielectric valley photonic crystals (VPCs) with honeycomb lattice, realize dual-band photonic valley-Hall kink states at the stacking interface composed of two VPCs with mirror symmetry through breaking the parity-reversal symmetry of photonic system, such as low-frequency and high-frequency valley-Hall kink states. The valley-Hall kink states can be classified two categories: guided states and slow-light states, which depends on the magnitude of group index ng. By full-wave simulations, we directly observe that the dual-band valley-Hall slow-light states are in a way of standing-wave-liked modes to transport along the interface, and the more group index ng is, the half-wavelength λL/2 of standing-wave-liked is longer. Based on numerical calculation, the largest group indexes of low-frequency and high-frequency valley-Hall slow-light waveguide states are 1000, 1378, respectively. Hence in theory we can use half-wavelength λL/2 of standing-wave-liked modes to characterize slow-light states instead of judging respond time or fitting dispersion curve, which provides an alternative method or road to directly observe and demonstrate slow-light waveguide states in experiment.http://www.sciencedirect.com/science/article/pii/S2211379724007770Slow-light waveguide statesValley photonic crystals (VPCs)Dual-band valley-Hall kink statesStanding-wave-liked modes |
| spellingShingle | Liu He Jianquan Yao Valley-Hall slow-light waveguide states with dual-band in all-dielectric valley photonic crystals Results in Physics Slow-light waveguide states Valley photonic crystals (VPCs) Dual-band valley-Hall kink states Standing-wave-liked modes |
| title | Valley-Hall slow-light waveguide states with dual-band in all-dielectric valley photonic crystals |
| title_full | Valley-Hall slow-light waveguide states with dual-band in all-dielectric valley photonic crystals |
| title_fullStr | Valley-Hall slow-light waveguide states with dual-band in all-dielectric valley photonic crystals |
| title_full_unstemmed | Valley-Hall slow-light waveguide states with dual-band in all-dielectric valley photonic crystals |
| title_short | Valley-Hall slow-light waveguide states with dual-band in all-dielectric valley photonic crystals |
| title_sort | valley hall slow light waveguide states with dual band in all dielectric valley photonic crystals |
| topic | Slow-light waveguide states Valley photonic crystals (VPCs) Dual-band valley-Hall kink states Standing-wave-liked modes |
| url | http://www.sciencedirect.com/science/article/pii/S2211379724007770 |
| work_keys_str_mv | AT liuhe valleyhallslowlightwaveguidestateswithdualbandinalldielectricvalleyphotoniccrystals AT jianquanyao valleyhallslowlightwaveguidestateswithdualbandinalldielectricvalleyphotoniccrystals |