High-Q quasi-BIC in photonic crystal nanobeam for ultrahigh sensitivity refractive index sensing
We propose and numerically demonstrate the existence of bound state in the continuum (BIC) in silicon-based one-dimensional photonic crystal nanobeam (1D-PCN). The 1D-PCN is formed by introducing rectangular air nanoholes in a simple 1D nanobeam waveguide. By engineering the structure parameters, an...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2023-04-01
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| Series: | Results in Physics |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S2211379723000979 |
| _version_ | 1827972773668978688 |
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| author | Bing Duan Songyi Liu Xiao Liu Xiao-chong Yu Chuan Wang Daquan Yang |
| author_facet | Bing Duan Songyi Liu Xiao Liu Xiao-chong Yu Chuan Wang Daquan Yang |
| author_sort | Bing Duan |
| collection | DOAJ |
| description | We propose and numerically demonstrate the existence of bound state in the continuum (BIC) in silicon-based one-dimensional photonic crystal nanobeam (1D-PCN). The 1D-PCN is formed by introducing rectangular air nanoholes in a simple 1D nanobeam waveguide. By engineering the structure parameters, an ideal BIC with infinite quality (Q) factor is demonstrated in 1D-PCN. On this basis, we further investigate the refractive index sensing performance with quasi-BIC by introducing defects into the aforementioned 1D-PCN structure, and an ultrahigh Q factor of ∼ 4.1 × 107 is obtained. Compared to the conventional sensing mechanism based on the shift of forbidden bands modes, the 1D-PCN sensor based on quasi-BIC has a comparable figure of merit (FOM) higher than 106. It is worth mentioning that the quasi-BIC can be directly excited by external light sources without the special coupling mechanism, which provides a new method for ultrasensitive refractive index sensing. |
| first_indexed | 2024-04-09T19:25:34Z |
| format | Article |
| id | doaj.art-6db50777992444c8875e92b6fc4dc36c |
| institution | Directory Open Access Journal |
| issn | 2211-3797 |
| language | English |
| last_indexed | 2024-04-09T19:25:34Z |
| publishDate | 2023-04-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Results in Physics |
| spelling | doaj.art-6db50777992444c8875e92b6fc4dc36c2023-04-05T08:12:02ZengElsevierResults in Physics2211-37972023-04-0147106304High-Q quasi-BIC in photonic crystal nanobeam for ultrahigh sensitivity refractive index sensingBing Duan0Songyi Liu1Xiao Liu2Xiao-chong Yu3Chuan Wang4Daquan Yang5State Key Laboratory of Information Photonics and Optical Communications, and School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, ChinaGuangxi Key Laboratory of Optoelectronic Information Processing, School of Optoelectronic Engineering, Guilin University of Electronic Technology, Guilin 541004, ChinaState Key Laboratory of Information Photonics and Optical Communications, and School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, ChinaApplied Optics Beijing Area Major Laboratory, Beijing Normal University, Beijing 100875, ChinaSchool of Artificial Intelligence, Beijing Normal University, Beijing 100875, ChinaState Key Laboratory of Information Photonics and Optical Communications, and School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China; School of Information Science and Technology, Tibet University, Lhasa 850000, ChinaWe propose and numerically demonstrate the existence of bound state in the continuum (BIC) in silicon-based one-dimensional photonic crystal nanobeam (1D-PCN). The 1D-PCN is formed by introducing rectangular air nanoholes in a simple 1D nanobeam waveguide. By engineering the structure parameters, an ideal BIC with infinite quality (Q) factor is demonstrated in 1D-PCN. On this basis, we further investigate the refractive index sensing performance with quasi-BIC by introducing defects into the aforementioned 1D-PCN structure, and an ultrahigh Q factor of ∼ 4.1 × 107 is obtained. Compared to the conventional sensing mechanism based on the shift of forbidden bands modes, the 1D-PCN sensor based on quasi-BIC has a comparable figure of merit (FOM) higher than 106. It is worth mentioning that the quasi-BIC can be directly excited by external light sources without the special coupling mechanism, which provides a new method for ultrasensitive refractive index sensing.http://www.sciencedirect.com/science/article/pii/S2211379723000979BICOne-dimensional photonic crystal nanobeamquasi-BICRefractive index sensing |
| spellingShingle | Bing Duan Songyi Liu Xiao Liu Xiao-chong Yu Chuan Wang Daquan Yang High-Q quasi-BIC in photonic crystal nanobeam for ultrahigh sensitivity refractive index sensing Results in Physics BIC One-dimensional photonic crystal nanobeam quasi-BIC Refractive index sensing |
| title | High-Q quasi-BIC in photonic crystal nanobeam for ultrahigh sensitivity refractive index sensing |
| title_full | High-Q quasi-BIC in photonic crystal nanobeam for ultrahigh sensitivity refractive index sensing |
| title_fullStr | High-Q quasi-BIC in photonic crystal nanobeam for ultrahigh sensitivity refractive index sensing |
| title_full_unstemmed | High-Q quasi-BIC in photonic crystal nanobeam for ultrahigh sensitivity refractive index sensing |
| title_short | High-Q quasi-BIC in photonic crystal nanobeam for ultrahigh sensitivity refractive index sensing |
| title_sort | high q quasi bic in photonic crystal nanobeam for ultrahigh sensitivity refractive index sensing |
| topic | BIC One-dimensional photonic crystal nanobeam quasi-BIC Refractive index sensing |
| url | http://www.sciencedirect.com/science/article/pii/S2211379723000979 |
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