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De Carlo M, De Leonardis F, Dell'Olio F, Ding Y, Passaro VMN. Dissipative coupling in a Bragg-grating-coupled single resonator with Fano resonance for anti-PT-symmetric gyroscopes. OPTICS EXPRESS 2024; 32:5932-5942. [PMID: 38439308 DOI: 10.1364/oe.510617] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2023] [Accepted: 01/24/2024] [Indexed: 03/06/2024]
Abstract
Anti-parity-time-symmetric Hamiltonians show an enhanced sensitivity to external perturbations that can be used for high-performance angular velocity sensing. Dissipative coupling is a valuable way for realizing anti-PT-symmetric Hamiltonians with optical resonators and is usually obtained by means of auxiliary waveguides. Here, we model and experimentally show the dissipative coupling between two counterpropagating modes of a single resonator, by means of a Bragg-grating placed in the feeding bus. The proposed solution enables the possibility of accurately designing the dissipative coupling strength in integrated non-Hermitian gyroscopes, thus providing high flexibility in the design of the proposed sensor. Moreover, we theoretically and experimentally demonstrate that the dissipative coupling between two counterpropagating modes of the same resonant cavity can give rise to an asymmetric Fano resonance.
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Wang T, Niu Y. Defect modes in defective one dimensional parity-time symmetric photonic crystal. Sci Rep 2023; 13:21338. [PMID: 38049510 PMCID: PMC10696044 DOI: 10.1038/s41598-023-48737-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2023] [Accepted: 11/29/2023] [Indexed: 12/06/2023] Open
Abstract
The introduction of defect layers into one-dimensional parity-time (PT) symmetric photonic crystals gives rise to resonances within the photonic bandgaps. These resonances can be effectively explained by our generalized temporal coupled mode theory. The scattering properties and dispersion relation of defect modes exhibit distinct characteristics compared to conventional one-dimensional Hermitian photonic crystals with defect layers. By tuning the non-Hermiticity or other model parameters, the modulus of the generalized decay rate can be reduced, consequently, the electric field concentrated within the defect layer strengthens. This arises due to the unique band structure of one-dimensional PT-symmetric photonic crystals, which differs significantly from that of traditional one-dimensional Hermitian photonic crystals. Furthermore, the interaction between multiple resonances is investigated through the introduction of multiple defect layers. Our study not only provides insights into resonance phenomena in defective non-Hermitian systems but also contributes to the design of relevant optical resonance devices.
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Affiliation(s)
- Tiecheng Wang
- College of Physics and Electronic Engineering, Shanxi University, 030006, Taiyuan, China.
| | - Yong Niu
- Institute of Theoretical Physics, Shanxi University, Taiyuan, 030006, China
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Pei R, Liu D, Zhang Q, Shi Z, Sun Y, Liu X, Wang J. Fluctuation of Plasmonically Induced Transparency Peaks within Multi-Rectangle Resonators. SENSORS (BASEL, SWITZERLAND) 2022; 23:226. [PMID: 36616824 PMCID: PMC9823394 DOI: 10.3390/s23010226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 12/12/2022] [Accepted: 12/21/2022] [Indexed: 06/17/2023]
Abstract
Numerical investigations were conducted of the plasmonically induced transparency (PIT) effect observed in a metal-insulator-metal waveguide coupled to asymmetric three-rectangle resonators, wherein, of the two PIT peaks that were generated, one PIT peak fell while the other PIT peak rose. PIT has been widely studied due to its sensing, slow light, and nonlinear effects, and it has a high potential for use in optical communication systems. To gain a better understanding of the PIT effect in multi-rectangle resonators, its corresponding properties, effects, and performance were numerically investigated based on PIT peak fluctuations. By modifying geometric parameters and filling dielectrics, we not only realized the off-to-on PIT optical response within single or double peaks but also obtained the peak fluctuation. Furthermore, our findings were found to be consistent with those of finite element simulations. These proposed structures have wide potential for use in sensing applications.
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Affiliation(s)
- Ruoyu Pei
- Xinjiang Laboratory of Phase Transitions and Microstructures in Condensed Matters, College of Physical Science and Technology, Yili Normal University, Yining 835000, China
| | - Dongdong Liu
- Xinjiang Laboratory of Phase Transitions and Microstructures in Condensed Matters, College of Physical Science and Technology, Yili Normal University, Yining 835000, China
- State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China
- School of Physics and New Energy, Xuzhou University of Technology, Xuzhou 221018, China
| | - Qun Zhang
- School of Physics and New Energy, Xuzhou University of Technology, Xuzhou 221018, China
| | - Zhe Shi
- School of Physics and New Energy, Xuzhou University of Technology, Xuzhou 221018, China
| | - Yan Sun
- State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China
- School of Physics and New Energy, Xuzhou University of Technology, Xuzhou 221018, China
| | - Xi Liu
- State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China
- School of Physics and New Energy, Xuzhou University of Technology, Xuzhou 221018, China
| | - Jicheng Wang
- State Key Laboratory of Millimeter Waves, Southeast University, Nanjing 210096, China
- School of Science, Jiangnan University, Wuxi 214122, China
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