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Zhong H, He T, Meng Y, Xiao Q. Photonic Bound States in the Continuum in Nanostructures. MATERIALS (BASEL, SWITZERLAND) 2023; 16:7112. [PMID: 38005042 PMCID: PMC10672634 DOI: 10.3390/ma16227112] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Revised: 11/02/2023] [Accepted: 11/08/2023] [Indexed: 11/26/2023]
Abstract
Bound states in the continuum (BIC) have garnered considerable attention recently for their unique capacity to confine electromagnetic waves within an open or non-Hermitian system. Utilizing a variety of light confinement mechanisms, nanostructures can achieve ultra-high quality factors and intense field localization with BIC, offering advantages such as long-living resonance modes, adaptable light control, and enhanced light-matter interactions, paving the way for innovative developments in photonics. This review outlines novel functionality and performance enhancements by synergizing optical BIC with diverse nanostructures, delivering an in-depth analysis of BIC designs in gratings, photonic crystals, waveguides, and metasurfaces. Additionally, we showcase the latest advancements of BIC in 2D material platforms and suggest potential trajectories for future research.
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Affiliation(s)
| | | | | | - Qirong Xiao
- State Key Laboratory of Precision Measurement Technology and Instruments, Department of Precision Instrument, Tsinghua University, Beijing 100084, China; (H.Z.); (T.H.); (Y.M.)
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Chern RL, Chang JC, Yang HC. Bound states in the continuum in anisotropic photonic crystal slabs. Sci Rep 2023; 13:14139. [PMID: 37644043 PMCID: PMC10465559 DOI: 10.1038/s41598-023-40869-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Accepted: 08/17/2023] [Indexed: 08/31/2023] Open
Abstract
We investigate the bound states in the continuum (BICs) in photonic crystal slabs composed of alternating anisotropic and isotropic dielectric materials. According to the orientation of optical axis plane, three different configurations are proposed for analyzing various types of BICs, associated with extremely large quality factors and vanishing spectral linewidths. In particular, symmetry-protected (SP) BICs exist at the Brillouin zone center for zero rotation angle of the optical axis, which exhibit antisymmetric field patterns that are decoupled from the symmetric radiating fields. Accidental BICs and Friedrich-Wintgen (FW) BICs also occur at the Brillouin zone center for particular rotation angles of the optical axis. The former emerge on isolated bands with quasi-symmetric or quasi-antisymmetric field patterns, while the latter appear near the avoided crossing between two dispersion bands. At off the Brillouin zone center, SP BICs do not exist while accidental BICs and FW BICs appear at particular optical axis rotation angles, with similar features but somewhat more asymmetric field patterns than those at the Brillouin zone center.
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Affiliation(s)
- Ruey-Lin Chern
- Institute of Applied Mechanics, National Taiwan University, Taipei, 106, Taiwan.
| | - Jui-Chien Chang
- Institute of Applied Mechanics, National Taiwan University, Taipei, 106, Taiwan
| | - Hsueh-Chi Yang
- Institute of Applied Mechanics, National Taiwan University, Taipei, 106, Taiwan
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Maggiolini E, Polimeno L, Todisco F, Di Renzo A, Han B, De Giorgi M, Ardizzone V, Schneider C, Mastria R, Cannavale A, Pugliese M, De Marco L, Rizzo A, Maiorano V, Gigli G, Gerace D, Sanvitto D, Ballarini D. Strongly enhanced light-matter coupling of monolayer WS 2 from a bound state in the continuum. NATURE MATERIALS 2023; 22:964-969. [PMID: 37217703 DOI: 10.1038/s41563-023-01562-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Accepted: 04/21/2023] [Indexed: 05/24/2023]
Abstract
Exciton-polaritons derived from the strong light-matter interaction of an optical bound state in the continuum with an excitonic resonance can inherit an ultralong radiative lifetime and significant nonlinearities, but their realization in two-dimensional semiconductors remains challenging at room temperature. Here we show strong light-matter interaction enhancement and large exciton-polariton nonlinearities at room temperature by coupling monolayer tungsten disulfide excitons to a topologically protected bound state in the continuum moulded by a one-dimensional photonic crystal, and optimizing for the electric-field strength at the monolayer position through Bloch surface wave confinement. By a structured optimization approach, the coupling with the active material is maximized here in a fully open architecture, allowing to achieve a 100 meV photonic bandgap with the bound state in the continuum in a local energy minimum and a Rabi splitting of 70 meV, which results in very high cooperativity. Our architecture paves the way to a class of polariton devices based on topologically protected and highly interacting bound states in the continuum.
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Grants
- ECOTEC project Ministero dell'Istruzione, dell'Università e della Ricerca (Ministry of Education, University and Research)
- TECNOMED Ministero dell'Istruzione, dell'Università e della Ricerca (Ministry of Education, University and Research)
- PRIN 2017P9FJBS Ministero dell'Istruzione, dell'Università e della Ricerca (Ministry of Education, University and Research)
- PNRR NQSTI Ministero dell'Istruzione, dell'Università e della Ricerca (Ministry of Education, University and Research)
- PNRR I-PHOQS Ministero dell'Istruzione, dell'Università e della Ricerca (Ministry of Education, University and Research)
- Joint Bilateral Agreement CNR-RFBR -Triennal program 2021/2023 Russian Foundation for Basic Research (RFBR)
- Novel photonic platform for neuromorphic computing Ministero degli Affari Esteri e della Cooperazione Internazionale (Ministry of Foreign Affairs and International Cooperation)
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Affiliation(s)
- Eugenio Maggiolini
- CNR NANOTEC, Institute of Nanotechnology, Lecce, Italy
- Dipartimento di Fisica, Università di Pavia, Pavia, Italy
| | | | | | - Anna Di Renzo
- CNR NANOTEC, Institute of Nanotechnology, Lecce, Italy
- Dipartimento di Matematica e Fisica E. De Giorgi, Università del Salento, Lecce, Italy
| | - Bo Han
- Institute of Physics, University of Oldenburg, Oldenburg, Germany
| | | | | | | | | | - Alessandro Cannavale
- CNR NANOTEC, Institute of Nanotechnology, Lecce, Italy
- Department of Civil Engineering Sciences and Architecture, Polytechnic University of Bari, Bari, Italy
| | | | | | - Aurora Rizzo
- CNR NANOTEC, Institute of Nanotechnology, Lecce, Italy
| | | | - Giuseppe Gigli
- CNR NANOTEC, Institute of Nanotechnology, Lecce, Italy
- Dipartimento di Matematica e Fisica E. De Giorgi, Università del Salento, Lecce, Italy
| | - Dario Gerace
- Dipartimento di Fisica, Università di Pavia, Pavia, Italy
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Liu J, Chen C, Li X, Li J, Dong D, Liu Y, Fu Y. Tunable dual quasi-bound states in continuum and electromagnetically induced transparency enabled by the broken material symmetry in all-dielectric compound gratings. OPTICS EXPRESS 2023; 31:4347-4356. [PMID: 36785405 DOI: 10.1364/oe.479755] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2022] [Accepted: 01/08/2023] [Indexed: 06/18/2023]
Abstract
Dual quasi-bound states in continuum (quasi-BICs) enabled by the broken geometric symmetry offer an effective way to design high-quality photonic devices, yet challenged by tunable functionalities. Here we employ the material asymmetry originating from the tunable material property of phase-change materials to design quasi-BICs in all-dielectric compound gratings. We find the even and odd quasi-BICs are modulated by the geometric and material asymmetries, respectively, and this effect is ensured by two different types of structural symmetries in the compound structure. Particularly, tunable electromagnetically induced transparency (EIT) can be achieved by modulating the material asymmetry. Furthermore, we systematically design the compound gratings consisting of the phase-change material of Sb2Se3 to demonstrate tunable dual quasi-BICs and EITs. Analytical calculations and numerical simulations are performed to verify these findings. Our work provides a promising way to enhance the flexibility of realizing quasi-BICs, which may boost tunable applications in nanodevices assisted by quasi-BICs.
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Taheri A, Shokooh-Saremi M. Generalized homogenization method for subwavelength periodic lattices. OPTICS EXPRESS 2022; 30:42712-42727. [PMID: 36366719 DOI: 10.1364/oe.473746] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Accepted: 10/22/2022] [Indexed: 06/16/2023]
Abstract
Periodic photonic lattices based on Guided-Mode Resonance (GMR) enable the manipulation of the incident light, making them essential components in a plethora of optical elements including filters, sensors, lasers, and polarizers. The GMR is regarded as a resonance phenomenon in the resonant-subwavelength regime of periodic lattices. We present a method that homogenizes these periodic structures in the subwavelength regime and provides an appropriate analytical interpretation of the resonance effect. Here, we propose a technique based on utilizing the dispersion relation for homogenization, which can be applied to multi-part period lattices under oblique incidence. The effect of asymmetry and emergence of the odd/even modes, not considered in previous methods, will also be taken into account and discussed. As a result of this analytical procedure, resonance lines are obtained, which are useful in designing optical elements such as wideband/narrowband reflectors and polarizers.
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