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Wang L, Dong Q, Zhou T, Zhao H, Wang L, Gao L. Multi-mode resonance of bound states in the continuum in dielectric metasurfaces. OPTICS EXPRESS 2024; 32:14276-14288. [PMID: 38859378 DOI: 10.1364/oe.514704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Accepted: 03/20/2024] [Indexed: 06/12/2024]
Abstract
Bound states in the continuum (BIC) represent distinct non-radiative states endowed with infinite lifetime and vanishing resonance linewidth. Introducing asymmetric perturbation to the system can convert true BICs into high quality leaky modes which is useful in many photonic applications. Previously, such perturbation and resonance of interest is only limited to a single factor. However, different perturbations by unit cell gap, geometry and rotation angle result distinctive resonance modes. The combination of two perturbation factors can excite multi-mode resonance contributed from each asymmetric factor which coexist simultaneously; thus, the number of reflectance peaks can be controlled. In addition, we have carefully analyzed the electric field variations under different perturbation factors, followed by a multipolar decomposition of resonances to reveal underlying mechanisms of distinct resonance modes. Through simulations, we find that the introduction of multiple asymmetric perturbations also influences the metasurface sensitivity in refractive index sensing and compare the performance of different resonance modes. These observations provide structural design insights for achieving high quality resonance with multiple modes and ultra-sensitive sensing.
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Li J, Wu Z, Zhang D, Sun Y, Liu W, Yu T. Nonreciprocal toroidal dipole resonance and one-way quasi-bound state in the continuum. OPTICS LETTERS 2024; 49:1313-1316. [PMID: 38427001 DOI: 10.1364/ol.516427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Accepted: 02/06/2024] [Indexed: 03/02/2024]
Abstract
Bound states in the continuum (BICs) provide an alternative way of trapping light at nanoscale. Although the last 10 years have witnessed tremendous progress on BICs from fundamentals to applications, nonreciprocal BICs and their potential applications have not been fully exploited yet. In this study, we demonstrated a one-way quasi-BIC by leveraging an all-dielectric magneto-optical (MO) metasurface. We show that the key point for achieving a one-way quasi-BIC is to excite a magnetization-induced leaky resonance. Here we adopt the longitudinal toroidal dipole (TD) resonance characterized by a vortex distribution of head-to-tail magnetic dipoles parallel to the plane of the MO metasurface. We show that, by breaking the time-reversal symmetry, at critical conditions, the TD resonance can be enhanced in the forward channel and perfectly canceled in the time-reversed channel, resulting in a one-way quasi-BIC. The demonstrated phenomena hold significant promise for practical applications such as magnetic field optical sensing, nonreciprocal optical switching, isolation, and modulation.
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Elshorbagy MH, Cuadrado A, Alda J. Optical Sensing Using Hybrid Multilayer Grating Metasurfaces with Customized Spectral Response. SENSORS (BASEL, SWITZERLAND) 2024; 24:1043. [PMID: 38339760 PMCID: PMC10857231 DOI: 10.3390/s24031043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2024] [Revised: 01/30/2024] [Accepted: 02/01/2024] [Indexed: 02/12/2024]
Abstract
Customized metasurfaces allow for controlling optical responses in photonic and optoelectronic devices over a broad band. For sensing applications, the spectral response of an optical device can be narrowed to a few nanometers, which enhances its capabilities to detect environmental changes that shift the spectral transmission or reflection. These nanophotonic elements are key for the new generation of plasmonic optical sensors with custom responses and custom modes of operation. In our design, the metallic top electrode of a hydrogenated amorphous silicon thin-film solar cell is combined with a metasurface fabricated as a hybrid dielectric multilayer grating. This arrangement generates a plasmonic resonance on top of the active layer of the cell, which enhances the optoelectronic response of the system over a very narrow spectral band. Then, the solar cell becomes a sensor with a response that is highly dependent on the optical properties of the medium on top of it. The maximum sensitivity and figure of merit (FOM) are SB = 36,707 (mA/W)/RIU and ≈167 RIU-1, respectively, for the 560 nm wavelength using TE polarization. The optical response and the high sensing performance of this device make it suitable for detecting very tiny changes in gas media. This is of great importance for monitoring air quality and thecomposition of gases in closed atmospheres.
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Affiliation(s)
- Mahmoud H. Elshorbagy
- Physics Department, Faculty of Science, Minia University, El-Minya 61519, Egypt
- Grupo Complutense de Optica Aplicada, Departamento de Optica, Facultad de Óptica y Optometría, Universidad Complutense de Madrid, Av. Arcos de Jalón, 118, 28037 Madrid, Spain;
| | - Alexander Cuadrado
- Escuela de Ciencias Experimentales y Tecnología, Universidad Rey Juan Carlos, 28933 Móstoles, Spain;
| | - Javier Alda
- Grupo Complutense de Optica Aplicada, Departamento de Optica, Facultad de Óptica y Optometría, Universidad Complutense de Madrid, Av. Arcos de Jalón, 118, 28037 Madrid, Spain;
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Men K, Lian Z, Tu H, Zhao H, Wei Q, Jin Q, Mao C, Wei F. An All-Dielectric Metamaterial Terahertz Biosensor for Cytokine Detection. MICROMACHINES 2023; 15:53. [PMID: 38258172 PMCID: PMC10819069 DOI: 10.3390/mi15010053] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2023] [Revised: 12/20/2023] [Accepted: 12/22/2023] [Indexed: 01/24/2024]
Abstract
In this paper, we report an all-dielectric metamaterial terahertz biosensor, which exhibits a high Q factor of 35 at an 0.82 resonance peak. A structure with an electromagnetically induced transparency effect was designed and fabricated to perform a Mie resonance for the terahertz response. The biosensor exhibits a limit of detection of 100 pg/mL for cytokine interleukin 2 (IL-2) and a linear response for the logarithm of the concentration of IL-2 in the range of 100 pg/mL to 1 μg/mL. This study implicates an important potential for the detection of cytokines in serum and has potential application in the clinical detection of cytokine release syndrome.
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Affiliation(s)
- Kuo Men
- State Key Laboratory of Advanced Materials for Smart Sensing, GRINM Group Co., Ltd., Beijing 100088, China; (K.M.); (Q.J.); (C.M.)
- GRIMAT Engineering Institute Co., Ltd., Beijing 101402, China
- GRINM (Guangdong) Institute for Advanced Materials and Technology, Foshan 528051, China
- General Research Institute for Nonferrous Metals, Beijing 100088, China
| | - Ziwei Lian
- State Key Laboratory of Advanced Materials for Smart Sensing, GRINM Group Co., Ltd., Beijing 100088, China; (K.M.); (Q.J.); (C.M.)
- GRIMAT Engineering Institute Co., Ltd., Beijing 101402, China
- GRINM (Guangdong) Institute for Advanced Materials and Technology, Foshan 528051, China
- General Research Institute for Nonferrous Metals, Beijing 100088, China
| | - Hailing Tu
- State Key Laboratory of Advanced Materials for Smart Sensing, GRINM Group Co., Ltd., Beijing 100088, China; (K.M.); (Q.J.); (C.M.)
| | - Hongbin Zhao
- State Key Laboratory of Advanced Materials for Smart Sensing, GRINM Group Co., Ltd., Beijing 100088, China; (K.M.); (Q.J.); (C.M.)
| | - Qianhui Wei
- State Key Laboratory of Advanced Materials for Smart Sensing, GRINM Group Co., Ltd., Beijing 100088, China; (K.M.); (Q.J.); (C.M.)
- GRIMAT Engineering Institute Co., Ltd., Beijing 101402, China
- GRINM (Guangdong) Institute for Advanced Materials and Technology, Foshan 528051, China
| | - Qingxi Jin
- State Key Laboratory of Advanced Materials for Smart Sensing, GRINM Group Co., Ltd., Beijing 100088, China; (K.M.); (Q.J.); (C.M.)
- GRIMAT Engineering Institute Co., Ltd., Beijing 101402, China
- General Research Institute for Nonferrous Metals, Beijing 100088, China
| | - Changhui Mao
- State Key Laboratory of Advanced Materials for Smart Sensing, GRINM Group Co., Ltd., Beijing 100088, China; (K.M.); (Q.J.); (C.M.)
| | - Feng Wei
- State Key Laboratory of Advanced Materials for Smart Sensing, GRINM Group Co., Ltd., Beijing 100088, China; (K.M.); (Q.J.); (C.M.)
- GRINM (Guangdong) Institute for Advanced Materials and Technology, Foshan 528051, China
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