Article
Engineering, Electrical & Electronic
Jiacheng Xie, Mohan Shen, Yuntao Xu, Wei Fu, Likai Yang, Hong X. Tang
Summary: Researchers have discovered that incorporating a millimetre-wave dual-rail resonator into a suspended lithium niobate resonator can achieve efficient electromechanical transduction in the sub-terahertz regime. These electromechanical resonators operating in the sub-terahertz regime could be of great importance in future communication systems due to their ability to support extremely fast data rates. These resonators also have significant implications in the study of quantum phenomena in mechanical entities.
NATURE ELECTRONICS
(2023)
Article
Optics
Wei Wang, Fengping Yan, Zhi Wang, Haisu Li, Guifang Wu, Siyu Tan, Xuemei Du, Ting Li, Xiangdong Wang, Hao Guo, Ting Feng
Summary: We present a simple design of a metamaterial absorber (MA) based on a two-dimensional trenched metal meta-grating, which exhibits a single ultra-narrow absorption resonance within a clean background spectrum ranging from 0 to 2 THz. The absorption resonance features a linewidth of 0.4 GHz and a Q factor of 2407, thanks to interference effect and the introduction of an air trench. The MA sensor shows excellent sensing performance with high saturated thickness, maximum sensitivity, and maximum sensing figure of merit.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Physics, Applied
Xue Li, Hengyuan Jiao, Mingqiang Zhu, Tao Deng, Jingye Sun
Summary: In this paper, a novel microfluidic channel embedded terahertz metamaterial sensor is proposed for the detection of small volume liquid samples. The sensor combines microfluidic superstrate with substrate, allowing for easy fabrication and sensitive detection of liquid-based samples.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Zhonghang Wu, Huizhu Li, Sijia Feng, Huaixuan Sheng, Luyi Sun, Hui Wang, Dejun Liu, Jun Chen
Summary: Double-layer metal structures with certain distance between them show strong fields coupling. In this study, the terahertz transmission properties of a composite slab composed of double-layer metal complementary periodic cross-shaped resonators (CPCRs) were investigated. By adjusting the spacing between two metal layers and introducing a dielectric layer, multi-band filters and manipulation of transmission properties were achieved. The composite slab has the potential for high sensitivity molecular fingerprint detection and narrow bandwidth filters in terahertz regions.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Optics
Tae-Han Kim, Seontae Kim, Young Pyo Jeon, Ji Hun Ahn, Bo Wha Lee, Gun-Sik Park, Jaehun Park, Young Ju Kim, Sang Yoon Park, Young Joon Yoo
Summary: This paper presents a broadband transmission filter based on guided mode resonances in a terahertz metasurface. The filter is composed of metallic gold disks and a quartz slab, with two identical metasurfaces placed on the upper and lower sides of the slab. It can excite both even and odd guided mode resonances, and the interaction of these resonances at similar frequencies results in a broadband transmission peak. The sharp spectral features of each resonance lead to a sudden degradation of transmission at the spectral edge, enabling filter applications.
Article
Optics
Zhaojian Zhang, Junbo Yang, Te Du, Hansi Ma, Xinpeng Jiang
Summary: In this work, polarization-insensitive dual bound states in the continuum (BICs) at the Gamma point in symmetric photonic crystal slabs are investigated. The BICs are tailored by adjusting the optical coupling strengths of the slabs. The transition from BIC to quasi-BIC resonances is realized using four different approaches while maintaining the slabs' symmetry. The resonances are found to be lowest-order eigenmodes that match the symmetry of incident plane waves, and their quality factors follow a specific law. Additionally, the dominant modes of the BICs are identified using multipolar decomposition. Anisotropic coupling adjustment is discussed, providing more control over the BICs. The work introduces a new perspective for manipulating BICs in PhC slabs and has potential applications in nonlinear enhancement and sensing.
Article
Optics
Haocheng Sun, Shuai Yuan, Chen Feng, Jing Zhang, Cheng Zeng, Jinsong Xia
Summary: Bound states in the continuum (BICs) are resonances perfectly confined within the radiation continuum, and have been extensively studied in various wave systems. This study experimentally demonstrates the combination of Fabry-Perot and symmetry-protected BICs at near infrared wavelengths, resulting in enhanced resonance localization.
Article
Optics
Yan Zhi, Weici Liu, Xiangbo Yang, Zhongchao Wei, Shiping DU, Hongyun Meng, Hongzhan Liu, Jianping Guo, Manxing Yang, Jianan Wang, Liujing Xiang, Zhenming Huang, Haoxian LI, Faqiang Wang
Summary: In this study, a one-dimensional two-material period ring optical waveguide network (TMPROWN) was designed and its optical properties were investigated. Key characteristics observed in the 1D TMPROWN include the generation of bound states in continuum (BICs) and their larger and continuous range compared to previous optical structures. The physical mechanisms of the generated BICs in the 1D TMPROWN were analyzed. The simplicity of its structure, flexibility in adjusting frequency band of BICs, and ease of measuring electromagnetic wave properties make the 1D TMPROWN promising for various optical applications.
Article
Physics, Applied
Baoku Wang, Jing Liu, Jialin Liu, Jianlong Liu, Jianqiang Liu, Weimin Sun, Li Li
Summary: We propose a graphene-metal metasurface for enhancing terahertz third-harmonic generation through the generation of bound states in the continuum (BICs). By adjusting the graphene Fermi level, the parameter-tuned BICs can transition to distinct quasi-BICs, allowing for strong confinement of the localized field in monolayer graphene. By exploiting the large third-order nonlinearity of graphene, efficient third-harmonic generation can be achieved under low pump threshold at the quasi-BICs. At a fundamental THz incidence of 50 kW/cm(2), a THG conversion efficiency of approximately 3% can be achieved at the quasi-BICs regime. This makes BIC metasurfaces highly attractive for THz nonlinear photonics.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Optics
Harry Miyosi Silalahi, Yin-Pei Chen, Yi-Hong Shih, Yu-Shao Chen, Xin-Yu Lin, Jih-Hsin Liu, Chia-Yi Huang
Summary: A simple method is proposed to increase the refractive index sensitivities of terahertz metamaterials, enabling them to detect low-concentration proteins and potentially dangerous viruses. The floating terahertz metamaterial provides an extremely large refractive index sensitivity of 532 GHz/RIU and is a significant achievement in the development of protein sensors.
PHOTONICS RESEARCH
(2021)
Article
Multidisciplinary Sciences
Ziheng Yao, Xinzhong Chen, Lukas Wehmeier, Suheng Xu, Yinming Shao, Zimeng Zeng, Fanwei Liu, Alexander S. Mcleod, Stephanie N. Gilbert Corder, Makoto Tsuneto, Wu Shi, Zihang Wang, Wenjun Zheng, Hans A. Bechtel, G. L. Carr, Michael C. Martin, Alex Zettl, D. N. Basov, Xi Chen, Lukas M. Eng, Susanne C. Kehr, Mengkun Liu
Summary: s-SNOM is a powerful tool commonly used for infrared nano-spectroscopy, but it lacks sensitivity to in-plane sample anisotropy. Authors introduce a method involving a metallic microdisk antenna to improve sensitivity by probing in-plane phonon responses.
NATURE COMMUNICATIONS
(2021)
Article
Engineering, Electrical & Electronic
Danka B. Stojanovic, Goran Gligoric, Petra P. Belicev, Milivoj R. Belic, Ljupco Hadzievski
Summary: This article proposes a chiral metamaterial absorber operating in the terahertz frequency range, which achieves significant absorption of left circularly polarized light by adjusting the period size of the structure. The chiral structure shows huge circular dichroism and near-unity polarization selective absorption, making it a promising candidate for designing circular polarization selective absorbers.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Materials Science, Multidisciplinary
Maria Cojocari, Anar K. Ospanova, Vladimir Chichkov, Miguel Navarro-Cia, Andrei Gorodetsky, Alexey A. Basharin
Summary: This study presents a numerical, theoretical, and experimental investigation of a terahertz metasurface supporting a pseudo-anapole, revealing the characteristics of the pseudo-anapole effect and its resonance suppression of multipole radiation. It also proposes a method to control the metasurface response by manipulating the electric and toroidal responses independently.
Article
Optics
Davide D'Ambrosio, Xavier Zambrana-Puyalto, Marialuisa Capezzuto, Antonio Giorgini, Pietro Malara, Saverio Avino, Gianluca Gagliardi
Summary: This study investigates the resonance spectrum and scattered light field of whispering-gallery modes (WGMs) in a liquid droplet excited with a free-space visible laser beam based on the generalized Lorenz-Mie theory. By imaging the scattering patterns, a strong agreement between theory and experiment is shown. The research provides insights into the free-space optical coupling phenomenon and offers pathways for controlled excitation of ultrahigh-quality WGMs in a variety of optical microresonators for sensing and imaging applications.
Article
Optics
Ningning Yang, Tingting Lang, Wenyang Cen, Zhenyu Yu, Meiyu Xiao, Jinhui Zhang, Yanqing Qiu
Summary: The concept of bound states in the continuum (BICs) in optics has gained significant attention recently, offering a mechanism for high-quality-factor optical resonance generation. This paper presents two metasurfaces with the same structure but different materials, exhibiting consistent resonant frequencies within a small error range of 2.5 GHz. Quasi-BIC resonance is achieved by breaking the symmetry. The electric field distribution, sensitivity, and figure of merit (FOM) are analyzed, resulting in sensitivities of 79.3 GHz/RIU and 72.4 GHz/RIU, and the highest FOMs of 424.8 and 180.5, respectively. This study further highlights the advantages of all-silicon metasurfaces.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
