Article
Chemistry, Multidisciplinary
Janna Eaves-Rathert, Elena Kovalik, Chibuzor Fabian Ugwu, Bridget R. Rogers, Cary L. Pint, Jason G. Valentine
Summary: The electro-chemical lithiation of anatase TiO2 to Li0.5TiO2 (LTO) enables dynamic visible color tuning with reduced absorption at high frequencies. The dynamic tunability of TiO2 can be leveraged in a Fabry-Perot cavity and a gap plasmon metasurface, showing competitive performance with established actuators like WO3.
Article
Engineering, Electrical & Electronic
Yunping Bai, Shanguo Huang, Zhonghan Su, Zhennan Zheng, Xiyao Song, Xinlu Gao
Summary: The paper introduces a novel OSSB modulation with tunable OCSR system, which effectively cancels out the optical carrier and first-order sidebands in the secondary channel and achieves a significantly increased SFDR by optimizing the output microwave signal power.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Chemistry, Physical
Haiyun Yao, Xin Yan, Maosheng Yang, Qili Yang, Yunyun Liu, Aiyun Li, Meng Wang, Dequan Wei, Zhongjun Tian, Lanju Liang
Summary: The study presents three different types of terahertz modulators, utilizing graphene and metal-microstructure-integrated metamaterials, bare graphene films, and graphene-based all-dielectric metamaterials for design and characterization. Ultra-sensitive dynamic THz modulation is achieved by shifting the quasi-Fermi level of graphene, reaching a modulation depth of up to 346% and revealing a trend of modulation depth variation in the 0.2-2 THz range.
Article
Nanoscience & Nanotechnology
Jacob B. Khurgin
Summary: Optical isolators are important components in optical networks. Magneto-optic isolators have low power consumption but are not suitable for on-chip integration. Temporal modulation of the dielectric constant offers an alternative method, but has its own drawbacks. This research examines various methods of optical isolation using temporal modulation and finds that regardless of the method used, there are constraints on footprint, modulation frequency, and power consumption to achieve full isolation without excessive insertion loss. The estimated power consumption with current and near-future materials is at least 100 mW, and the acceptability of this requirement depends on the progress of magneto-optic and time-modulated integrated technologies.
Article
Optics
Wenli Huang, Xiaoqing Luo, Fangrong Hu, Guangyuan Li
Summary: This article proposes a double-layered graphene-metal metamaterial for achieving a transmissive terahertz phase modulator with a large dynamic phase modulation range and high transmittance. By adjusting the graphene Fermi level, large transmission phase shift and relatively high transmittance can be achieved simultaneously.
Article
Materials Science, Multidisciplinary
Peng Zhang, Bo Fang, Tianqi Zhao, Lan Ke, Xiaoli Ma, Chenxia Li, Zhi Hong, Xufeng Jing
Summary: We propose an ultra-thin I-type metasurface that can independently control the amplitude and phase of transmitted waves by changing the geometry and direction of rotation of I-shaped metal particles. The amplitude and phase of the incident wave can be controlled independently by the direction of rotation and the size of the geometrical opening of the I-shaped copper particle. We have experimentally prepared array structure samples and compared the results with theoretical calculations, with good agreement. We further propose a two-layer structure to simultaneously regulate the amplitude and phase of terahertz waves, and experimental results are also in good agreement with theoretical calculations.
RESULTS IN PHYSICS
(2023)
Article
Optics
Hao Sun, Jie Yang, Hengzhu Liu, Dan Wu, Xin Zheng
Summary: The study presents an ultrafast process-selectable modulation of plasmon-induced transparency (PIT) effect by incorporating silicon islands into metamaterials, achieving giant modulation depths as high as 129% and 109%. Along with the significant switching of the transparent window, remarkable slow light effect occurs.
CHINESE OPTICS LETTERS
(2021)
Article
Physics, Multidisciplinary
Yevhenii M. Morozov, Anatoliy S. Lapchuk, Iryna S. Protsak, Andriy A. Kryuchyn, Ivan P. Nevirkovets
Summary: We report a novel temperature-dependent modulation effect in graphene-supported metamaterials. The effect was observed during the theoretical analysis of an electro-optical modulator with graphene supported by a buffer dielectric layer of silicon dioxide (SiO2) or hafnium dioxide (HfO2). Comparative analysis showed that both materials provide similar maximum values for transmission and reflection modulation depths, but a lower chemical potential of graphene is required in the case of a HfO2 buffer layer. The study also revealed that the graphene layer exhibits high absorption for certain chemical potential values, which is highly temperature dependent. The discovered modulation effect significantly increases the transmission and reflection modulation depths in a simple model structure.
NEW JOURNAL OF PHYSICS
(2022)
Article
Multidisciplinary Sciences
Chao Qian, Zhedong Wang, Haoliang Qian, Tong Cai, Bin Zheng, Xiao Lin, Yichen Shen, Ido Kaminer, Erping Li, Hongsheng Chen
Summary: This paper introduces the concept of neuro-metamaterials, which enable a dynamic entirely-optical object recognition and mirage. The experiments demonstrate that this technology can perceive the postures of rabbits at the speed of light and create dynamic optical mirages using holographic videos.
NATURE COMMUNICATIONS
(2022)
Article
Chemistry, Physical
Jin Zhang, Zhenfei Li, Linda Shao, Fajun Xiao, Weiren Zhu
Summary: The study demonstrates the active modulation of EIT analog by integrating graphene into a microwave metamaterial for the first time, showing that the EIT peak can be dynamically controlled under a relatively low bias voltage applied on graphene. The continuous tuning of the EIT resonance strength is achieved by variably dampening the dark resonator using graphene.
Article
Chemistry, Multidisciplinary
Angelica Niazov-Elkan, Margarita Shepelenko, Lotem Alus, Miri Kazes, Lothar Houben, Katya Rechav, Gregory Leitus, Anna Kossoy, Yishay Feldman, Leeor Kronik, Peter G. Vekilov, Dan Oron
Summary: A facile procedure is presented to deposit bio-inspired birefringent crystals of xanthine derivatives on a template of single-crystal quartz. The crystal sheets obtained have well-defined orientation and high optical anisotropy, and can be used to fabricate polarization-dependent optical devices.
ADVANCED MATERIALS
(2023)
Article
Multidisciplinary Sciences
Zhiling Zhou, Sibo Huang, Dongting Li, Jie Zhu, Yong Li
Summary: Utilizing nonlocality between subunits, ultrathin acoustic metamaterials achieve broadband sound absorption and desired impedance profiles. The over-damped recipe and the reduced excessive response recipe are employed for impedance matching and broadband near-perfect absorption.
NATIONAL SCIENCE REVIEW
(2022)
Article
Nanoscience & Nanotechnology
Hee-Dong Jeong, Jongsu Lee, Eui-Sang Yu, Taehyun Kim, In Soo Kim, Sin-Doo Lee, Yong-Sang Ryu, Seung-Yeol Lee
Summary: A simple nanoscale Fabry-Perot film is proposed in this paper, providing full-color coverage in the visible region with high color tunability through engineering the geometries of the constituent layers. Precisely tailored thicknesses and filling-fractions of each layer allow for fine color tuning, and a standard guideline of structural colors depending on physical variables is established. The physicochemical property-dependent coloration is demonstrated via the nanometer-thick Fabry-Perot stack, further applied to functional mimicry of environmental sensitive optical camouflage.
ACS APPLIED NANO MATERIALS
(2021)
Article
Mechanics
Payal Banerjee, Srajan Dalela, P. S. Balaji, S. Murugan, L. A. Kumaraswamidhas
Summary: This study proposes a dual function metastructure based on quasi-zero-stiffness (QZS) for simultaneous vibration isolation and energy harvesting. By adjusting the mechanical properties and electrical parameters, the vibration isolation region and maximum power range can be modified.
Article
Nanoscience & Nanotechnology
Guiming Han, Min Zhong
Summary: A novel doubly modulated metamaterial absorber is proposed in this study, which demonstrates the modulation of resonant properties of absorption peaks by adjusting the Fermi energy of graphene film. Under specific conductivity conditions of VO2 particles, four new absorption peaks are also discovered, revealing a transition from single-band to multi-band metamaterial.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2021)
