Article
Materials Science, Multidisciplinary
Sergei Gladyshev, Artem Shalev, Kristina Frizyuk, Konstantin Ladutenko, Andrey Bogdano
Summary: We develop a theory of bound states in the continuum (BICs) in multipolar lattices and predict their robustness to changes in lattice parameters. We also find that some multipolar lattices can host BICs forming a continuous line and carrying zero topological charge. The developed theory establishes a fundamental relation between the topological charge of BICs and the asymptotic behavior of the Q factor in its vicinity.
Article
Physics, Multidisciplinary
Yi Chen, Ke Wang, Muamer Kadic, Sebastien Guenneau, Changguo Wang, Martin Wegener
Summary: Previous theory and experiment have shown that introducing strong nonlocal interactions in addition to local interactions into metamaterials can lead to unusual wave dispersion relations. In this study, the authors investigate the frequency-dependent acoustical phonon transmission in a slab of nonlocal metamaterial. They find a series of bound states in the continuum and sharp transmission resonances next to sharp transmission minima. The findings are validated by numerical calculations on three-dimensional metamaterial microstructures.
COMMUNICATIONS PHYSICS
(2023)
Article
Multidisciplinary Sciences
Mojtaba Karimi Habil, Carlos J. Zapata-Rodriguez, Mauro Cuevas, Samad Roshan Entezar
Summary: This research introduces an axisymmetric silicon nanoresonator with a designed tapered angle to enhance the decay rate of magnetic dipole emitters significantly. By tuning the resonator diameter and the taper angle of the blind hole, the Purcell factor and resonance frequency can be conveniently adjusted.
SCIENTIFIC REPORTS
(2021)
Article
Multidisciplinary Sciences
Sichao Qu, Yuxiao Hou, Ping Sheng
Summary: By introducing metallic ring structural dipole resonances in the micro-wave regime, a metamaterial absorber with hierarchical structures has been designed and realized to achieve high absorption rates and efficiency. The absorber shows improved performance in terms of absorption, bandwidth, and thickness.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Article
Multidisciplinary Sciences
Burak Tekcan, Brad van Kasteren, Sasan Grayli, Daozhi Shen, Man Chun Tam, Dayan Ban, Zbigniew Wasilewski, Adam W. Tsen, Michael E. Reimer
Summary: This article reports a method for designing a new type of semiconductor nanowire metamaterial and demonstrates near-unity absorption efficiency at room temperature by carefully arranging nanowire arrays and controlling their shape. This work enables the development of quantum detectors with broadband near-unity absorption in the infrared, operating near room temperature for a wider range of applications.
SCIENTIFIC REPORTS
(2022)
Article
Chemistry, Multidisciplinary
Zhendong Yan, Qi Zhu, Xue Lu, Wei Du, Xingting Pu, Taoping Hu, Lili Yu, Zhong Huang, Pinggen Cai, Chaojun Tang
Summary: The study demonstrates that introducing a monolayer graphene onto an aluminum nanoantenna enhances the absorbance of plasmonic odd modes and suppresses the absorption of even modes, resulting in a clear absorption peak with a high quality factor of 27 for the plasmonic third-order mode. This structure shows potential applications in optical refractive-index sensing with a sensitivity of 25 nm/RIU and a figure of merit of 3.
Article
Optics
Yuedan Zhou, Yifeng Liu, Wenjiao Wang, Dexu Chen, Xueming Wei, Jian Li, Yongjun Huang, Guangjun Wen
Summary: This paper introduces a new type of optomechanical metamaterial based on a planar ELC-type absorbing structure fabricated on a low-loss flexible substrate. The nonlinear coupling mechanism and nonlinear response phenomenon of this metamaterial driven by electromagnetic induced force are analyzed to reveal the coupling phenomenon of electromagnetic field and mechanical field.
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
Chemistry, Physical
Omar Ibrahim, Sunghee Lee, Sung Wook Kim, Seung Beom Pyun, Connor Woods, Eun Chul Cho, So-Jung Park, Zahra Fakhraai
Summary: Dynamic metamolecules consist of a hydrogel dielectric core surrounded by randomly packed plasmonic nanobeads, with their optical properties tunable by controlling core diameter. High-order multipole resonances become prominent as structure size increases and interbead gap decreases, leading to significant mixing among high-order magnetic multipole modes, particularly in the directional scattering spectra. Additionally, higher-order magnetic modes can exhibit Fano-like interference patterns in angular scattering, which are experimentally detectable.
JOURNAL OF PHYSICAL CHEMISTRY C
(2021)
Article
Optics
Yang Yue, Fengyan He, Lingling Chen, Fangzhou Shu, Xufeng Jing, Zhi Hong
Summary: The study demonstrates the analogue of electromagnetically induced transparency (EIT) with a high-Q factor in a metal-dielectric bilayer terahertz metamaterial via bright-bright mode coupling and bright-dark mode coupling. This novel metamaterial offers new possibilities for high-Q cavities, sensing, and slow-light based devices.
Article
Chemistry, Multidisciplinary
Roman E. Noskov, Andrey Machnev, Ivan I. Shishkin, Marina V. Novoselova, Alexey V. Gayer, Alexander A. Ezhov, Evgeny A. Shirshin, Sergei V. German, Ivan D. Rukhlenko, Simon Fleming, Boris N. Khlebtsov, Dmitry A. Gorin, Pavel Ginzburg
Summary: Mesoscopic photonic systems have great potential in biomedical devices, but biocompatibility is often a challenge. A unique biofriendly approach to delivering optical resonances through controlled infusion of gold nanoseeds into polycrystalline sub-micrometer vaterite spherulites has demonstrated the creation of a tunable optical metamaterial. The concept of golden vaterite paves the way for introducing designer-made Mie resonances in cutting-edge biophotonic applications.
ADVANCED MATERIALS
(2021)
Article
Engineering, Electrical & Electronic
Qiqi Bao, Yunmeng Liu, Bowen Gang, Wenming Yang, Qingmin Liao
Summary: In this paper, a novel shadow mask-based semantic-aware network (S(2)Net) is proposed for shadow removal. The network utilizes shadow masks to guide the shadow removal process and addresses the problems of color inconsistencies and artifacts along shadow boundaries through semantic-guided dilated residual blocks and a newly designed boundary loss. Extensive experiments demonstrate that the proposed method outperforms existing shadow removal methods on various datasets.
IEEE TRANSACTIONS ON CONSUMER ELECTRONICS
(2022)
Article
Optics
Debdatta Ray, Andrei Kiselev, Olivier J. F. Martin
Summary: This study systematically investigates the evolution of multipoles and spectra for a hybrid metal-dielectric nanoantenna as its dimensions vary. By adjusting the height of the Ag on the Si cylinder and introducing insulating spacing, magnetic light at different energy levels is demonstrated. Furthermore, variations in the radius of the Ag disk are explored to observe the anapole state and narrow spectral features.
Article
Chemistry, Physical
Kavitha Muthukrishnan, Venkateswaran Narasimhan
Summary: Terahertz metamaterial absorbers (MMA) have shown promising research prospects in the development of multiband absorbers, with applications in THz imaging, wireless communication, and bolometric detectors. By utilizing a GaAs substrate and a metallic pattern on a gold layer, this design achieved 9-band absorption in the THz spectral region. The absorption mechanism was studied using electric field dispersion analysis and impedance matching, demonstrating nine bands within a narrow frequency range and potential applications in hyperspectral imaging and clinical sensing.
Article
Materials Science, Multidisciplinary
Jun Ji, Chuming Zhao, Frank Yao, Tetsuro Oishi, John Stewart, Yun Jing
Summary: Recent developments in metamaterial research have shown promising progress in overcoming the physical limitations of acoustics. However, there has been a scarcity of acoustic metamaterials research that can have a direct impact on real-world applications. In this study, an acoustic metamaterial is incorporated into a head-mounted audio module to improve the sound pressure level in the bass range. Through numerical simulations and comprehensive measurements, the improvement of the audio module is demonstrated. This study represents an important milestone in using acoustic metamaterial research to solve challenges in the audio industry.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Materials Science, Multidisciplinary
Gaganpreet Singh, Harsh Sheokand, Saptarshi Ghosh, Kumar Vaibhav Srivastava, J. Ramkumar, S. Anantha Ramakrishna
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2019)
Article
Engineering, Electrical & Electronic
Yakeen Tayde, Mondeep Saikia, Kumar Vaibhav Srivastava, Subramanian Anantha Ramakrishna
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2018)
Article
Engineering, Electrical & Electronic
Harsh Sheokand, Gaganpreet Singh, Saptarshi Ghosh, Janakarajan Ramkumar, Subramanian Anantha Ramakrishna, Kumar Vaibhav Srivastava
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2019)
Article
Physics, Applied
Rajesh Kumar, Faraz A. Inam, Anh Ly, Carlo Bradac, S. Anantha Ramakrishna
PHYSICAL REVIEW APPLIED
(2019)
Article
Engineering, Manufacturing
Shashank Sharma, Vijay Mandal, S. A. Ramakrishna, J. Ramkumar
JOURNAL OF MANUFACTURING PROCESSES
(2019)
Article
Physics, Applied
Gaganpreet Singh, Harsh Sheokand, Kajal Chaudhary, Kumar Vaibhav Srivastava, J. Ramkumar, S. Anantha Ramakrishna
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2019)
Article
Physics, Multidisciplinary
Saleem Shaik, Anjani Kumar Tiwari, S. Anantha Ramakrishna
PRAMANA-JOURNAL OF PHYSICS
(2019)
Article
Engineering, Electrical & Electronic
Abhinav Bhardwaj, Kumar Vaibhav Srivastava, S. Anantha Ramakrishna
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2019)
Article
Engineering, Electrical & Electronic
Yakeen Tayde, Kajal Chaudhary, Gaganpreet Singh, Ayushi Dhumal, Mondeep Saikia, Kumar V. Srivastava, Janakrajan Ramkumar, Subramaniam A. Ramakrishna
MICROWAVE AND OPTICAL TECHNOLOGY LETTERS
(2020)
Article
Engineering, Electrical & Electronic
Mondeep Saikia, Kumar Vaibhav Srivastava, S. Anantha Ramakrishna
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2020)
Article
Engineering, Manufacturing
Kajal Chaudhary, Gaganpreet Singh, J. Ramkumar, S. Anantha Ramakrishna, Kumar Vaibhav Srivastava, Praveen C. Ramamurthy
IEEE TRANSACTIONS ON COMPONENTS PACKAGING AND MANUFACTURING TECHNOLOGY
(2020)
Article
Chemistry, Physical
Govind Dayal, Ikki Morichika, Satoshi Ashihara
Summary: This study achieved strong coupling between molecular vibrations and infrared photons, revealing factors influencing the coupling strength. VSC at the single nanogap patch antenna level holds promise for advancing molecular-scale chemistry and ultra-sensitive sensors.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Optics
Sarvesh K. Dubey, Awadhesh Kumar, Govind Dayal, Amit Pathak, S. K. Srivastava
Summary: This paper proposes a design of polarization-insensitive, broadband electromagnetic wave absorber in the long-wave infrared region using metamaterials. The numerical results show that the proposed design has high absorption rates over a wide range of incidence angles and polarizations, and it can completely absorb electromagnetic waves at specific wavelengths. This design has great potential for applications in energy harvesting and optoelectronics.
OPTICS AND LASER TECHNOLOGY
(2022)
Proceedings Paper
Engineering, Electrical & Electronic
Sudha Malik, Mondeep Saikia, Gaganpreet Singh, J. Ramkumar, S. Anantha Ramakrishna, Kumar Vaibhav Srivastava
2019 URSI ASIA-PACIFIC RADIO SCIENCE CONFERENCE (AP-RASC)
(2019)
Proceedings Paper
Computer Science, Hardware & Architecture
Harsh Sheokand, Gaganpreet Singh, Saptarshi Ghosh, Mondeep Saikia, Kumar Vaibhav Srivastava, J. Ramkumar, S. Anantha Ramakrishna
2018 TWENTY FOURTH NATIONAL CONFERENCE ON COMMUNICATIONS (NCC)
(2018)
