Article
Materials Science, Multidisciplinary
Feng Lan, Zi-Fan Meng, Jiu-Fu Ruan, Rui-Zhi Zou, Sheng-Wei Ji
Summary: The study introduces an all-dielectric metamaterial absorber with excellent absorption performance, thermal stability, and insensitivity to polarization and incident angle, which shows promising applications in the terahertz domain.
Article
Chemistry, Physical
Xiaodi Weng, Jie Wang, Changming Xu, Yongqing Wang, Yining Liao, Xuejin Wang
Summary: In this study, a simple design of a dual-band terahertz metasurface perfect absorber (MPA) was proposed using a complementary-star-shaped (CSS) structure all-dielectric GaAs array. Simulation results showed that the MPA achieved over 99.9% absorbance at 0.715 THz and 0.861 THz, respectively, and high Q-factors of about 79.58 and 78.27. The perfect absorption was mainly due to the excitations of surface plasmonic polaritons (SPPs) modes. The absorption properties of the MPA could be adjusted by varying the geometric parameters of the unit-cell structure. The designed dual-band MPA has great potential in various terahertz applications such as sensing, detecting, thermal emitting, and imaging.
Article
Materials Science, Multidisciplinary
Yongzhi Cheng, Zhiren Li, Zhengze Cheng
Summary: In this paper, a terahertz perfect absorber made of all-dielectric metasurface with periodic sub-wavelength InSb micro-rod array is proposed for temperature and refractive index sensing application. The absorbance of 99.9% at 1.757 THz with a Q-factor of about 53.24 under room temperature is achieved, and the resonance absorption properties can be adjusted by changing the geometric parameters of the structure. The proposed PA shows potential applications in sensors, detectors, filters, and other optoelectronic devices in the THz region.
Article
Optics
Baoku Wang, Ke Gai, Ruoxing Wang, Fei Yan, Li Li
Summary: This paper presents an interesting scheme of an ultra-broadband perfect terahertz (THz) absorber using a periodic-conductivity graphene metasurface. By modulating the conductivity of graphene in a periodic manner, the absorber can generate dense high-order resonance modes and achieve ultra-broadband continuous absorption. This scheme is significant for the development of broadband THz absorbers and has promising application prospects in THz stealth, imaging, and communication fields.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Qiangguo Zhou, Wanli Ma, Tuntan Wu, Yongzhen Li, Qinxi Qiu, Jiaxin Duan, Jingbo Li, Lin Jiang, Wei Zhou, Yanqing Gao, Jingguo Huang, Zhiming Huang
Summary: In this paper, a metasurface terahertz perfect absorber with multi-frequency selectivity and good incident angle compatibility is designed and analyzed. The absorber exhibits five selective absorption peaks at different frequencies, and the effect of polarized electromagnetic wave modes and the size of the open rings on device performance is investigated. The designed metasurface absorber also shows excellent tunable modulation by adjusting two-dimensional materials and photosensitive semiconductor materials embedded in the unit structure. The results of this work have important implications for applications such as resonators, biodetection, beam-controlled antennas, hyperspectral thermal imaging systems, and sensors.
Article
Materials Science, Multidisciplinary
Jun Zhu, Changsong Wu, Yihong Ren
Summary: The study proposed a metamaterial absorber composed of graphene, and demonstrated that dynamic tuning of the absorption range and absorption bandwidth could be achieved by adjusting the Fermi level of the graphene. This has theoretical and engineering significance in the domains of thermal photo-voltaics, solar cells, and sensors.
RESULTS IN PHYSICS
(2021)
Article
Chemistry, Physical
Zhiren Li, Yongzhi Cheng, Hui Luo, Fu Chen, Xiangcheng Li
Summary: A dual-band terahertz perfect absorber based on all-dielectric metamaterial has been proposed, which achieves high absorptance and wide-angle absorption, and shows potential applications in temperature and refractive index sensing.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Engineering, Multidisciplinary
Jun Zhu, Changsong Wu
Summary: Most amino acid detection techniques currently have limitations in equipment operation procedures, detection periods, and accuracy, which do not meet the requirement of high-standard amino acid identification in the food industry. This study proposes a novel detection and identification method based on the different refractive indices of aqueous amino acid solutions. Experimental results show that this method can accurately identify amino acids, providing an important reference for further development of metamaterial sensors.
Article
Chemistry, Multidisciplinary
Qi Wu, Wenhui Fan, Chong Qin
Summary: Terahertz orbital angular momentum (OAM) technology has promising applications in future wireless communication. However, the conventional THz vortex beam is limited in co-propagation of multiple OAM modes. In this study, we demonstrate two perfect vortex beam (PVB) generators based on all-dielectric metasurfaces for polarization-independent PVB and spin multiplexed PVB, respectively. Moreover, we propose a method to generate stable perfect Poincare beams with arbitrary polarization and phase distribution on a hybrid-order Poincare Sphere using spin-decoupled metasurfaces. This research provides a compact and efficient platform for PVB generation and superposition in the THz region.
Article
Multidisciplinary Sciences
Jingcheng Zhao, Yongzhi Cheng
Summary: This paper proposes and theoretically investigates a temperature-tunable terahertz perfect absorber for temperature sensing. The absorber, composed of deep subwavelength micro-cross-shaped structures of strontium titanate resonator, achieves a high absorbance of 99.8% at 0.221 THz under room temperature. The absorption is attributed to the Mie resonance of the all-dielectric structures and the absorber is polarization-insensitive with wide-angle absorption for both transverse magnetic and transverse electric waves.
ADVANCED THEORY AND SIMULATIONS
(2022)
Article
Optics
Yulian Li, Wei Gao, Li Guo, Zihao Chen, Changjian Li, Haiming Zhang, Jiajia Jiao, Bowen An
Summary: A dynamically tunable ultra-broadband terahertz perfect metamaterial absorber based on vanadium oxide (VO2) has been proposed, with absorption bandwidth greater than 90% from 3.03 to 8.13 THz. By changing the conductivity of VO2, the absorption intensity can be dynamically tuned from 1.47% to 100%, showing significantly improved bandwidth and flexibility compared to previous reports.
Article
Chemistry, Multidisciplinary
Miao Cao, Xiaojun Huang, Lina Gao, Xiaoyan Li, Linyan Guo, Helin Yang
Summary: A transparent all-dielectric water-based broadband metamaterial absorber with excellent performance and stability has been designed, which can be widely used in stealth window weapons and electromagnetic compatibility equipment.
Article
Engineering, Electrical & Electronic
Bahareh Khodadadi, Pejman Rezaei, Vahid Ghods, Majid Babaeinik
Summary: This article proposes and examines a polarization-insensitive broadband adjustable THz metamaterial absorber. The absorber is made up of a periodic array of patterned graphene elements, providing a wide bandwidth and high absorption rate. It exhibits polarization-independent characteristics and is suitable for various applications.
OPTICAL AND QUANTUM ELECTRONICS
(2022)
Article
Materials Science, Multidisciplinary
Lewis K. Piper, H. Johnson Singh, Jonathan R. C. Woods, Kai Sun, Otto L. Muskens, Vasilis Apostolopoulos
Summary: This study demonstrates a mechanically tunable metasurface perfect absorber that allows precise control over perfect absorption conditions by adjusting the length of the microcavity, achieving significant extinction in the terahertz range.
ADVANCED PHOTONICS RESEARCH
(2021)
Article
Nanoscience & Nanotechnology
Yongzhi Cheng, Yingjie Qian, Hui Luo, Fu Chen, Zhengze Cheng
Summary: In this paper, a narrowband perfect metasurface absorber (MSA) based on a micro-ring-shaped GaAs array was proposed and theoretically investigated in the terahertz (THz) region for enhanced refractive index (RI) sensing. Simulation results showed that the proposed perfect MSA achieved an absorbance of 99.9% at 2.213 THz with a Q-factor of approximately 460.08, which was efficiently confirmed by the coupling mode theory (CMT). The perfect absorption of the designed structure was primarily contributed by the guided mode of critical resonance coupling. The absorption properties of the proposed structure could be adjusted by changing the geometrical parameters of the GaAs structure. The proposed MSA, due to its higher Q-factor, can enhance RI sensing applications with a sensitivity of about 1.45 THz/RIU. This research provides a new approach for constructing highly efficient MSAs with potential applications in sensing, detecting, and imaging in the THz region.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2023)
Article
Physics, Applied
Md Mamunur Rashid, Andreas E. Olk, Haroldo T. Hattori, David A. Powell
Summary: The study introduces a deeply subwavelength metamaterial unit cell based on the coupling of dipole and quadrupole resonances, achieving complete phase coverage and high reflection magnitude. Numerical simulations show high efficiency anomalous reflection at 45 degrees angle and a structure with a lower reflection angle of 25 degrees. The design can be used in various applications such as beam forming and scanning antennas, reflectarray antennas, phase shifters, and beam splitters.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Optics
Kebin Fan, Ilya Shadrivov, Andrey E. Miroshnichenko, Willie J. Padilla
Summary: The article discusses the necessary polarizability requirements to achieve Kerker conditions in all-dielectric metasurfaces, demonstrating invisibility and perfect absorption phenomena, and provides a method for studying exotic electromagnetic phenomena through switching between states by modifying resonator height.
Article
Optics
Anastasia Zalogina, Roman Savelev, Dmitry Zuev, Ilya Shadrivov
Summary: Nanostructures made of high-refractive-index materials provide a novel technological platform for efficient light manipulation at the nanoscale. Si and GaP are the most suitable materials for the visible spectral range. By comparing the performance of the two materials in different parts of the visible spectrum, it is found that choosing the appropriate material is beneficial for emitters at different wavelengths.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Engineering, Electrical & Electronic
Andreas E. Olk, Mingkai Liu, David A. Powell
Summary: In this article, tapered leaky-wave antennas operating at 80 GHz are designed, fabricated, and experimentally characterized. The use of only three square patches per period for coarse discretization of surface impedance allows for a wide range of surface reactance while maintaining a feasible feature size. The approach also enables precise engineering of the aperture illumination and effective suppression of sidelobes and spurious radiation.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Engineering, Electrical & Electronic
Ashif A. Fathnan, Toufiq M. Hossain, Dadin Mahmudin, Yusuf Nur Wijayanto, David A. Powell
Summary: This study reports the characterization of an achromatic focusing metasurface at oblique incident angles. It is found that in addition to off-axis aberrations caused by the hyperbolic phase profile, the focusing performance is significantly degraded due to angular dispersion of the meta-atoms. Point dipole models are used to investigate the relationship between the angular and spectral bandwidth of meta-atoms and the metasurface focusing performance. It is confirmed that the angular dispersion is the dominant mechanism in determining off-axis aberrations.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Nanoscience & Nanotechnology
Yana Izdebskaya, Ziwei Yang, Mingkai Liu, Duk-Yong Choi, Andrei Komar, Dragomir N. Neshev, Ilya Shadrivov
Summary: Dielectric metasurfaces infiltrated with liquid crystals can be tuned by magnetic field, offering advantages over other liquid crystal tuning methods. This approach allows for gradual tuning of resonances without the need for pre-alignment or structured electrodes.
Article
Optics
Luyao Wang, Ilya Shadrivov
Summary: This study numerically investigates metasurfaces incorporating electro-optic materials and demonstrates their ability to achieve large amplitude and phase modulations over a fraction of the operation wavelength. The study shows that metasurfaces composed of dielectric discs on a lithium niobate film exhibit three types of resonances, namely, Fabry-Perot modes, guided modes, and Mie modes. By comparing the performance of metasurfaces in different regimes, the study finds that the strongest amplitude modulation can be achieved by exciting and re-emitting the guided modes in the substrate. Furthermore, the study reveals that for larger phase modulation while maintaining high transmission, more complex metasurfaces with at least two resonators per unit cell are required.
Article
Physics, Multidisciplinary
Shahrokh Sepehrirahnama, Sebastian Oberst, Yan Kei Chiang, David A. Powell
Summary: Acoustic meta-atoms used as building blocks of metamaterials can control nonlinear acoustic effects of radiation force and torque, potentially enabling shape-dependent particle sorting.
PHYSICAL REVIEW LETTERS
(2022)
Article
Engineering, Electrical & Electronic
Zahra Esmati, David A. Powell, Michael C. Skipper, Michael D. Abdalla, J. Scott Tyo
Summary: This article presents a fully parameterized circuit model for array antennas, which relates antenna performance and field coupling to the physical parameters of the elements. The simplified model can be used as a surrogate for full-wave modeling during the initial optimization steps in array design. The model considers mutual coupling between array elements through the feeding network and free space, and provides excellent agreement with the scattering parameters calculated by the full-wave numerical model.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Materials Science, Multidisciplinary
Mariia Krasikova, Sergey Krasikov, Anton Melnikov, Yuri Baloshin, Steffen Marburg, David A. Powell, Andrey Bogdanov
Summary: This study develops the concept of a metahouse chamber for multiple band noise insulation, using a ventilated structure based on the idea of metamaterial systems. Broad stop-bands are achieved through strong coupling between pairs of Helmholtz resonators in the structure, demonstrating an averaged transmission attenuation of -18.6 dB within the spectral range from 1500 to 16 500 Hz both numerically and experimentally. The sparseness of the structure and the possibility of using optically transparent materials suggest the potential for partial optical transparency depending on the arrangement of structural elements.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Physics, Applied
Anastasiia Zalogina, Javid Javadzade, Roman Savelev, Filipp Komissarenko, Alexander Uvarov, Ivan Mukhin, Ilya Shadrivov, Alexey Akimov, Dmitry Zuev
Summary: The emission properties of nitrogen-vacancy (NV) centers in nanodiamonds placed in the near-field zone of silicon nanoresonators are investigated. It is demonstrated experimentally that the spontaneous emission rate of single NV centers in 50 nm nanodiamonds can be modified by their coupling to spherical nanoantennas, reducing the mode of the lifetime distribution by approximately 2 times from 16 to 9 ns. It is also shown that the collected intensity of photoluminescence emission from multiple NV centers in a 150 nm nanodiamond coupled to a cylindrical nanoantenna is increased by more than 50% compared to the intensity from the same nanodiamond on a bare substrate.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Yana V. Izdebskaya, Ziwei Yang, Vladlen G. Shvedov, Dragomir N. Neshev, Ilya V. Shadrivov
Summary: In this work, a multifunctional dynamic tuning method for dielectric metasurfaces containing liquid crystals is introduced and demonstrated. By rotating an external magnetic field in 3D, the electric and magnetic resonances of the metasurfaces can be tuned, allowing for independent control and multifunctional operation. This approach eliminates the need for pre-alignment of liquid crystals and is not limited by a finite set of molecular orientations. The results open up new possibilities for dynamically reconfigurable devices and the observation of novel physical effects.
Proceedings Paper
Engineering, Electrical & Electronic
Toufiq Md Hossain, Andrey E. Miroshnichenko, David A. Powell
Summary: A novel boundary tunable planar metasurface antenna is proposed for computational microwave imaging. The antenna utilizes tunable switching arrangement to create diverse beam patterns, effectively capturing scene information. The superior performance of the proposed antenna is validated by analyzing the singular value decomposition of the field patterns in the scene plane, compared to the previously reported frequency diverse approach.
2022 INTERNATIONAL SYMPOSIUM ON ANTENNAS AND PROPAGATION (ISAP)
(2022)
Review
Biochemical Research Methods
Shahrokh Sepehrirahnama, Abhishek Ray Mohapatra, Sebastian Oberst, Yan Kei Chiang, David A. Powell, Kian-Meng Lim
Summary: The motion of small objects in acoustophoresis is influenced by the acoustic radiation force and torque, which are nonlinear phenomena consisting of primary and secondary components. The tutorial presents the theory of acoustic interaction forces, describing their features and comparing theoretical results with experimental measurements. It also demonstrates the clustering patterns induced by close-range interaction of objects.
Article
Optics
Quanlong Yang, Dongyang Wang, Sergey Kruk, Mingkai Liu, Ivan Kravchenko, Jiaguang Han, Yuri Kivshar, Ilya Shadrivov
Summary: This article introduces a method of using topological devices to achieve on-chip integration and miniaturization, addressing the existing problems in terahertz technology. By designing and fabricating topological devices based on valley-Hall photonic structures, valley-locked asymmetric energy flow and mode conversion are achieved. The application of topological membrane metasurfaces brings many features to on-chip photonics and terahertz technology.
ADVANCED PHOTONICS
(2022)
