Article
Chemistry, Multidisciplinary
Jingang Li, Mingsong Wang, Zilong Wu, Huanan Li, Guangwei Hu, Taizhi Jiang, Jianhe Guo, Yaoran Liu, Kan Yao, Zhihan Chen, Jie Fang, Donglei Fan, Brian A. Korgel, Andrea Alu, Yuebing Zheng
Summary: A study has reported reconfigurable chiral nanostructures with silicon nanoparticles and nanowires, allowing for tailored configurations and chiroptical responses. The optical chirality arises from the coupling between optical resonances of the silicon nanoparticle and nanowire, enabling label-free enantiodiscrimination of biomolecules in single structures. This research provides insights into high-index material design and new strategies for adaptive devices in photonic and electronic applications.
Article
Materials Science, Multidisciplinary
Jiayun Wang, Rongcao Yang, Zhaohua Li, Jinping Tian
Summary: In this paper, two multifunctional polarization converters based on asymmetric hybrid metasurface are designed to operate in the terahertz (THz) band. By controlling the pump intensity and temperature, the converters can achieve different polarization conversions in different modes.
Article
Materials Science, Multidisciplinary
Wanying Liu, Quanlong Yang, Quan Xu, Xiaohan Jiang, Tong Wu, Kemeng Wang, Jianqiang Gu, Jiaguang Han, Weili Zhang
Summary: The study investigates the implementation of terahertz mode and polarization division multiplexing using all-dielectric metasurfaces, which convert terahertz incidence with fundamental Gaussian mode into high-order HG modes while reducing beam divergence and spatially separating each mode through mode conversion and integration of phase distributions. The proposed multifunctional metasurfaces pave the way for potential applications of metasurface-based devices in terahertz communication systems.
ADVANCED OPTICAL MATERIALS
(2021)
Article
Optics
Jianbo Yu, Binze Ma, Ao Ouyang, Pintu Ghosh, Hao Luo, Arnab Pattanayak, Sandeep Kaur, Min Qiu, Pavel Belov, Qiang Li
Summary: Dielectric super-absorbing metasurfaces achieve super-high absorption rates by breaking parity-time symmetry, opening up new possibilities in optical sensing, thermal emission, photovoltaics, and photodetection devices.
Article
Chemistry, Analytical
Adrian Tamayo-Dominguez, Jose-Manuel Fernandez-Gonzalez, Oscar Quevedo-Teruel
Summary: This paper presents the design and fabrication of a mechanically reconfigurable filter at W band based on the concept of glide symmetry. The filters can achieve tunability by breaking and regenerating the glide symmetry, and have high filtering capacity that can be mechanically adjusted.
Review
Materials Science, Multidisciplinary
Ali Zabihi, Chadi Ellouzi, Chen Shen
Summary: The advent of acoustic metasurfaces (AMs) has enabled wave manipulation using thin structures with versatile capabilities such as steering, focusing, and absorption. This paper reviews recent developments in AMs and summarizes the approaches for achieving tunable control, including mechanical tuning, active control, and the use of field-responsive materials. The review provides an overview of basic concepts in each category, discusses their applications and performance, and concludes with future directions in this exciting field.
FRONTIERS IN MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Vin-Cent Su, Shao-Yang Huang, Meng-Hsin Chen, Chia-Hung Chiang, Kai-Lun Xu
Summary: This study successfully fabricated infinite-OAM meta-knobs (IOMKs) with exceptionally high OAM modes of 32 and 16. The optical tunability of IOMKs was demonstrated by illuminating them with incident light possessing diverse degrees of freedom, including different polarizations and wavelengths. The interference nature of IOMKs was experimentally explored in interference eraser measurements, demonstrating their broadband capability and high reproducibility. These findings represent a significant step toward understanding the potential applications of IOMKs in quantum optics and their promising role in the generation of complex output states.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Physics, Applied
Shuyu Zuo, Chengxin Cai, Xiaojun Li, Ye Tian, Erjun Liang
Summary: This article introduces an acoustic compact analog computing system based on acoustic metasurfaces. The proposed system utilizes a nondispersive focusing metasurface and a reconfigurable reflective metasurface to perform broadband and tunable mathematical operations. Numerical results show that the system can achieve spatial differentiation and integration in the frequency range of the incident acoustic wave, highlighting its potential applications.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Physics, Applied
Shubhanshi Sharma, Basudev Lahiri, Shailendra Varshney
Summary: This study reports the existence of multiple symmetry-protected bound states in the continuum (BICs) in all-dielectric metasurfaces made up of split-ring resonators (SRRs). Numerical simulations show that SRRs can support a high-quality factor (Q) of 106 without asymmetry, and around 8000 for realistic standalone structures, reducing to 1.25 times in the presence of a silica substrate. Introduction of out-of-plane asymmetry transforms BICs into quasi-BICs with Fano resonance. Eigenmode and multipole decomposition analysis confirm the presence of multiple BIC resonances, with dominant contributions from magnetic dipole, toroidal dipole, and electric and magnetic quadrupoles. Integration of monolayer graphene adds tunability to the metasurface, allowing for excellent switching using distinct quasi-BIC modes.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Chemistry, Multidisciplinary
Jian Zhang, Qiang Li, Chenjie Dai, Mingliang Cheng, Xin Hu, Hyun-Sik Kim, Heesun Yang, Daniel J. Preston, Zhongyang Li, Xuefeng Zhang, Won-Kyu Lee
Summary: This paper presents a general approach to developing tunable plasmonic metasurfaces with hydrogel meta-atoms at the subwavelength scale. The size of hydrogel nanodots can be reversibly controlled by absorbing or releasing water, resulting in humidity-responsive surface plasmon polaritons (SPPs) that generate plasmonic color rendering in the visible spectrum. The size variations of constituent hydrogel nanostructures enable broadband beam-steering on a phase modulator.
Article
Nanoscience & Nanotechnology
Xiaoming Qiu, Jian Shi, Yanping Li, Fan Zhang
Summary: Electrically tunable all-dielectric metasurface structures have been proposed in this study, combining indium tin oxide with guided-mode resonance to disturb the resonance wavelength in the near-infrared spectral range. The research found that in a one-dimensional structure, the transmittances at 1512 and 1510 nm changed by 20 and -14 dB, respectively, under bias voltages of 0 to 5 V, with the bilayer structure performing well in double-waveband applications.
Article
Optics
Nooshin M. Estakhri, Theodore B. Norris
Summary: The ability of phase-change materials to rapidly switch between two stable phases has led to their incorporation in metasurfaces for controlling optical fields. These structures enable the control of nonclassical two-photon quantum interference, with high switching speeds and no static power consumption. The development of compact and rapidly controllable quantum devices is opening up new possibilities in quantum applications and improving quantum logic gates and other systems.
Article
Optics
Changdong Chen, Daxing Dong, Lina Zhao, Youwen Liu, Xiaopeng Hu, Xiao Li, Yangyang Fu
Summary: This study proposes a dynamically tunable mechanism using phase-change materials to achieve a reconfigurable non-Hermitian system that enables chiral exceptional points and tunable non-reciprocal transmission. The tunable properties are nonvolatile and require no static power consumption.
Article
Optics
Yuze Hu, Hao Hao, Jun Zhang, Mingyu Tong, Xiangai Cheng, Tian Jiang
Summary: A novel metasurface platform has been demonstrated for photoactive terahertz switching by encoding temporal modulation dynamic into polarization channels. Coupled plasmonic resonators are utilized to exhibit an isotropic plasmon-induced transparency analog resonance.
LASER & PHOTONICS REVIEWS
(2021)
Article
Materials Science, Multidisciplinary
Y. Liang, Q. Gaimard, V Klimov, A. Uskov, H. Benisty, A. Ramdane, A. Lupu
Summary: By modulating the gain and loss levels of the medium, high-contrast tunable metasurfaces can be efficiently implemented, providing practical operability for the design model.
Article
Engineering, Electrical & Electronic
O. Zetterstrom, M. Petek, P. Castillo-Tapia, A. Palomares-Caballero, N. J. G. Fonseca, O. Quevedo-Teruel
Summary: This communication reports the first experimental verification of a fully metallic geodesic Luneburg lens antenna in the V-band, which exhibits low losses and a steerable directive beam. Two measures are taken to alleviate the manufacturing tolerances for the prototype, including placing electromagnetic band gap (EGB) structures and improving the electrical contact between the two pieces. The measurements confirm the applicability of geodesic Luneburg lens antennas for V-band applications, with the robust version showing good agreement with simulations.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Qingbi Liao, Nelson J. G. Fonseca, Miguel Camacho, Angel Palomares-Caballero, Francisco Mesa, Oscar Quevedo-Teruel
Summary: A fast and efficient method for designing and analyzing geodesic lens antennas is presented in this article, based on geometrical optics and scalar diffraction theory. The method is validated by comparing the results with commercial full-wave simulators, showing a significant reduction in computational resources.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Shiyi Yang, Qiao Chen, Francisco Mesa, Nelson J. G. Fonseca, Oscar Quevedo-Teruel
Summary: We propose and implement a geodesic half-Maxwell fish-eye (MFE)-lens antenna, which combines a modulated geodesic half-MFE lens and a transition to a linear flare to preserve linear polarization. The antenna design was optimized using a physical optics code and validated with electromagnetic simulation software. The antenna prototype, manufactured with CNC milling, demonstrates promising beam scanning properties and good frequency stability in the K-a-band.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Pilar Castillo-Tapia, Oskar Zetterstrom, Astrid Algaba-Brazalez, Lars Manholm, Martin Johansson, Nelson J. G. Fonseca, Oscar Quevedo-Teruel
Summary: In this work, a linear array of modulated geodesic Luneburg lens antennas operating at 56-62 GHz is proposed. The lens array antenna features 2-D beam scanning with low structural complexity. The experimental results show a good agreement with the simulated results.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Electrical & Electronic
Armando Fernandez-Prieto, Victoria dos Santos, Jesus Martel, Jose L. Medran del Rio, Francisco Mesa, Oscar Quevedo-Teruel, Rafael R. Boix, Francisco Medina
Summary: In this article, glide symmetry is utilized for the design of common-mode rejection filters based on defected ground structures. Complementary split-ring resonators are chosen as the basic components to achieve common-mode rejection. Three implementations are studied and compared to demonstrate the advantages of glide symmetry. The results show that glide symmetry offers the highest common-mode rejection level and fractional bandwidth, while barely affecting the integrity of the differential mode. Prototype designs have been simulated and tested, confirming the advantages of glide symmetry.
IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS
(2023)
Article
Engineering, Electrical & Electronic
Oskar Zetterstrom, Nelson J. G. Fonseca, Oscar Quevedo-Teruel
Summary: In this letter, an additively manufactured half-Gutman lens antenna operating at 30 GHz is presented. The hemispherical lens allows for a compact beamformer while maintaining the wide scanning capabilities of Gutman lenses. The lens is implemented with a periodic structure arranged in a body-centred cubic (BCC) lattice. The proposed antenna produces a directive beam with measured peak gain, scan loss, and sidelobe levels that agree with the simulated values. The antenna is intended for ground segment applications in low-earth-orbit satellite communication.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Ana C. Escobar, Francisco Mesa, Oscar Quevedo-Teruel, Juan D. Baena
Summary: This work proposes a method to obtain the constitutive parameters of periodic structures by computing their dispersion relation and average fields. The method utilizes the scattering parameters (S-parameters) of multiple Bloch modes of a single unit cell. The obtained multimodal scattering matrix is post-processed to calculate the dispersion relation, attenuation constant, and retrieve the impedance, permittivity, and permeability.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Chemistry, Analytical
H. Saffari, S. Hajiaghalou, M. A. Hajari, H. Gourabi, D. Fathi, R. Fathi
Summary: The mechanical properties of oocytes can predict their development potential. This study introduces a new microfluidic chip design to measure the cortical tension (CT) of oocytes and predict their maturation capability in the germinal vesicle (GV) stage. The proposed technique offers simpler operation, less specialized equipment, and faster measurements compared to traditional methods such as micro-pipette aspiration (MPA).
Article
Physics, Applied
Shiyi Yang, Oskar Zetterstrom, Zhenghui Xue, Francisco Mesa, Oscar Quevedo-Teruel
Summary: This study investigates the dispersion properties of a hexagonal dielectric periodic structure for engineering dielectric graded-index lenses. The relationship between the hexagonal structure's geometry and its symmetries is explained. Moreover, it is demonstrated that a hexagonal structure with increased symmetry is more isotropic than its conventional counterpart. To validate the analysis, a planar Luneburg lens antenna is designed, manufactured, and measured, showing a neat fan-shaped beam from 23 to 31 GHz. The results confirm the broadband operation of the periodic structure, which is of interest for cost-effective antenna designs.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Pilar Castillo-Tapia, Jose Rico-Fernandez, Oscar Quevedo-Teruel
Summary: Fully metallic geodesic lens antennas are popular for millimeter-wave applications. Here, we present experimental results of a geodesic lens array antenna that is 3D printed in one piece using laser powder-bed fusion, resulting in high conductivity and low surface roughness. The monolithic design eliminates the risks associated with assembly.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Mingzheng Chen, Francisco Mesa, Oscar Quevedo-Teruel
Summary: This article presents a time-efficient method for designing fully metallic geodesic H-plane horn antennas using ray-tracing and optimization. The proposed antennas utilize the height profile to mitigate phase errors and achieve high gains and aperture efficiencies. Two prototypes are fabricated and compared to planar counterparts, showing improved performance in terms of gain, efficiency, frequency stability, sidelobe levels, and return loss.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Chemistry, Analytical
Nelson J. G. Fonseca, Sophie-Abigael Gomanne, Jose Rico-Fernandez, Petar Jankovic, Jaione Galdeano, Giovanni Toso, Piero Angeletti, Manuel Arrebola, Oscar Quevedo-Teruel
Summary: This paper presents the design and experimental validation of a fully-metallic doubleridged waveguide 10 x 10 Rotman lens that is additively manufactured as a single part. The wide band operation of this beamformer allows for coverage of the uplink and downlink frequencies allocated to satellite communications in the K/K-a-band. The prototype shows low losses and good stability in reflection and coupling coefficients, making it a promising step towards integrated antenna systems.
Article
Chemistry, Analytical
Mohammad Javad Fahimi, Davood Fathi, Mehdi Eskandari, Narottam Das
Summary: This research study models and simulates the effects of different parameters on the electron transfer rate in quantum-dot-sensitized solar cells, including the type and thickness of the blocking layer, the diameter of the quantum dots, and the temperature. The results show that the temperature can either decrease or increase the electron transfer rate, depending on the composition of the metal oxide-quantum dot combination. Additionally, the study identifies the blocking layer type and thickness that can achieve the highest electron transfer rate.
Article
Chemistry, Analytical
Kamyar Rashidi, Davood Fathi, Javad Maleki, Hussein Taleb, Seyed Mohammad Mirjalili, Derek Abbott
Summary: This article proposes a new structure and presents multiple solutions with large-mode-area and high beam quality. Different fiber designs are optimal for different output parameters. The proposed high beam quality fibers maintain single-polarization, single-mode operation even under deviations from normal conditions.
Article
Energy & Fuels
Parham Fooladvand, Mehdi Eskandari, Davood Fathi, Narottam Das
Summary: We propose a new method of using single-walled carbon nanotubes as a hole transport layer in perovskite solar cells. By utilizing the unique quantum properties of carbon nanotubes, hole transport in the cell structure is improved, resulting in high efficiency performance. Compared to other materials, this method offers superior stability in the solar cells.