Article
Chemistry, Multidisciplinary
Bastian Haehnle, Philipp A. Schuster, Lisa Chen, Alexander J. C. Kuehne
Summary: A synthetic toolbox has been developed to create monodisperse core-shell and core-shell-shell particles composed entirely of different types of conjugated polymers. Seeded and fed-batch dispersion polymerizations based on Suzuki-Miyaura-type cross-coupling allow precise control over the interface between conjugated polymer phases, facilitating control over energy transfer phenomena. This new approach offers synthetic freedom for fine-tuning the optical properties of CPP, potentially enabling the synthesis of individual white light-emitting particles.
Article
Chemistry, Multidisciplinary
Maria Letizia De Marco, Taizhi Jiang, Jie Fang, Sabrina Lacomme, Yuebing Zheng, Alexandre Baron, Brian A. Korgel, Philippe Barois, Glenna L. Drisko, Cyril Aymonier
Summary: This study demonstrates the synthesis of Mie-resonant core-shell particles with overlapping electric and magnetic dipole resonances in the visible spectrum, allowing for tuning of the relative position and intensity of these resonances. Coating high-index particles with low-index shells coalesces the dipoles while maintaining high scattering efficiency, leading to broadband forward scattering. This synthetic strategy opens up new possibilities for metamaterial fabrication with unprecedented control over visible light manipulation.
ADVANCED FUNCTIONAL MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Yujing Ran, Zhaotan Jiang, Zhi Wang
Summary: In this study, all-nitride perfect broadband metamaterial absorbers were designed and studied, which achieve high absorption performance within specific wavelength ranges and exhibit polarization independence and high absorption at large incidence angles. These all-nitride absorbers have promising potential in related applications.
RESULTS IN PHYSICS
(2022)
Article
Nanoscience & Nanotechnology
Meng-Ju Yu, Chih-Li Chang, Hao-Yu Lan, Zong-Yi Chiao, Yu-Chia Chen, Ho Wai Howard Lee, Yia-Chung Chang, Shu-Wei Chang, Takuo Tanaka, Vincent Tung, Ho-Hsiu Chou, Yu-Jung Lu
Summary: Research has shown that a titanium nitride metasurface absorber demonstrates broadband absorption with over 92% average absorption in the wavelength range of 400 to 750 nm, attributed to localized surface plasmon resonance. By integrating this technology with a polymer photocatalyst, a 300% increase in hydrogen evolution rate was observed due to enhanced rates of light absorption, carrier separation, and hot-carrier transfer, providing a new approach for high-efficiency solar energy harvesting systems.
Article
Chemistry, Physical
Clara Bujalance, Victoria Esteso, Laura Calio, Giulia Lavarda, Tomas Torres, Johannes Feist, Francisco Jose Garcia-Vidal, Giovanni Bottari, Hernan Miguez
Summary: Organic polaritonic solar cells utilize the hybridization of sunlight absorbers and resonator photon modes through strong coupling to control and enhance performance of the devices. Rational design of the layered structure is crucial for optimizing both spectral and angular response of sunlight harvester dyes in ultrastrong coupling regime.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Review
Engineering, Chemical
Tong Zhang, Shan-Jiang Wang, Xiao-Yang Zhang, Ming Fu, Yi Yang, Wen Chen, Dan Su
Summary: Nanostructure-based broadband absorbers show high efficiency in light absorption for solar energy harvesting. Continual improvement in mechanism and design strategies based on different materials, along with the development of solar energy thermal utilization technology, will have significant impacts on the future of solar energy utilization, seawater purification, and photoelectronic device design.
FRONTIERS OF CHEMICAL SCIENCE AND ENGINEERING
(2021)
Article
Nanoscience & Nanotechnology
Zhiyuan Xi, Shuang Li, Li Yu, Hongjie Yan, Meijie Chen
Summary: Solar interfacial evaporation for freshwater harvesting is an efficient and environmentally friendly method. Traditional methods have losses due to thermal radiation and heat conduction, and cannot collect water at night. This study presents an all-day freshwater-harvesting device using a solar-selective absorber and sky radiative cooling, showing high efficiency and potential application.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Nanoscience & Nanotechnology
Beatrice R. Bricchi, Luca Mascaretti, Simona Garattoni, Matteo Mazza, Matteo Ghidelli, Alberto Naldoni, Andrea Li Bassi
Summary: This research utilizes pulsed laser deposition to transform TiN into hierarchical oxynitride films with a nanocrystalline and nanoporous structure. These tree-like films exhibit strong broadband solar absorption and can generate high temperatures under moderate light concentration. The unique properties of these films provide new possibilities for solar energy absorption.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Chemistry, Physical
Libo Yu, Wang Hao, Zhen Li, Xuefeng Ren, Huiwen Yang, Huan Ma
Summary: ZnO core/shell hollow microspheres have great potential in QDSSCs, as they increase QDs loadings and enhance light scattering, improving light harvesting capability and photovoltaic performance significantly.
CHEMICAL PHYSICS LETTERS
(2021)
Article
Polymer Science
Irina Yu Krasnova, Dmitrii Yu Antonov, Alexey Shapovalov, Zinaida B. Shifrina
Summary: New polyphenylene dendrimers were developed by attaching aromatic dendron units to a highly emissive core through DielsAlder reaction, leading to efficient UV absorption and energy transfer, resulting in high quantum yield photoluminescence. The optical properties of these dendrimers with the [2.2]paracyclophane core were analyzed using parent model compounds, highlighting the success of the study with improved synthetic procedures.
Article
Green & Sustainable Science & Technology
Soomin Son, Jaemin Park, Sucheol Ju, Daihong Huh, Junho Jun, Kwan Kim, Pil-Hoon Jung, Heon Lee
Summary: Ni nanowires and Au/Ni core-shell nanowire absorbers, fabricated through a cost-effective process, exhibit high absorption and photothermal conversion efficiency for efficient solar vapor generation, with over 98% and 91% of incident light absorbed by each absorber respectively.
ADVANCED SUSTAINABLE SYSTEMS
(2021)
Article
Chemistry, Multidisciplinary
Wei Chen, Yuan Gao, Yuyang Li, Yiming Yan, Jun-Yu Ou, Wenzhuang Ma, Jinfeng Zhu
Summary: This research develops a deep learning model based on metamaterial spectrum transformer (MST) for the powerful design of high-performance broadband solar metamaterial absorbers (SMA). The model divides the optical spectrum of metamaterial into N patches, overcoming the problem of overfitting in traditional deep learning and greatly enhancing the learning capability. A flexible design tool is also developed for real-time on-demand design of metamaterials with various optical functions.
Article
Chemistry, Physical
Zhijia Geng, Yifan Yu, Jie Liu
Summary: Plasmonic photocatalysis is a promising field in sustainable energy applications, with a focus on enhancing broadband light absorption capabilities for plasmonic photocatalysts. By replacing parts of the catalyst with a solar absorber, the total reaction rate can be improved significantly under mild heating conditions with less catalyst. Through careful comparison and systematic optimization, a substantial enhancement in broadband light absorption capacity and overall light effectiveness is demonstrated, leading to the development of advanced plasmonic photocatalysts with greater efficiency and practical applicability using solar light as the energy source.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Green & Sustainable Science & Technology
Linzhuang Xing, Ruipeng Wang, Yuan Ha, Zhimin Li
Summary: This paper investigates the effect of morphological parameters and external factors on the optical properties and photothermal conversion of Fe3O4@Au core/shell nanoparticles.The results show that Fe3O4@Au core/shell nanoparticles with specific parameters exhibit optimal solar thermal conversion in direct absorption solar collectors (DASCs). Furthermore, Fe3O4@Au core/shell nanoparticles with specific parameters demonstrate excellent photothermal conversion performance. This research provides guidance for utilizing solar energy and controlling the photothermal distribution of nanofluids using Fe3O4@Au core/shell nanoparticles.
Article
Chemistry, Multidisciplinary
Yuanwei Li, Ibrahim Tanriover, Wenjie Zhou, Wisnu Hadibrata, Sina Abedini Dereshgi, Devleena Samanta, Koray Aydin, Chad A. Mirkin
Summary: A synthetic strategy for preparing ultrathin, broadband metasurface absorbers is reported, which involves the surface-assembly of plasmonic octahedral nanoframes into large-area ordered monolayers. The resulting absorbers exhibit efficient light absorption across a wide range of wavelengths and are unaffected by polarization and incidence angles.
Article
Nanoscience & Nanotechnology
Xuchen Wang, Mohammad S. S. Mirmoosa, Sergei A. A. Tretyakov
Summary: This paper theoretically elucidates the effect of temporal discontinuities of effective parameters on the propagation of reactive metasurface surface waves. It shows that by switching the surface reactance value, the velocity of surface waves can be fully controlled, and the power of reflected and transmitted waves can be amplified. It also demonstrates that switching a boundary from supporting transverse-electric polarization to only allowing transverse-magnetic polarization freezes and converts the propagating surface wave to a static magnetic-field distribution. Furthermore, temporal jumps of the boundary reactance couple free-space propagating waves to the surface wave, similar to a spatial prism. These intriguing phenomena enable the generation and control of surface waves.
Article
Physics, Applied
J. A. Alvarez-Sanchis, B. Vidal, S. A. Tretyakov, A. Diaz-Rubio
Summary: By controlling geometric parameters, the quality factor of all-dielectric metasurfaces can be adjusted and designed theoretically for improved performance as sensors in the THz band. However, material losses significantly limit the resonances' quality factor, leading to the proposal of all-dielectric metasurfaces as an alternative to metal-dielectric structures. In this study, the effect of losses on all-dielectric metasurfaces is examined using realistic materials, and their sensing performance is compared with nanostructures supporting extraordinary optical transmission. The results highlight the limitations of all-dielectric metasurfaces and the superiority of structures with extraordinary optical transmission.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Applied
Hamidreza Taghvaee, Fu Liu, Ana Diaz-Rubio, Sergei Tretyakov
Summary: Breaking the diffraction limit on optical devices and achieving subwavelength focusing requires tailoring the evanescent spectrum of wave fields. This paper presents a feasible strategy based on the concepts of the perfect lens and power flow-conformal metasurfaces, allowing for subwavelength hotspot size in near-field focusing. The findings have potential applications in antennas, beam-shaping devices, nonradiative wireless power transfer systems, microscopy, and lithography.
PHYSICAL REVIEW APPLIED
(2023)
Article
Physics, Applied
M. H. Mostafa, N. Ha-Van, P. Jayathurathnage, X. Wang, G. Ptitcyn, S. A. Tretyakov
Summary: The Chu limit restricts the operational bandwidth of resonant circuits due to the size limitation of the resonator. This limitation hinders the miniaturization of antennas, as their bandwidth is inversely proportional to their size. To overcome this, we propose the use of slow time modulation of resistive elements to engineer the bandwidth of small antennas. The modulation of resistance induces a virtual impedance that can be fully controlled by modulation parameters and optimize the frequency response of a resonant circuit.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Fu Liu, Do-Hoon Kwon, Sergei Tretyakov
Summary: Reconfigurable reflectors have great potential in future telecommunication systems, and there is active research on designing and realizing full and tunable reflection control. Reflectarrays, the classical approach to scanning reflectors, are based on phased-array theory and physical optics approximation. To overcome the limitations, researchers are actively studying inhomogeneous metasurfaces using diffraction grating theory. Unifying these two approaches and studying reconfigurable reflectors from a unified point of view is necessary for achieving tunability and realizing their full potential.
IEEE ANTENNAS AND PROPAGATION MAGAZINE
(2023)
Article
Chemistry, Multidisciplinary
Shuomin Zhong, Xuchen Wang, Sergei A. A. Tretyakov
Summary: Conventional coherent absorption occurs only when two incident beams exhibit mirror symmetry. This study proposes a more general metasurface paradigm for coherent perfect absorption with impinging waves from arbitrary asymmetric directions. It shows theoretically and confirms experimentally that the relative amplitude of the reflected wave can be continuously tuned by changing the phase difference between the two beams, opening up promising possibilities for wave manipulation with applications in various fields.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Grigorii Ptitcyn, Mohammad Sajjad Mirmoosa, Amirhosein Sotoodehfar, Sergei A. Tretyakov
Summary: In recent years, there has been increasing interest in using time-modulation techniques to realize new phenomena and create new applications by varying system properties. This field, which originated in the middle of the previous century, has gained revitalized attention. In this tutorial article, the authors provide a historical overview and review the basic concepts in this field. They introduce the general theory of linear time-varying systems, discuss accounting for frequency dispersion in nonstationary systems, and elucidate models of time-varying electrical circuits and materials.
IEEE ANTENNAS AND PROPAGATION MAGAZINE
(2023)
Article
Engineering, Electrical & Electronic
Sravan K. R. Vuyyuru, Risto Valkonen, Do-Hoon Kwon, Sergei A. Tretyakov
Summary: A perfect anomalous reflector is designed based on the receiving and scattering array antenna theory to optimize the scattering characteristics of a planar reflecting surface. By algebraic optimization of the load reactances, the reflection amplitudes into propagating Floquet modes can be controlled, avoiding the need for brute-force optimization via electromagnetic simulations. Numerical designs of wide-angle reflectors show that the proposed approach achieves higher reflection efficiencies compared to conventional reflectarray designs in a computationally efficient manner.
IEEE ANTENNAS AND WIRELESS PROPAGATION LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Mostafa Movahediqomi, Grigorii Ptitcyn, Sergei Tretyakov
Summary: This article discusses four main methods for designing anomalous reflectors for microwave and millimeter-wave applications and analyzes and discusses various performance aspects.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Nanoscience & Nanotechnology
Vladislav A. Chistyakov, Viktar S. Asadchy, Shanhui Fan, Andrea Alu, Alex Krasnok
Summary: Twisted anisotropic Weyl semimetal multilayer structures are introduced to enhance the tunability of their response. The design achieves impressive isolation exceeding 50 dB with a minimal insertion loss of just 0.33 dB in the mid-IR frequency range. Moreover, the in-plane anisotropy of Weyl semimetals eliminates one or both polarizers of conventional isolator geometry, significantly reducing the overall dimensions. These results pave the way for creating highly adaptable and ultra-compact optical isolators.
Article
Nanoscience & Nanotechnology
Francisco S. S. Cuesta, Sergei Kosulnikov, Viktar S. S. Asadchy
Summary: An invisible cavity is a device that confines a localized field without scattering, and nesting two invisible cavities allows easy control of the field and quality factor. In optics, these cavities can be implemented using nanodisk-based metasurfaces near their electric resonances.
Article
Materials Science, Multidisciplinary
F. S. Cuesta, M. S. Mirmoosa, S. A. Tretyakov
Summary: One advantage of reciprocal bianisotropic metasurfaces is their ability to produce asymmetric scattering depending on the illumination side and circular polarization. However, we demonstrate that geometrical asymmetry can be emulated using nonbianisotropic layers in coherent illumination, enabling optical control of desired asymmetric scattering and chirality effects. We illustrate this concept by emulating asymmetric scattering required for creating a 180 degrees hybrid junction for plane waves using either a bianisotropic metasurface or simple sheets with electric response under simultaneous illumination by two coherent waves.
Proceedings Paper
Engineering, Electrical & Electronic
Nam Ha-Van, Constantin R. Simovski, Francisco S. Cuesta, Prasad Jayathurathnage, Sergei A. Tretyakov
Summary: We investigate a regime of radiation suppression in wireless power transfer (WPT) between two loop antennas in free space. By optimizing load impedance and working frequency, high power transfer efficiency can be achieved due to partial compensation of the radiation resistances of both antennas. This regime is analyzed for two antenna arrangements: coaxial arrangement, where WPT is solely based on near fields, and coplanar arrangement, where both near-field and far-field power transfer mechanisms are combined. The radiation suppression regime is analyzed and visualized for both arrangements. Theoretical results are validated by simulations and experiments with two loop antennas.
2023 53RD EUROPEAN MICROWAVE CONFERENCE, EUMC
(2023)
Proceedings Paper
Engineering, Electrical & Electronic
Shamsul Arefeen Al Mahmud, Prasad Jayathurathnage, Yining Liu, Jorma Kyyra
Summary: Fast automatic identification of WPT receiver is critical for future deployment of efficient and low-cost dynamic wireless power transfer devices. This article presents a new approach for receiver identification and transmitter activation in wireless power transfer systems, enabling fast charging request and energy-saving.
2023 IEEE WIRELESS POWER TECHNOLOGY CONFERENCE AND EXPO, WPTCE
(2023)
