Article
Physics, Multidisciplinary
Fumiaki Miyamaru, Chihiro Mizuo, Toshihiro Nakanishi, Yosuke Nakata, Kakeru Hasebe, Shintaro Nagase, Yu Matsubara, Yusuke Goto, Joel Perez-Urquizo, Julien Madeo, Keshav M. Dani
Summary: The experimental demonstration involves observing frequency-shift dynamics at a temporal boundary in the terahertz (THz) region using a scheme that controls the structural dispersion of a metal-semiconductor waveguide. Ultrafast structural-dispersion switching is achieved within a subpicosecond timescale by illuminating the waveguide surface with an optical pump pulse during THz pulse propagation. The high conversion efficiency, up to 23%, allows for direct observation of rapid THz frequency variation around the temporal boundary.
PHYSICAL REVIEW LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Yajie Liu, Xin Sun, Zhiming Song, Xiaofang Liu, Ronghai Yu
Summary: This paper introduces a novel ultralight and ultrathin EMW absorber based on a parallel Ni wire array, and proposes an orientation-enhanced strategy to improve absorption performance. The study found that the parallel orientation of wires can enhance interfacial polarization, improve dielectric and magnetic losses, and enhance impedance matching. The parallel Ni wire array exhibits excellent EMW absorption and achieves the largest specific reflection loss among magnetic wire-based absorbers.
ADVANCED ELECTRONIC MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Ling-Feng Mao
Summary: In this paper, a proposed physical model based on the tunnelling concept is used to explain the coupling between acoustic waveguides. The model, which introduces a virtual mass and potential for phonons, provides a new idea for understanding and studying the coupling phenomenon. It shows a good agreement with the experimental data and can explain the exponential dependence of the coupling length on the guide separation distances and frequency of acoustic waves.
RESULTS IN PHYSICS
(2022)
Article
Chemistry, Physical
Haoran Yuan, Yuping Wang, Bing Suo, Shen Zhang, Hongwei Dong, Feng Yan, Chunling Zhu, Yujin Chen
Summary: In this study, nitrogen-doped graphene-coated FeNi nanoparticles were prepared on N-doped carbon nanosheets, and simulations were used to analyze the dielectric and magnetic properties of different samples. The results showed that Ni@NGLs/NC had the highest dielectric loss, but exhibited the worst electromagnetic wave absorption properties among the samples. These findings highlight the importance of balancing loss and impedance matching for an EMW absorber.
JOURNAL OF ALLOYS AND COMPOUNDS
(2021)
Article
Engineering, Electrical & Electronic
N. Zerounian, W. Aouimeur, A. -S. Grimault-Jacquin, G. Ducournau, C. Gaquiere, F. Aniel
Summary: A technology based on polymer has been developed for sub-millimeter single-mode conductor-backed coplanar waveguides with good agreement between experimental performances and analytical and numerical modeling. The extraction of attenuation factor, relative phase velocity, and characteristic impedance at 600 GHz is achieved using a two-tier Thru-Reflect-Line correction and square root of Thru de-embedding method, with the fundamental propagating mode remaining unique over a wide frequency range. The loss performance of the coplanar waveguides opens the road for fully integrated THz circuits at the state-of-the-art level.
JOURNAL OF ELECTROMAGNETIC WAVES AND APPLICATIONS
(2021)
Review
Chemistry, Multidisciplinary
Ming Qin, Limin Zhang, Hongjing Wu
Summary: Comprehensive views on dielectric loss mechanisms provide important guidance for understanding the attenuation behavior of materials. Current researches focus more on materials synthesis rather than in-depth mechanism study. Therefore, further research on in-depth mechanisms, emphasis on new dielectric loss mechanisms, and new modulation strategies are needed to achieve simple and effective EM wave attenuation behavior modulation.
Article
Nanoscience & Nanotechnology
Vissarion Mikhelashvili, Lior Gal, Guy Seri, Sven Bauer, Igor Khanonkin, Ori Eyal, Amnon Willinger, Johann Reithmaier, Gadi Eisenstein
Summary: We conducted a comprehensive study on the temperature dependent electronic and optoelectronic properties of a tunnelling injection quantum dot laser. The optical power-voltage (P-opt-V) characteristics were found to be correlated with the current-voltage (I-V) and capacitance-voltage (C-V) dependencies at low and elevated temperatures. Cryogenic temperature measurements revealed resonant tunnelling behaviors manifested in periodic responses of the I-V and Popt-V characteristics, which disappeared above 60 K. The C-V characteristics exhibited hysteresis due to charging and de-charging of the quantum dots, as well as negative capacitance. The combination of electrical and electro-optical characteristics served as a powerful tool to study intricate details of the laser operation.
Article
Engineering, Environmental
Xin Sun, Yanhui Pu, Fan Wu, Junzhe He, Gao Deng, Zhiming Song, Xiaofang Liu, Jianglan Shui, Ronghai Yu
Summary: The hierarchically designed Co9S8/CNTs/MoS2 composite exhibits significantly improved EMW absorbing properties, reducing filler loading and broadening absorption bandwidth. Through simulating electric field distribution and radar scatter section, the significant suppression effect of Co9S8/CNTs/MoS2 on electromagnetic scattering radiation is further revealed.
CHEMICAL ENGINEERING JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Chung-Yuan Liu, Hsiang-En Ding, Shih-Hsien Wu, Tzong-Lin Wu
Summary: This article introduces a novel 1-D photonic crystal fence that can significantly reduce crosstalk between HDWs. The method provides higher degrees of freedom for HDW design and demonstrates good field confinement in the mm-wave range. The all-dielectric-based solution shows potential for application from subterahertz to optical frequencies.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2021)
Article
Materials Science, Ceramics
Jie Liu, Chunmiao Liu, Yanchun Tong, Haibin Sun, Hui Peng, Mingwei Zhang, Shigang Wu, Hongying Zhang, Hongyu Gong, Zhiqin Zheng, Xue Guo, Yurun Feng
Summary: In this study, SiCN/Fe/Ni ceramics codoped with iron acetylacetonate and nickle acetylacetonate were synthesized using the polymer-derived ceramics method. The microstructure, phase composition, and electromagnetic wave absorption properties were analyzed. The results showed that the materials had high polarization loss and conduction loss, leading to excellent electromagnetic wave absorption performance.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Multidisciplinary
Huipeng Lv, Chen Wu, Faxiang Qin, Huaxin Peng, Mi Yan
Summary: The two-dimensional sandwiched FeNi@SnO2 design achieved an ultra-wide effective absorption bandwidth of 11.70 GHz with strong absorption of -49.1 dB at a thickness of 1.75 mm. This structure not only achieved superior electromagnetic wave absorption, but also provided a versatile strategy to integrate different loss mechanisms in the design of electromagnetic wave absorbers with extra-wide bandwidth.
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
(2021)
Article
Nanoscience & Nanotechnology
Qingqing Chen, Daxin Li, Xingqi Liao, Zhihua Yang, Dechang Jia, Yu Zhou, Ralf Riedel
Summary: Lightweight SiBCN ceramic nanofibers with tunable electromagnetic wave absorption were prepared by electrostatic spinning and high-temperature annealing techniques. The defect-free nanofibers, composed of an amorphous matrix, beta-SiC, and free carbon nanocrystals, exhibited good microwave absorption properties after annealing at 1600 degrees C. The optimized microstructure endowed the SiBCN ceramic nanofibers with potential applications as lightweight and ultrastrong radar wave absorbers in military and commercial markets.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Nanoscience & Nanotechnology
Soumen Pradhan, R. Thiyagarajan, Sai Pavan Prashanth Sadhu, M. S. Ramachandra Rao
Summary: Negative capacitance effect (NCE) was observed in 0.65Pb(Mg1/3Nb2/3)O-3-0.35PbTiO(3) (PMN-PT)/SrRuO3 heterostructures grown on Pt/Ti/SiO2/Si substrate using pulsed laser deposition (PLD) technique. The PMN-PT thin film exhibited excellent ferroelectric and dielectric properties with high P-S value, epsilon(r), and low tan delta. Dielectric resonance was achieved around 3 MHz and showed characteristics of NCE after the ferroelectric phase transition. The observation of NCE in PMN-PT on Si substrate will contribute to a better understanding of its fundamental aspects and potentially revolutionize the semiconductor industry.
SCRIPTA MATERIALIA
(2023)
Article
Chemistry, Physical
Sangkyu Lee, Gyuyong Kim, Hongseop Kim, Minjae Son, Yaechan Lee, Yoonseon Choi, Jongmyung Woo, Jeongsoo Nam
Summary: In this study, high-strength concrete was fabricated with hooked-end steel or amorphous metallic fibers, and the electrical conductivity and electromagnetic shielding effectiveness were evaluated. Amorphous metallic fibers were found to be more effective in forming a conductive network and improving the shielding effectiveness compared to hooked-end steel fibers, especially at low contents.
Article
Engineering, Electrical & Electronic
Pawan Kumar Srivastava, Yasir Hassan, Duarte J. P. de Sousa, Yisehak Gebredingle, Minwoong Joe, Fida Ali, Yang Zheng, Won Jong Yoo, Subhasis Ghosh, James T. Teherani, Budhi Singh, Tony Low, Changgu Lee
Summary: Twisted black phosphorus homostructures can be used to create resonant tunnelling diodes, where the interlayer twist angle can be used to control the vertical transport behavior.
NATURE ELECTRONICS
(2021)
Article
Chemistry, Multidisciplinary
Nikita Nefedkin, Ahmed Mekawy, Jonas Krakofsky, Yongrui Wang, Alexey Belyanin, Mikhail Belkin, Andrea Alu
Summary: Engineered intersubband transitions in multi-quantum well semiconductor heterostructures exhibit high second-order nonlinear susceptibilities in metasurfaces. By optimizing the design, the saturation limits in mid-infrared frequency upconversion in nonlinear metasurfaces are significantly extended. This has important implications for night-vision imaging and compact nonlinear wave mixing systems.
ADVANCED MATERIALS
(2023)
Article
Nanoscience & Nanotechnology
Alex Krasnok, Andrea Alu
Summary: This paper discusses the unique opportunities that symmetry violations provide in nanophotonics and introduces methods for controlling wave interactions in nanostructures to achieve various functionalities.
Review
Optics
Hannah Price, Yidong Chong, Alexander Khanikaev, Henning Schomerus, Lukas J. Maczewsky, Mark Kremer, Matthias Heinrich, Alexander Szameit, Oded Zilberberg, Yihao Yang, Baile Zhang, Andrea Alu, Ronny Thomale, Iacopo Carusotto, Philippe St-Jean, Alberto Amo, Avik Dutt, Luqi Yuan, Shanhui Fan, Xuefan Yin, Chao Peng, Tomoki Ozawa, Andrea Blanco-Redondo
Summary: Topological photonics controls the behavior of light through the design of photonic structures, with potential applications in photonics devices. This roadmap surveys emerging areas of research within this field, with a focus on addressing fundamental scientific questions and presenting exciting opportunities for future research and developments.
JOURNAL OF PHYSICS-PHOTONICS
(2022)
Article
Optics
Felipe Bernal Arango, Filippo Alpeggiani, Donato Conteduca, Aron Opheij, Aobo Chen, Mohamed Abdelrahman, Thomas F. Krauss, Andrea Alu, Francesco Monticone, Laurens Kuipers
Summary: Near-field scanning optical microscopy is a powerful technique for imaging below the diffraction limit. In this study, a cloaked near-field probe is designed and fabricated by controlling and balancing its electric and magnetic polarizabilities through nanostructuring. The probe-induced perturbations are largely suppressed, allowing for non-invasive near-field optical microscopy of classical and quantum nanosystems.
Editorial Material
Materials Science, Multidisciplinary
Andrea Alu
Summary: The appointment of Alessandro Salandrino as Deputy Editor for Optical Materials Express is announced by Editor-in-Chief, Andrea Alu.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Chemistry, Multidisciplinary
Julian Klein, Zhigang Song, Benjamin Pingault, Florian Dirnberger, Hang Chi, Jonathan B. Curtis, Rami Dana, Rezlind Bushati, Jiamin Quan, Lukas Dekanovsky, Zdenek Sofer, Andrea Alu, Vinod M. Menon, Jagadeesh S. Moodera, Marko Loncar, Prineha Narang, Frances M. Ross
Summary: Atomic-level defects in van der Waals (vdW) materials are essential for quantum technologies and sensing applications. The magnetic semiconductor CrSBr, with a direct gap and rich magnetic phase diagram, exhibits optically active defects that are correlated with the magnetic environment. The narrow defect emission in CrSBr is related to both the bulk magnetic order and an additional defect-induced magnetic order. This study establishes vdW magnets like CrSBr as an exceptional platform for studying defects and creating tailor-made magnetic textures with optical access.
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
Nanoscience & Nanotechnology
Guangwei Hu, Weiliang Ma, Debo Hu, Jing Wu, Chunqi Zheng, Kaipeng Liu, Xudong Zhang, Xiang Ni, Jianing Chen, Xinliang Zhang, Qing Dai, Joshua D. Caldwell, Alexander Paarmann, Andrea Alu, Peining Li, Cheng-Wei Qiu
Summary: Various optical crystals with opposite permittivity components have been observed and characterized in the mid-infrared regime. These crystals possess hyperbolic polaritons with large-momenta optical modes and wave confinement, making them promising for nanophotonic on-chip technologies. Monoclinic CdWO4 crystals are shown to exhibit symmetry-broken hyperbolic phonon polaritons and offer new opportunities for polaritonic phenomena.
NATURE NANOTECHNOLOGY
(2023)
Article
Nanoscience & Nanotechnology
Andrea Cordaro, Brian Edwards, Vahid Nikkhah, Andrea Alu, Nader Engheta, Albert Polman
Summary: As traditional microelectronic technology reaches its limits in speed and power consumption, there is a strong demand for novel computing strategies. Analogue optical computing has the advantage of processing large amounts of data at high speeds with negligible energy costs. Researchers have recently explored ultrathin optical metasurfaces for real-time image processing, particularly for edge detection. By incorporating feedback, they have also demonstrated that metamaterials can be used to solve complex mathematical problems, although this has been limited to guided-wave systems and large setups. This study presents an ultrathin Si metasurface-based platform for analogue computing, capable of solving Fredholm integral equations of the second kind using free-space visible radiation. The device combines an inverse-designed Si-based metagrating with a semitransparent mirror to perform the required Neumann series and solve the equation in the analogue domain at the speed of light. The use of visible wavelength operation enables a compact, ultrathin device that can be integrated on a chip and has high processing speeds.
NATURE NANOTECHNOLOGY
(2023)
Editorial Material
Materials Science, Multidisciplinary
Andrea Alu
Summary: Optical Materials Express Editor-in-Chief, Andrea Ali, has introduced new topic categories for the Journal, redefining the Journal scope and better reflecting the current state of this dynamic field of research.
OPTICAL MATERIALS EXPRESS
(2023)
Article
Nanoscience & Nanotechnology
Sander A. . Mann, Heedong Goh, Andrea Alu
Summary: Enabling strong nonlinear optical phenomena requires carefully designed photonic devices to maximize light-matter interactions. Topology optimization has been widely used in optimizing photonic devices due to its efficiency in dealing with large parameter spaces. However, the application of topology optimization in nonlinear effects in dielectric structures is limited.
Article
Nanoscience & Nanotechnology
Nikita Nefedkin, Michele Cotrufo, Andrea Alu
Summary: Nonreciprocity originating from classical interactions among nonlinear scatterers is explored in this work, offering a promising tool for quantum information processing and quantum computing. It is shown that large nonreciprocal responses can be achieved in nonlinear systems by controlling the position and transition frequencies of the atoms, without requiring a nonreciprocal environment. The connection between this effect and the asymmetric population of a slowly decaying dark state is demonstrated.
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)
Review
Optics
Emanuele Galiffi, Romain Tirole, Shixiong Yin, Huanan Li, Stefano Vezzoli, Paloma A. Huidobro, Mario G. Silveirinha, Riccardo Sapienza, Andrea Alu, J. B. Pendry
Summary: This review comprehensively discusses the recent progress of time modulation in photonic metamaterials, including temporal switching, photonic time-crystals, and spatiotemporal modulation. It also reviews and provides perspectives on the applications of time modulation in nonreciprocity, synthetic motion, giant anisotropy, etc.
ADVANCED PHOTONICS
(2022)
Article
Quantum Science & Technology
Nikita Nefedkin, Michele Cotrufo, Alex Krasnok, Andrea Alu
Summary: This study investigates nonreciprocal wave phenomena in atom-like quantum systems and reviews different approaches to isolation and nonreciprocity in quantum systems. It discovers that nonreciprocity induced by nonlinearity and discusses its underlying physics.
ADVANCED QUANTUM TECHNOLOGIES
(2022)
