Article
Optics
Hamid Akbari-chelaresi, Pooria Salami, Leila Yousefi
Summary: Due to the wave nature of light, the resolution of conventional imaging systems is limited. In this paper, a high-order continuous dielectric metasurface is designed to convert evanescent waves into propagating modes, enabling the reconstruction of super-resolution images in the far field.
Article
Engineering, Electrical & Electronic
Zhongqing Fang, Xiaofang Yang, Xiaolin Chen, Rugang Wang, Feng Zhou, Weibin Kong, Chuanjie Chen
Summary: This study investigates the light transmission and reflection spectra of parity-time symmetric dielectric metasurfaces, and explores the manipulation of Kerker effects and resonances through gain and loss modulation. These findings have important implications for practical applications in nanophotonics.
IEEE PHOTONICS JOURNAL
(2022)
Article
Physics, Applied
Chun Min Li, Shengyuan Zhang, Haibo Chen, Wenjing Ye
Summary: As the most popular mechanism, the generalized Snell's law has been extensively used for designing metasurfaces that manipulate waves. However, it has been observed that the performance of these metasurfaces is not always determined solely by the generalized Snell's law, and sometimes the wave fields exhibit contradictory behavior. This study systematically investigates the generalized Snell's law for elastic waves through numerical simulations. The inherent assumptions of the law are examined, and the effects of various implementation issues on the metasurface performance are studied. The study also identifies and theoretically justifies the fundamental mechanism responsible for producing wave components that do not obey the generalized Snell's law, and provides design guidelines for improved metasurface performance.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Optics
Maryam Hesari-Shermeh, Bijan Abbasi-Arand, Mohammad Yazdi
Summary: The analysis and synthesis of metasurfaces at various wavelengths is crucial, with a focus on the impact of substrates. A new method based on independent studies of electromagnetic behavior and interactions of constituting nanoparticles is proposed for substrated metasurfaces. The method utilizes image theory to calculate interaction constant tensors, presenting a general and useful approach for design and analysis of substrated metasurfaces.
Article
Optics
Chunming Jiang, Dong Yao, Lingtong Meng, Chunhui Yan, Honghai Shen
Summary: Polarization remote sensing technology modifies the polarization information of the target through modulation by the optical system. Adding a lens group combined with mirrors effectively suppresses polarization aberrations, resulting in reduced diattenuation and retardance values, as well as corrected polarization cross-coupled energy.
Article
Optics
Min Ouyang, Haoyang Yu, Danping Pan, Lei Wan, Cheng Zhang, Shecheng Gao, Tianhua Feng, Zhaohui Li
Summary: Optical encryption has gained attention due to the growing importance of information security in modern society. Most encryption methods based on metasurfaces encrypt information into physical forms, limiting information sharing and compatibility with digital information processing technology. This study presents an alternative scheme where information is encrypted on optical images using metasurfaces to modulate spatial frequencies.
Article
Optics
Pramode Ranjan Bhattacharjee
Summary: This paper presents novel determinantal equations to establish theoretical proofs of generalized vectorial laws of reflection and refraction. The innovative derivation method enhances the theoretical foundation and enriches traditional optical physics literature.
Article
Engineering, Electrical & Electronic
Lei Zhang, Ming Zheng Chen, Wankai Tang, Jun Yan Dai, Long Miao, Xiao Yang Zhou, Shi Jin, Qiang Cheng, Tie Jun Cui
Summary: Digitally programmable metasurfaces can be used for wireless communication to implement both space- and frequency-division multiplexing, encoding messages through multiple channels to transmit directly to different users at different locations simultaneously without the need for digital-to-analogue conversion and mixing processes. Using a dual-channel wireless communication system based on a two-bit space-time-coding digital metasurface, two different pictures were transmitted to two users simultaneously in real time.
NATURE ELECTRONICS
(2021)
Article
Multidisciplinary Sciences
Sukhvinder Kaur, Subhajit Karmakar, Arun Jana, Shreeya Rane, Ravendra Kumar Varshney, Dibakar Roy Chowdhury
Summary: The control and manipulation of cavity resonances can be achieved through modifying the split ring resonator geometry in hybrid plasmonic metasurface, leading to the excitation of dual resonance peaks with high quality factor and multi-band resonances.
Article
Engineering, Electrical & Electronic
Wei Liu, Jun Chen Ke, Cong Xiao, Lei Zhang, Qiang Cheng, Tie Jun Cui
Summary: A broadband polarization-reconfigurable converter (BPRC) based on active metasurfaces is proposed, which can achieve polarization-reconfigurable conversion for both linear-polarization (LP) and circular-polarization (CP) incident waves in wide bands by changing the states of p-i-n diodes. The BPRC consists of three-layer metal patches, three-layer dielectric substrates, and p-i-n diodes. The conversion ratio is higher than -1 dB in the frequency range of 7.4-12 GHz, with a relative bandwidth of 47.4%.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Nanoscience & Nanotechnology
Siyuan Shen, Zhaohui Ruan, Yuan Yuan, Heping Tan
Summary: This paper discusses the conditions for establishing the generalized Snell's law of refraction in all-dielectric metasurfaces, and summarizes the relationship between the highest achievable anomalous refraction efficiency and the number of nanoparticles. Additionally, conditions for establishing the polarization-independent generalized Snell's law of refraction are presented.
Article
Chemistry, Multidisciplinary
Jiawei Wang, Wenfeng Cai, Huilin He, Mengjia Cen, Jianxun Liu, Delai Kong, Dan Luo, Yan-Qing Lu, Yan Jun Liu
Summary: This paper proposes an electrically programmable metasurface enabled by dual-frequency cholesteric liquid crystals, which can achieve polarization multiplexing and demonstrate multiple optical effects.
Article
Optics
Liqiao Jing, Xiao Lin, Zuojia Wang, Ido Kaminer, Hao Hu, Erping Li, Yongmin Liu, Min Chen, Baile Zhang, Hongsheng Chen
Summary: Free-electron radiation phenomena have great potential in creating light emission with highly tunable spectra, covering a wide range of frequencies from microwave to X-ray. These phenomena can be applied in various fields such as on-chip light sources, particle accelerators, and medical imaging. Anomalous free-electron radiation has been demonstrated at the microwave regime from gradient bianisotropic metasurfaces, utilizing new degrees of freedom in polarization shaping beyond the common spectral and angular shaping.
LASER & PHOTONICS REVIEWS
(2021)
Article
Optics
Xue Zhang, Lingling Huang, Ruizhe Zhao, Qunshuo Wei, Xin Li, Guangzhou Geng, Junjie Li, Xiaowei Li, Yongtian Wang, Shuang Zhang
Summary: Optical vortex beams offer a new way to carry optical information with an unbounded number of orbital angular momentum channels. By tailoring the local phase gradient, multiplexed generalized vortex beams with custom-defined closed-loop beam profiles can be generated. Different polarization channels of metasurfaces are utilized to create multiple generalized vortex beams with independent intensity profiles, enabling various optical modulating capabilities such as precise particle manipulation, optical source, and OAM encryption.
LASER & PHOTONICS REVIEWS
(2022)
Article
Optics
Veysel Ercaglar, Hodjat Hajian, Andriy E. Serebryannikov, Ekmel Ozbay
Summary: The proposed multifunctional gradient metasurfaces, composed of binary Si microcylinders integrated with VO2 and graphene, can advance THz science and technology by providing tunable features. These metasurfaces act as transmittive or reflective beamsplitters for VO2 and can be used in THz interferometers, multiplexers, and light absorbers.
Article
Optics
V. A. Loiko, A. Konkolovich, A. A. Miskevich, D. Manaila-Maximean, O. Danila, V Circu, A. Barar
JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER
(2020)
Article
Biochemistry & Molecular Biology
Florentina L. Chiriac, Monica Ilis, Augustin Madalan, Doina Manaila-Maximean, Mihail Secu, Viorel Circu
Summary: This study investigated the liquid crystalline behavior and luminescence properties of lanthanide complexes by synthesizing organic ligands with different chain lengths. Results showed that complexes with longer chains exhibited liquid crystalline properties, with emission spectra typical of lanthanide ions.
Article
Chemistry, Analytical
Octavian Danila, Doina Manaila-Maximean, Ana Barar, Valery A. Loiko
Summary: Simulations were conducted on the spectral behavior of non-layered gold-silicon and all-silicon frequency-selective metasurfaces in the mid-infrared spectral window, demonstrating their viability for applications in absorbers, sensors, and imaging systems.
Article
Polymer Science
Octavian Danila
Summary: Theoretical investigations were conducted in the terahertz G-band for a piezoelectrically-responsive ring-cone element metasurface, showing the capability to achieve complete electric field polarization control, near-zero optical switching, and resonant behavior. The metasurface's spectral response is dependent on the combination of polymer elements and substrates, with the ability to modify the phase of reflected and transmitted waves for full electric field polarization control. The architecture's uniqueness lies in the combination of readily-available materials and the introduction of an extra degree of freedom through the longitudinal piezoelectric effect, offering potential for various terahertz applications.
Article
Chemistry, Physical
Octavian Danila, Ana Barar, Marian Vladescu, Doina Manaila-Maximean
Summary: This paper introduces a k-surface framework for describing the dispersion properties of media with designer electric and magnetic responses, including positive and negative values as well as the coupling between the two.
Article
Crystallography
Isabela Dumitru, Florentina L. Chiriac, Monica Ilis, Iuliana Pasuk, Doina Manaila-Maximean, Marin Micutz, Teodora Staicu, Viorel Circu
Summary: This work describes the synthesis and characterization of novel ionic liquid crystals based on pyridinium salts. The stability of the liquid crystals is influenced by the length of the alkyl chains, with longer chains exhibiting two enantiotropic columnar phases. Surprisingly, pyridinium salts with larger counterions do not exhibit liquid crystal properties.
Editorial Material
Biochemistry & Molecular Biology
Viorel Circu, Doina Manaila-Maximean, Valery A. Loiko
Article
Biochemistry & Molecular Biology
Viorel Circu, Constantin P. P. Ganea, Mihail Secu, Doina Manaila-Maximean, George Catalin Marinescu, Roua Gabriela Popescu, Iuliana Pasuk
Summary: Two neutral copper(I) halide complexes were prepared using benzoylthiourea (BTU) ligand in ethanol. These complexes displayed interesting properties such as 2D supramolecular structures, liquid crystalline behavior, emission, and 1D ionic conduction. The chemical structure was determined through various spectroscopic techniques while the mesomorphic behavior was analyzed using DSC, POM, and XRD. The complexes exhibited a hexagonal columnar mesophase over a wide temperature range and showed solid-state emission with high quantum yields. The liquid crystal phases also facilitated anhydrous proton conduction provided by hydrogen-bonding networks.
Article
Chemistry, Physical
Ana Barar, Stephen Akwei Maclean, Octavian Danila, Andre D. Taylor
Summary: Reflective loss is a major factor limiting the power conversion efficiency of thin-film perovskite solar cells. This issue can be addressed through various methods such as anti-reflective coatings, surface texturing, and superficial light-trapping metastructures. Our research focuses on the photon trapping capabilities of a standard MAPbI(3) solar cell with a fractal metadevice as the top layer, which achieves a reflection value of R<0.1 in the visible domain. Our findings show a significant improvement compared to a reference MAPbI(3) with a plane surface, which yields a reflection of 0.25 under identical simulation conditions. We also identify the minimum architectural requirements of the metadevice and compare it with simpler structures of the same family.
Review
Polymer Science
Radu Claudiu Fierascu, Irina Fierascu, Roxana Ioana Matei (Brazdis), Doina Manaila-Maximean
Summary: Anthropogenic activities have led to the emergence of a new class of pollutants in the environment, known as emerging contaminants, which are not currently monitored in environmental studies. These pollutants include pharmaceuticals, plant protection products, personal care products, dyes, toxins, microplastics, and other industrially important intermediaries. The increasing demand for clean water and the need to remove emerging pollutants have opened up opportunities for the industrial application of natural polymers in environmental protection. This paper presents recent developments in this area and discusses the application of natural materials for the removal of other contaminants of interest, such as radioisotopes and nanoparticles. It also briefly reviews the current knowledge of process kinetics and future development prospects in this field.
Article
Polymer Science
Octavian Danila, Barry M. M. Gross
Summary: This study presents simulations on metasurface-based NO2 gas sensors operating in the telecom C band and exhibiting strong variations in reflection coefficient after assimilation of NO2 molecules. A polymer-based unit architecture, with hydrophyllic and NO2-responsive layers, allows for highly-sensitive response in the desired spectral window, overcoming limitations of absorption-based and electrical signal-based sensors. This proposed sensor architecture shows great potential for both biological and atmospheric NO2 gas-sensing applications.
