Article
Materials Science, Multidisciplinary
Alperen Sezgin, Radim Ctvrtlik, Lukas Vaclavek, Jan Tomastik, Libor Nozka, Ebru Mensur, Seniz Turkuz
Summary: The structural, optical, and mechanical properties of magnetron sputtered TiO2 and TiO2-ZrO2 mixture transparent thin films were investigated, along with the influence of heat treatment. XPS, GI-XRD, and SEM were used to study the structural properties of the films, while spectrophotometry and spectroscopic ellipsometry were employed for optical characterizations. Nano-indentation and nano-scratch tests were used to examine the hardness and scratch behavior. The presence of ZrO2 in TiO2-ZrO2 films enhanced hardness and prevented crystallization of TiO2 after annealing, resulting in better surface quality and higher thermal stability. The addition of ZrO2 also led to a shift in absorption edge and decreased sharpness, leading to less absorption in the visible range.
MATERIALS TODAY COMMUNICATIONS
(2023)
Article
Materials Science, Coatings & Films
P. Moskovkin, C. Maszl, R. Schierholz, W. Breilmann, J. Petersen, A. Pflug, J. Muller, M. Raza, S. Konstantinidis, A. von Keudell, S. Lucas
Summary: The study focuses on correlating basic plasma properties with morphological, structural and mechanical properties of thin films deposited by high power impulse magnetron sputtering. By studying the deposition and growth of titanium films at various discharge power densities, a transition from thermally-driven to ballistically-driven Ti atom mobility was revealed. Changes in micro-crystal orientation and nano hardness of the films were observed as discharge power density increased, alongside non-monotonic variations in surface roughness behavior.
SURFACE & COATINGS TECHNOLOGY
(2021)
Article
Chemistry, Physical
M. Makowka, A. Sobczyk-Guzenda, W. Pawlak, B. Wendler, M. Gazicki-Lipman, H. Szymanowski
Summary: The study aimed to diagnose plasmas excited by two magnetron sputtering techniques and investigated the deposition of TiO2 coatings. The findings revealed differences in the mechanism of TiO2 formation during reactive sputtering and in the deposition thermodynamics between the two techniques.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Faiza Salhi, Linda Aissani, Mamoun Fellah, Abdelhakim Chadli, Abderrahmane Cheriet, Ahlam Belgroune, Corinne Nouveau, Aleksei Obrosov, Mohammed Abdul Samad, Akram Alhussein
Summary: The study investigated the effects of varying Zr content on the structure, surface properties, and mechanical performance of TiZrN thin films. It was found that increasing Zr content led to changes in lattice parameter, film thickness, and surface energy. The TiZrN film containing 18.3 at.% Zr demonstrated the best tribo-mechanical performance with low friction coefficient and wear rate.
SURFACES AND INTERFACES
(2021)
Article
Engineering, Chemical
Ning Liu, Hongsen Zhang, Qi Liu, Jiahui Zhu, Rongrong Chen, Jing Yu, Ying Li, Rumin Li, Jun Wang
Summary: In this paper, TiO2/FTO films were prepared using magnetron sputtering on the surface of FTO to achieve efficient extraction and desalination of U(VI) from seawater. The films demonstrated high extraction ratio and sterilization efficiency.
Article
Materials Science, Multidisciplinary
Jang-Hsing Hsieh, Chuan Li, Weite Wu, Shan-Lun Liu
Summary: This study successfully reduced the friction coefficient and increased the hydrophobicity of TaN coatings by introducing carbon and fluorine. It was found that increasing the carbon and fluorine contents in the films significantly improved hemocompatibility and minimized the effects of moisture on the friction coefficient.
Article
Chemistry, Physical
N. Jalalian Karazmoudeh, M. Soltanieh, M. Hasheminiasari
Summary: Undoped and Zn-doped CuO thin films were successfully fabricated by reactive magnetron sputtering. The effect of Zn dopant concentration on the photocatalytic behavior and structural properties of CuO thin films was investigated. Optimal conditions for CuO deposition and Zn doping were determined to achieve high photocatalytic degradation efficiency of methylene blue.
JOURNAL OF ALLOYS AND COMPOUNDS
(2023)
Article
Crystallography
Jun-A Kim, Jung-Hwan Park, Sang-Geon Park, Chang-Sik Son, Young-Guk Son, Dong-Hyun Hwang
Summary: Cu2O films were deposited on a glass substrate via RF magnetron sputtering, and their properties were analyzed in relation to the substrate temperature. The substrate temperature played a crucial role in shaping the structural, compositional, and optical properties of the Cu2O films. XRD analysis confirmed the cubic structure of the Cu2O films, while FE-SEM revealed a positive correlation between grain size and substrate temperature. The as-grown Cu2O film had the highest transmittance in the visible region, but it decreased with increasing substrate temperature. The energy band gap of the Cu2O films remained constant at low substrate temperatures but slightly increased at higher temperatures.
Article
Chemistry, Physical
Anna Kot, Marta Radecka, Dominik Dorosz, Katarzyna Zakrzewska
Summary: TiO2 thin films containing erbium were deposited by RF magnetron sputtering under ultrahigh vacuum conditions, showing homogeneous structure and high transparency, but with a significant 0.4 eV blue shift. Near-infrared to visible up-conversion was demonstrated, along with strong green photoluminescence upon photon absorption.
Article
Materials Science, Ceramics
Jahanbakhsh Mashaiekhy Asl, Ali Nemati, Iraj Hadi, Shamsedin Mirdamadi
Summary: This study investigates the influence of substrate materials on the growth mechanism and microstructure of Ta2O5 thin films. The results show that films grown on silicon wafers have finer crystals and better optical and morphological properties compared to films grown on BK7 glass substrates.
CERAMICS INTERNATIONAL
(2022)
Article
Materials Science, Coatings & Films
I. L. Dias, A. R. Terto, P. C. Silva Neto, D. A. Ramirez, E. K. Tentardini
Summary: In this study, the structural insertion of silicon in Zirconium nitride thin films was investigated using various characterization techniques. The results showed that silicon exists in the form of nitride and leads to a reduction in lattice parameter and grain size.
SURFACE ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Qian Long, Linqing Wang, Weijie Yu, Weijiu Huang, Li Wang
Summary: The study explores the influence of sputtering power on the structural and mechanical properties of a-SiC thin films. It is found that increasing sputtering power leads to denser films with higher hardness and elastic modulus, reaching maximum values at 180 W. The research proposes a reason for the excellent mechanical properties based on theoretical analysis and experimental results.
Article
Chemistry, Physical
D. A. Granada-Ramirez, A. Pulzara-Mora, C. A. Pulzara-Mora, A. Pardo-Sierra, A. Cardona-Bedoya, M. Perez-Gonzalez, S. A. Tomas, S. Gallardo-Hernandez, J. G. Mendoza-Alvarez
Summary: InGaN thin films were deposited on silicon substrates using RF magnetron sputtering, and the In content was controlled by adjusting the substrate temperature. The optical and structural properties of the films were analyzed, and it was found that the band gap energy increased with temperature.
APPLIED SURFACE SCIENCE
(2022)
Article
Chemistry, Physical
Baofei Hao, Jinpeng Guo, Lan Zhang, Huizhong Ma
Summary: TiO2-based heterojunction nano-thin films with CuO underlayer were prepared by magnetron sputtering. The thickness of the upper TiO2 layer and underlying CuO layer could be precisely controlled. The optimized heterojunction film exhibited excellent photocatalytic activity for Rhodamine B degradation.
JOURNAL OF ALLOYS AND COMPOUNDS
(2022)
Article
Chemistry, Physical
Tomasz Suszko, Witold Gulbinski, Karol Zaleski, Grzegorz Greczynski, Jerzy Morgiel, Vasilina Lapitskaya
Summary: Thin films of NiCr-C were deposited by pulse magnetron sputtering, and their structure, chemical composition, and magnetic properties were investigated using various characterization techniques. The results showed that amorphisation and carbon segregation occurred with increasing carbon content. The self-assembly processes during the coating growth led to the formation of nanostructures with metallic columns surrounded by carbon sheaths. The resulting films exhibited weak ferromagnetism parallel to the column axis and superparamagnetism perpendicular to the columns.
APPLIED SURFACE SCIENCE
(2022)
Article
Materials Science, Multidisciplinary
Jitao Li, Zhen Yue, Jie Li, Chenglong Zheng, Jingyu Liu, Fan Yang, Hui Li, Yating Zhang, Yan Zhang, Jianquan Yao
Summary: In this work, wavefront-controllable terahertz (THz) meta-polarizers based on all-silicon materials are reported, which have higher integration characteristics than conventional metapolarizers and wavefront-controllable PCMs. These meta-polarizers can generate polarized waves from unpolarized waves and manipulate the wavefront simultaneously, providing a new impact for THz wave manipulations.
SCIENCE CHINA-MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Zhen Yue, Jitao Li, Jie Li, Chenglong Zheng, Jingyu Liu, Die Zou, Hang Xu, Fan Yang, Hui Li, Liang Wu, Yating Zhang, Yan Zhang, Jianquan Yao
Summary: A versatile all-dielectric metasurface platform capable of dual-functional polarization manipulation for the orthogonal states of polarization in the terahertz frequency range is proposed. The platform exhibits the properties of a full-waveplate and a quarter-waveplate for different circularly polarized light. Experimental demonstrations through the design, fabrication, and characterization of representative metasurfaces validate the capability of dual-functional polarization manipulation.
Article
Materials Science, Multidisciplinary
Haoduo Jia, Xin Tang, Xinghua Zhu, Ming Li, Dai Wu, Peng Li, Jianxin Wang, Mengyao Li, Jitao Li
Summary: Graphene is widely used in terahertz photothermoelectric detection due to its unique optical properties, but its high thermal conductivity leads to suboptimal performance. We demonstrated a method using UV/ozone to oxidize graphene and create hole structures by oxidative etching. By assembling Bi at the surface defects, we formed graphene oxide (GO)-Bi films. The devices achieved a responsivity of 0.226 V/W at 0.22 THz and an NEP value of about 1.34 nW/√Hz. This simple preparation method provides new ideas for designing terahertz detectors.
Article
Optics
Haocheng Cai, Jitao Li, Luhong Mao
Summary: Optical bound states in continuum (BICs) are special lossless electromagnetic resonance modes found in optical transmission media. Metasurfaces supporting optical BICs have various image-based applications, including far-field and near-field applications. While far-field image-based applications have been proven theoretically and experimentally, the feasibility of near-field applications is still under question. This letter presents an experimental demonstration of near-field image-based applications using an all-silicon terahertz metasurface, which successfully constructs a given image by observing the electric field distribution.
Article
Materials Science, Multidisciplinary
Hui Li, Shouxin Duan, Chenglong Zheng, Jie Li, Hang Xu, Chunyu Song, Jitao Li, Fan Yang, Wei Shi, Yating Zhang, Yun Shen, Jianquan Yao
Summary: This paper introduces a single-layer all-silicon metasurface operating in the terahertz band, which can address the challenges of manipulating polarization conversion and generate focused beams with inhomogeneous polarization profiles.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Mengyao Li, Hang Xu, Silei Wang, Chunyu Song, Jitao Li, Yanyan Liu, Haijian Zhang, Chenglong Zheng, Yating Zhang, Jianquan Yao
Summary: The excellent performance of bolometers in the infrared and terahertz regions has attracted great attention. However, the lack of studies on the fine-scale spatial motion of microscopic particles in bolometers has prevented a full understanding of the physical process. Using micro-nano-scale optoelectronic performance correlation measurements, this study describes how prevalent defect states at the grain boundaries decrease current responses. Additionally, the first ion-bolometric detector is demonstrated with a significant photovoltage response to infrared and THz waves, showing great potential for large-area THz imaging applications. The ion-bolometric effect combines the broad spectral characteristics of the bolometer effect with the temperature sensitivity due to ion migration and provides a unique perspective on detector technology.
ADVANCED FUNCTIONAL MATERIALS
(2023)
Article
Chemistry, Physical
Silei Wang, Mengyao Li, Chunyu Song, Chenglong Zheng, Jitao Li, Zhongyang Li, Yating Zhang, Jianquan Yao
Summary: A tailored interface at the buried perovskite heterojunction improved the performance and reliability of n-i-p plane structure perovskite photovoltaic devices by refining interfacial properties. Using phenethylammonium iodide (PEAI) to regulate the SnO2/perovskite interface contributed to higher electronic mobility of ESLs and optimized electron extraction rate. The addition of PEAI also suppressed non-radiative recombination of perovskites and improved the crystallinity of the ESL film, leading to a higher specific detectivity, responsivity, and linear dynamic range for the metal halide perovskite photodetector (PPD) based on PEAI-modified SnO2.
APPLIED SURFACE SCIENCE
(2023)
Article
Optics
Hui Li, Chenglong Zheng, Hang Xu, Jie Li, Chunyu Song, Fan Yang, Jitao Li, Wei Shi, Yating Zhang, Jianquan Yao
Summary: In this study, an all-graphene geometric metasurface operating in the terahertz band is proposed and investigated. It can generate focused scalar vortex beams with polarization-independent properties by introducing a superposition of two helical phases. By embedding polarization modulation, multiple focused vortices with inhomogeneous polarization properties can be generated. The proposed design scheme has a greater degree of freedom and can find potential applications in meta-optics, high-tolerance edge imaging, and high-capacity optical communications.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Jitao Li, Zhen Yue, Jie Li, Chenglong Zheng, Yating Zhang, Jianquan Yao
Summary: By breaking the in-plane C2 and mirror symmetries of a planar all-silicon THz metasurface, we construct quasi bound states in continuum (quasi-BIC) with high quality factor and ultra-low radiative loss, achieving customizable manipulation of THz chirality in an ultra-narrow bandwidth.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Haocheng Cai, Jitao Li, Luhong Mao
Summary: Quasi-bound states in the continuum (q-BICs) in optical metasurfaces have unique radiation polarization properties. This study investigates the relationship between the radiation polarization state of a q-BIC and the polarization state of the output wave, and proposes a perfect linear polarization wave generator controlled by the q-BIC. The proposed q-BIC has an x-polarized radiation state, and the y co-polarized output wave is completely eliminated by introducing additional resonance at the q-BIC frequency. The device can efficiently obtain narrowband linearly polarized waves from non-polarized waves and can be used for polarization-sensitive high-performance spatial filtering.
Article
Computer Science, Information Systems
Jitao Li, Zhen Yue, Jie Li, Chenglong Zheng, Silei Wang, Mengyao Li, Yating Zhang, Yan Zhang, Jianquan Yao
Summary: This paper designs spatially interleaved terahertz metasurfaces based on the ingenious spatial interleaving principles and demonstrates diverse wavefront manipulations in the terahertz range. The functions performed include OAM superposition of single-frequency vortex beams, separate vortex focusing of single-frequency dual beams, different OAM manipulations of bifrequency beams in different planes, and achromatic focusing. These functions prove that spatially interleaved metasurfaces can manipulate terahertz wavefronts at both single frequency and bifrequency, which traditional metasurfaces cannot. This work paves the way for diverse terahertz wavefront manipulations.
SCIENCE CHINA-INFORMATION SCIENCES
(2023)
Article
Physics, Multidisciplinary
Hui Li, Chenglong Zheng, Jingyu Liu, Hang Xu, Chunyu Song, Fan Yang, Jitao Li, Zhen Yue, Wei Shi, Yating Zhang, Yan Zhang, Jianquan Yao
Summary: In this study, a versatile design for generating off-axis vector terahertz beams on all-silicon metasurfaces using binary encoding approach is demonstrated. The experimental results showed that manipulation of the encoding method within orthogonal circularly polarized channel enables the generation of diverse vector terahertz beams with arbitrary polarization profiles and directional emission of multiplexed vector vortex beams with specified polarization states. The introduction of latitudinal polarization control factor allows the generation of continuously rotating or independently designed vector polarization profiles on a pre-defined focal plane.
SCIENCE CHINA-PHYSICS MECHANICS & ASTRONOMY
(2023)
Article
Physics, Multidisciplinary
Zhen Yue, Jitao Li, Jie Li, Chenglong Zheng, Binbin Lu, Jingyu Liu, Fan Yang, Hui Li, Yan Zhang, Yating Zhang, Xiaofei Zang, Jianquan Yao
Summary: This work proposes a transmission-mode, multichannel all-silicon metasurface platform that can independently implement functionalities in two orthogonally polarized output fields under linearly polarized incidences, promoting design flexibility. By designing, fabricating, and characterizing a monolayer metasurface composed of silicon pillars, the ability of multi-dimensional light field control, such as polarization-switchable focusing beam, is demonstrated. Additionally, the designed metasurface can generate polarization-switchable Bessel vortex beams under linearly polarized incidences, verifying the flexibility and practicality of the platform.
ANNALEN DER PHYSIK
(2023)
Article
Optics
Fan Yang, Chenglong Zheng, Jitao Li, Hui Li, Chunyu Song, Zhen Yue, Xin Ding, Yating Zhang, Jianquan Yao
Summary: It is proposed to achieve simultaneous control of the amplitude and phase of orthogonal linearly polarized lights in multichannels using an all-dielectric metasurface. Three pairs of complex amplitude information are encoded in three independent channels by selecting and combining the meta-atoms. The performance of the proposed metasurface in the terahertz (THz) band is verified through three designed examples, and the simulation results agree with experimental results. The single-layer structure design provides controllable focusing, compact structure, and simple fabrication, offering an alternative approach for integrated multifunctional and miniaturized optical devices.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Optics
Hui Li, Jie Li, Chenglong Zheng, Hang Xu, Peng Li, Chunyu Song, Fan Yang, Jitao Li, Zhen Yue, Yating Zhang, Wei Shi, Jianquan Yao, Shouxin Duan, Yun Shen
Summary: Metasurfaces are artificially designed structures that can efficiently manipulate incident waves, and have recently gained attention in terahertz radiation for their ability to overcome the complexity of bulky optical systems. In this study, we demonstrate different designs of all-silicon terahertz metasurfaces for various applications. By combining geometric and propagation phases, we achieve switchable multiple phase modulation in orthogonal circularly polarized channels. The proposed scheme allows for locked phase modulation profiles and flexible manipulation of wavefronts.
OPTICS AND LASERS IN ENGINEERING
(2023)
