Article
Nanoscience & Nanotechnology
Qijian Jin, Gaofeng Liang, Weijie Kong, Ling Liu, Zhongquan Wen, Yi Zhou, Changtao Wang, Gang Chen, Xiangang Luo
Summary: This study presents a negative index metamaterial (NIM) made of stacked plasmonic waveguides, which enables negative refractions in the ultraviolet range. The experimental results demonstrate that this NIM can be used in subwavelength photolithography to extend the working distance and reproduce patterns with specific feature sizes.
Article
Chemistry, Analytical
Srijan Datta, Saptarshi Mukherjee, Xiaodong Shi, Mahmood Haq, Yiming Deng, Lalita Udpa, Edward Rothwell
Summary: This paper introduces the design and application of a metamaterial lens in microwave imaging and nondestructive evaluation. Experimental results demonstrate that the metamaterial lens combined with a microwave system can achieve high sensitivity detection of subwavelength defects.
Article
Optics
Wanxin Li, Jiewen Li, Lin Yu, Yang Feng, Yong Yao, Yunxu Sun, Yi Zou, Xiaochuan Xu
Summary: In this paper, the reflection-induced mutual coupling between clock-wise and counter-clock-wise resonant modes in a subwavelength grating metamaterial waveguide ring resonator (SGMRR) was investigated. It was found that this coupling breaks the degeneracy of the two modes, leading to the formation of Autler-Townes splitting. This phenomenon could be utilized to improve the detection limit of SGMRR-based sensors.
Article
Chemistry, Physical
Reza Dehbashi, Taras Plakhotnik, Timo A. Nieminen
Summary: This paper introduces the use of tuned near-zero-index materials for subwavelength projection for the first time. A novel structure composed of a two-layer slab is proposed for long-distance projection of closely spaced objects with subwavelength separation. By adjusting the relationship between the near-zero-index material and the high-index dielectric slab, clear image projection is achieved.
Article
Multidisciplinary Sciences
Alessandro Tuniz, Boris T. Kuhlmey
Summary: This article introduces a new imaging method that achieves non-invasive super-resolution imaging by selectively amplifying evanescent waves, allowing for sub-wavelength image resolution.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Weixin Liu, Yiming Ma, Yuhua Chang, Bowei Dong, Jingxuan Wei, Zhihao Ren, Chengkuo Lee
Summary: This study developed an LWIR photonic platform for gas sensing, utilizing suspended silicon waveguides and subwavelength grating metamaterial claddings. The platform was shown to have low propagation and bending losses, and functional devices such as grating couplers and Y-junctions demonstrated high performance. Sensing capabilities were showcased with toluene vapor detection, achieving a limit of detection of 75 ppm. The platform showed promise for on-site medical and environmental applications with fast response and recovery times.
Article
Materials Science, Multidisciplinary
E. Ponizovskaya Devine
Summary: In this study, vertically illuminated Si-compatible mid-infrared photodetectors based on graphene forming negative-index metamaterial are presented. The research focuses on a low-loss metamaterial structure with nano/microholes through 2D materials, supporting resonance and enhancing quantum efficiency across a wide range of incident angles.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2021)
Article
Optics
Xufend Jing, Guihong Qin, Peng Zhang
Summary: This study proposes a multi-functional metamaterial absorber based on doped silicon, which achieves broadband absorption through resonance and impedance matching, and precise amplitude control by controlling the pump luminous flux. By replacing the medium-doped silicon material with highly doped silicon material and combining it with microfluidic control, a high sensitivity sensor is realized. Experimental verification demonstrates the potential of this absorber in sensing applications.
PHOTONICS RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Ismail Hossain, Mohammad Tariqul Islam, Norsuzlin Binti Mohd Sahar, Asraf Mohamed Moubark, Mohamed S. Soliman, Md Samsuzzaman
Summary: This study explores epsilon-negative (ENG) and near-zero index (NZI) tunable cross-coupled (TCC) meta-material (MTM) unit cells for multi-band wireless communications. The designed TCC MTM unit cell has a bandwidth of 2.49-4.00 GHz, 6.89-7.83 GHz, and 9.75-10.64 GHz, respectively. The anticipated structure shows tunability, ENG and NZI characteristics, and a high EMR value, making it suitable for critical microwave applications in S, C, and X frequency bands. It has the potential to enhance the gain, bandwidth, frequency stability, and efficiency of antenna and filter designs for multi-band wireless communications.
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Ahmad Musa, Touhidul Alam, Mohammad Tariqul Islam, Mohammad Lutful Hakim, Hatem Rmili, Ahmed S. S. Alshammari, Md. Shabiul Islam, Mohamed S. S. Soliman
Summary: An oblique angle and polarization insensitive metamaterial absorber (MA) consisting of tungsten resonators on a silicon dioxide substrate, coated with additional SiO2 materials, was investigated. The proposed MA offers an average absorption of 92% from 400 nm to 2400 nm with stable oblique incident angles up to 45 degrees. The structure also achieves polarization insensitivity at the entire visible and near-infrared spectrum, making it highly potential for various optical applications.
Article
Physics, Applied
Xiao Li, Pengqi Li, Ming-Hui Lu, Mathias Fink, Guancong Ma
Summary: The study reports an experimental observation that the energy flux of an outgoing sound wave emitted by a deep-subwavelength-sized source can become negative, indicating the backward flow of energy. This phenomenon is found to be fundamentally rooted in the geometry of the wavefield itself and has implications in the time-dependent emission, absorption, and scattering of waves.
PHYSICAL REVIEW APPLIED
(2021)
Article
Agronomy
Sujitra Funsueb, Chanat Thanavanich, Parichat Theanjumpol, Sila Kittiwachana
Summary: This study proposes a flexible approach to evaluate the overall quality of fruits by aggregating multiple quality-related parameters into new fruit quality indices (FQIs). The FQIs are calculated based on selected fruit quality parameters and calibrated using near-infrared (NIR) spectra. The developed indices show a significant reduction in the measurements of quality-related parameters while still providing the overall quality of the fruit samples.
POSTHARVEST BIOLOGY AND TECHNOLOGY
(2023)
Article
Chemistry, Physical
Mohammad Reza Jafari, Akbar Asadi, Mehran Shahmansouri
Summary: In this study, a palladium-based elliptical cylinder plasmonic waveguide (PECPW) is proposed for achieving excellent propagating efficiency in the near-infrared (NIR) range. The results show that by tuning the semi-major axis Pd nanowire, wavelength of incident light, and the thickness of the dielectric layers, the proposed waveguide exhibits a normalized mode area of similar to 10(-4), a figure of merit over 8000, and a propagation length over 270 mu m. This suggests that the designed structure has lower loss and stronger surface plasmon polariton mode confinement than similar plasmonic waveguides, making it suitable for nanophotonic integrated circuits.
Article
Physics, Applied
Maxime Lanoy, Fabrice Lemoult, Geoffroy Lerosey, Arnaud Tourin, Valentin Leroy, John H. Page
Summary: Research has shown that sound waves traveling in water are scattered by a periodic arrangement of air bubbles, with the local structure of the bubbles impacting the wave propagation significantly. Depending on the arrangement of the bubbles, different effects such as bandgap formation and additional branches may occur. At a specific frequency, the material behaves as if its refractive index is -1, enabling the design of a three-dimensional lens.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Nguyen Thi Hien, Nguyen Xuan Ca, Bui Xuan Khuyen, Tran Van Huynh, Nguyen Sy Khiem, Nguyen Thanh Tung, Vu Dinh Lam, Bui Son Tung
Summary: In this article, a method to actively control the bandwidth of negative refractive index (NRI) metamaterials at terahertz frequencies is proposed using second-order hybridization. By adjusting the conductivity of semiconductor material and optimizing structural parameters, the fractional bandwidth of the double-NRI region is extended successfully.
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
(2021)
Article
Materials Science, Multidisciplinary
Eunice Y. Paik, Long Zhang, Shaocong Hou, Haonan Zhao, Yu-Hsun Chou, Stephen R. Forrest, Hui Deng
Summary: This study presents a method to assemble high quality-factor microcavities for van der Waals materials using high reflectance top mirrors. The method can be generalized to other photonic structures and will facilitate research using van der Waals materials.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Haonan Zhao, Jongchan Kim, Kan Ding, Mina Jung, Yongxi Li, Harald Ade, Jun Yeob Lee, Stephen R. Forrest
Summary: By incorporating a sterically bulky, electron-transporting host material into a conventional single host-guest emissive layer, the phase separation of the host matrix can be suppressed, leading to improved efficiency and operational lifetime of deep-blue phosphorescent organic light-emitting diodes (PHOLEDs). This bulky host allows for homogeneous mixing of the emissive layer molecules while preventing single host aggregation and nonradiative recombination. The controlled amorphous phase morphology of the mixed-host device reduces nonradiative exciton decay and enhances external quantum efficiency by 120 +/- 6% compared to a similar single-host device. Additionally, the mixed host facilitates the conduction of both charge carriers, reducing the probability of exciton annihilation and doubling the operational lifetime of deep-blue PHOLEDs.
ADVANCED MATERIALS
(2023)
Article
Automation & Control Systems
Zhiyi Chen, Boning Qu, Baoyang Jiang, Stephen R. Forrest, Jun Ni
Summary: Tension control is critical for maintaining good product quality in roll-to-roll (R2R) production systems. This study proposes a robust linear parameter-varying model predictive control (LPV-MPC) scheme to enhance tension tracking performance in a pilot R2R system. By separately handling disturbances caused by model uncertainties and dynamics changes, the controller achieves fast transient response and offset-free tension tracking.
Article
Multidisciplinary Sciences
Yan Li, Chengyu Zou, Chen Chen, Sixuan Li, Ziyu Zhu, Qiuyue Fan, Rui Pang, Fengshi Li, Zengai Chen, Zhenghong Wang, Weifeng Yu, Junying Yuan, Peiying Li
Summary: This study demonstrates that macrophage migration inhibitory factor (MIF) promotes endothelial cell (EC) death under inflammatory conditions, thus contributing to blood-brain barrier disruption.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Nanoscience & Nanotechnology
Claire Arneson, Xinjing Huang, Stephen R. Forrest
Summary: This study demonstrates a method for achieving tunable white light through the side-by-side positioning of monochromatic blue and yellow phosphorescent OLED stripes using a high-resolution mechanical peel-off patterning method. The results show a peak luminous power efficiency of 17.1 lm W-1 and an external quantum efficiency of 11.8%, as well as the ability to adjust the color temperature and color rendering index of the light source. The peel-off technique used in this method ensures a comparable device lifetime to conventionally patterned devices.
Review
Nanoscience & Nanotechnology
Yongxi Li, Xinjing Huang, Hafiz K. M. Sheriff Jr, Stephen R. Forrest
Summary: The narrow and intense absorption spectra of organic materials offer the possibility to develop efficient organic photovoltaic devices that are different from other solar cell technologies. By selectively absorbing light in specific ranges, these materials can be used for power-generating windows that are semitransparent in the visible range but absorb strongly in the ultraviolet and infrared regions, providing a sustainable solution for clean energy generation.
NATURE REVIEWS MATERIALS
(2023)
Article
Multidisciplinary Sciences
Yongxi Li, Xinjing Huang, Austin R. Mencke, Sunil Kumar Kandappa, Tonghui Wang, Kan Ding, Zuo-Quan Jiang, Aram Amassian, Liang-Sheng Liao, Mark E. Thompson, Stephen R. Forrest Abe
Summary: In order to improve the performance and lifetime of organic photovoltaic devices, precise control over the purity, composition, and structure of organic semiconductors is necessary. Ternary-blend organic photovoltaics have shown promise in improving solar spectral coverage and reducing energy losses. However, the blending process compromises the purity of the ternary blend, leading to impurities that affect device reproducibility and long-term reliability.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Multidisciplinary Sciences
Qiuyang Li, Adam Alfrey, Jiaqi Hu, Nathanial Lydick, Eunice Paik, Bin Liu, Haiping Sun, Yang Lu, Ruoyu Wang, Stephen Forrest, Hui Deng
Summary: A method based on 1-dodecanol encapsulation and gold-tape-assisted exfoliation is developed for the synthesis of large-area and high-quality transition metal dichalcogenide (TMD) monolayers. The encapsulated monolayers show uniform exciton energy, linewidth, and quantum yield over the whole area, and can be integrated with photonic crystal cavities to enhance light-matter coupling.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Boning Qu, Zhiyi Chen, Lucas Lahann, Stephen R. Forrest
Summary: White organic light emitting devices (WOLEDs) have advantages as solid state lighting sources, offering high energy efficiency, superior color quality, and a flexible, thin profile. Recent advances suggest that mass production of WOLED panels is approaching. This research estimates the cost of white WOLED panel production and predicts that with incremental costs reduction and improved luminance, WOLED lighting can be more affordable and suitable for various premium lighting applications.
Article
Physics, Applied
Jihun Lim, Stephen R. Forrest
Summary: Air-bridge thermophotovoltaic (ABTPV) devices achieve nearly 99% utilization of out-of-band (OOB) photons. The thermodynamic limit for single junction ABTPVs is determined to be 55.5% at an emitter temperature of 1400 K, compared to the reported efficiency of 32%. A technology computer-aided design model predicts that reducing surface-recombination velocity improves the efficiency limit to 48.6%. Free-carrier absorption and shadowing effects have been analyzed for their impact on TPV performance.
PHYSICAL REVIEW APPLIED
(2023)
Article
Chemistry, Physical
Jihun Lim, Bosun Roy-Layinde, Bin Liu, Andrej Lenert, Stephen R. Forrest
Summary: An air-bridge thermophotovoltaic (TPV) cell is demonstrated to achieve nearly complete utilization of out-of-band (OOB) photons. By using a flat In0.53Ga0.47As TPV membrane, the cell achieves an OOB reflectance (R (OOB)) of 98.9 +/- 0.1% under 1279 K blackbody illumination. The flat TPV cell exhibits improved spectral efficiency and power conversion efficiency compared to the buckled cell.
ACS ENERGY LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Bin Liu, Jason Lynch, Haonan Zhao, Ben R. Conran, Clifford McAleese, Deep Jariwala, Stephen R. Forrest
Summary: Atomically thin transition metal dichalcogenides (TMDs), a subclass of 2D layered materials, show promise as a platform for photonic and optoelectronic devices. This study demonstrates centimeter-scale monolayers of WS2 grown using metal-organic chemical vapor deposition, with polariton propagation lengths of up to 60 μm. The polaritons are formed through the coupling of excitons with Bloch surface waves (BSWs) supported by all-dielectric photonic structures. The results provide a practical approach for engineering long-range energy transport in TMD layers mediated by exciton-polaritons, enabling room temperature TMD-based polaritonic devices.
Correction
Multidisciplinary Sciences
Qiuyang Li, Adam Alfrey, Jiaqi Hu, Nathanial Lydick, Eunice Paik, Bin Liu, Haiping Sun, Yang Lu, Ruoyu Wang, Stephen Forrest, Hui Deng
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Boning Qu, Haonan Zhao, Stephen R. Forrest
Summary: A comprehensive numerical model is developed to quantitatively analyze the charge and exciton distributions in phosphorescent white organic light-emitting diodes (WOLEDs). The model is validated by direct measurement of the exciton distribution in monochromatic phosphorescent OLEDs and accurately predicts the intensity and current-dependent spectral shifts in complex, multilayer WOLEDs.
Article
Chemistry, Multidisciplinary
Xinjing Huang, Yongxi Li, Stephen R. Forrest
Summary: Blending dipolar NFA molecules in ternary organic photovoltaics (OPVs) reduces the operational stability due to the reorganization and reorientation of these molecules, which increases the dielectric constant of the bulk heterojunction (BHJ) and decreases the electric field, leading to a larger reduction in charge collection efficiency over time.
CELL REPORTS PHYSICAL SCIENCE
(2023)
