Article
Multidisciplinary Sciences
Shivasubramanian Gopinath, Andrei Bleahu, Tauno Kahro, Aravind Simon John Francis Rajeswary, Ravi Kumar, Kaupo Kukli, Aile Tamm, Joseph Rosen, Vijayakumar Anand
Summary: Fresnel incoherent correlation holography (FINCH) is a well-established technique that uses diffractive lenses to modulate light and create a self-interference hologram for image reconstruction. A novel computational algorithm called transport of amplitude into phase (TAP-GSA) based on the Gerchberg-Saxton algorithm was developed to design multiplexed phase masks with high light throughput and low reconstruction noise. The new method shows significant improvements in power efficiency compared to random multiplexing and polarization multiplexing.
SCIENTIFIC REPORTS
(2023)
Article
Optics
S. E. B. A. S. T. I. A. N. Lin, Uwe d. Zeitner
Summary: Conventional design methods for computer-generated holograms often use scalar diffraction theory due to the high calculation effort of rigorous simulations. However, when dealing with sub-wavelength lateral feature sizes or large deflection angles, the performance of realized elements deviates from scalar behavior. To overcome this issue, we propose a new design method that incorporates high-speed semi-rigorous simulation techniques, allowing accurate modeling of light propagation. This method also solves the inverse problem of calculating a geometric structure for a specific physical field distribution.
Article
Materials Science, Multidisciplinary
Zhi Chen, Yongbo Hu, Xu He, Tianning Xiao, Limei Hao, Ying Ruan
Summary: A phase-field crystal model is introduced to study morphological transitions in the presence of a cubic term, leading to comprehensive pattern formation with stripe, triangular, and liquid phases. By combining with an amplitude phase-field crystal model, steady solutions of amplitudes and wave numbers can be easily obtained, exploring the convergence between growth morphology and size domain. The results indicate the importance of the cubic term parameter on crystalline phases, especially the triangular phase, in 2D phase diagrams, and different crystal shapes can be obtained by manipulating the point on the 2D phase diagram. Additionally, the method can be extended to study competition growth of multiple grains on larger computational domains and other solidification microstructures.
MATERIALS TODAY COMMUNICATIONS
(2021)
Article
Optics
F. Haddadan, M. Soroosh
Summary: In this paper, a plasmonic waveguide with a sandwiched SiO2 channel between a graphene layer and a silicon ridge is designed. By adjusting the chemical potential of graphene, low propagation loss is achieved. Furthermore, a 4-to-2 plasmonic priority encoder is proposed, which shows good contrast ratio and cross-talk at the working wavelength, with a relatively small area suitable for optical integrated circuits.
OPTICS AND LASER TECHNOLOGY
(2023)
Article
Physics, Applied
Noe Jimenez, Joao Ealo, Ruben D. Muelas-Hurtado, Aroune Duclos, Vicent Romero-Garcia
Summary: Acoustic vortices with subwavelength dimensions and tunable topological charge are synthesized using self-demodulation at distances far beyond the Rayleigh diffraction length, paving the way for applications in long-range communication, biomedical, and wave-matter interactions. The technique involves generating dual helical acoustic sources to produce primary confocal vortex beams and then exploiting nonlinear wave mixing to create self-demodulated vortex beams with unique properties.
PHYSICAL REVIEW APPLIED
(2021)
Article
Optics
Rui Wang, Futai Hu, Yuan Meng, Mali Gong, Qiang Liu
Summary: Optical bistability allows various optical nonlinear functions similar to electrical switches, logic gates, and memory. Free-space bistable devices have advantages in large-scale integration, but existing schemes have limitations in contrast ratio, compatibility, speed, and size. Epsilon-near-zero (ENZ) materials show ultrafast and giant optical nonlinearity, potentially overcoming these obstacles. Using indium-doped cadmium oxide as ENZ material, we demonstrate two efficient schemes for high-contrast optical bistability in deep subwavelength size based on ENZ and Berreman modes. Our work contributes to compact and ultra-fast all-optical signal processing.
Article
Engineering, Electrical & Electronic
Weifeng Jiang, Shuangye Xu
Summary: The experimental demonstration of mode-splitting through metamaterial engineering of bridged subwavelength gratings (BSWGs) shows promising results for optical communications and interconnects. The designed device, fabricated using CMOS-compatible processes, exhibits low insertion losses and mode crosstalks, making it a potential candidate for mode manipulation in MDM systems.
JOURNAL OF LIGHTWAVE TECHNOLOGY
(2021)
Article
Computer Science, Information Systems
Rui Wang, Dashuang Liao, Feng Yang
Summary: In this work, a simple and effective technique for widening the beamwidth of an antipodal linearly tapered slot antenna (ALTSA) is proposed and experimentally verified. By printing two rows of subwavelength metallic elements on the dielectric substrate of a general ALTSA, a quasi-hemispherical radiation pattern can be achieved without increasing the overall size and structural complexity. This method provides a good choice for wide-beam antenna design and has potential applications in wide-area wireless communication systems.
Article
Computer Science, Interdisciplinary Applications
Matteo Bruggi, Hussein Ismail, Janos Logo, Ingrid Paoletti
Summary: A multi-scale approach of topology optimization is proposed for designing lightweight components with given loads and displacement limits. The method utilizes hexagonal close-packed arrangements of circular/spherical holes to define microstructures that affect the macroscopic elastic properties. The proposed method has great potential and can be implemented using additive manufacturing techniques.
COMPUTERS & STRUCTURES
(2022)
Article
Materials Science, Multidisciplinary
Arun Jaiswal, Sweta Rani, Gaurav Pratap Singh, Sumit Saxena, Shobha Shukla
Summary: Two-photon lithography is a crucial tool for additive manufacturing of 2D and 3D micro/nanostructures in metal-polymer composite resins with resolutions beyond the diffraction limit. The formulation of two-photon polymerizable metal doped resin has been reported, allowing for precise fabrication of metal doped micro/nanostructures. This technique has the potential to revolutionize additive manufacturing of metal-dielectric composite structures and contribute to advancements in areas such as metaphotonics and plasmonic metamaterials.
Article
Nanoscience & Nanotechnology
Shuto Kozaka, Rie Wakabayashi, Noriho Kamiya, Masahiro Goto
Summary: Lipidic cubic phase (LCP) is a self-assembled system composed of lipids with interpenetrated aqueous channels, and its potential in drug delivery systems has been investigated. This study demonstrates that swollen LCP (SLCP) with larger aqueous channels can enhance the diffusion and skin penetration of peptides and proteins compared to regular LCP, providing an effective strategy for designing LCP systems for transcutaneous delivery of biomacromolecules.
ACS APPLIED MATERIALS & INTERFACES
(2021)
Article
Materials Science, Multidisciplinary
Quentin Hanniet, Eddy Petit, Sylvie Calas-Etienne, Pascal Etienne, Karim Aissou, Christel Gervais, Philippe Miele, Benoit Charlot, Chrystelle Salameh
Summary: Non-oxide ceramic MEMS based on Si, C, N and B elements are important for high-temperature applications. However, structuring and patterning ceramics is challenging. In this study, SiBCN ceramic micro-components were designed for the first time using direct patterning of UV-curable boron-modified polyvinylsilazane resins. The microstructures showed good mechanical properties and have potential applications in MEMS.
MATERIALS & DESIGN
(2022)
Article
Materials Science, Ceramics
Chun Luo, Jiayi Zheng, Miao Jiang, Lihong Gao, Zhuang Ma, Alexandr A. Rogachev
Summary: In this study, the phase transition temperature of Ba2SmTaO6 was confirmed to be 533 K, and the preparation process of different phases of Ba2-xSrxSmTaO6 was discovered. The reflectance of different phase structures of Ba2-xSrxSmTaO6 was characterized, revealing its potential application in optical sensors.
CERAMICS INTERNATIONAL
(2023)
Article
Chemistry, Physical
Rachel S. Hendley, Lechuan Zhang, Michael A. Bevan
Summary: This study demonstrates the assembly of different shaped colloidal particles into ordered microstructures using a two-dimensional AC electric field. By controlling particle shape and field conditions, various liquid crystal structures and crystals can be assembled. These findings provide design rules for the assembly of diverse microstructures in AC electric fields and could have implications for particle-based materials, display technologies, and printing technologies.
Article
Optics
Junpei Sano, Yasuhiro Takaki
Summary: This paper presents a holographic image generation technique for contact lens displays that can generate 3D images and provide see-through capability. A bench-top experimental system was constructed to verify the far-distance image generation capability and see-through function.
