Article
Physics, Applied
Hamidreza Taghvaee, Fu Liu, Ana Diaz-Rubio, Sergei Tretyakov
Summary: Breaking the diffraction limit on optical devices and achieving subwavelength focusing requires tailoring the evanescent spectrum of wave fields. This paper presents a feasible strategy based on the concepts of the perfect lens and power flow-conformal metasurfaces, allowing for subwavelength hotspot size in near-field focusing. The findings have potential applications in antennas, beam-shaping devices, nonradiative wireless power transfer systems, microscopy, and lithography.
PHYSICAL REVIEW APPLIED
(2023)
Article
Optics
Ran Ning, Dayong Wang, Lu Rong, Jie Zhao, Yunxin Wang, Shufeng Lin
Summary: This Letter proposes a binary diffractive lens for a scanning imaging system working at 278.6 GHz, which generates a converging beam with a waist diameter of 0.65 mm and achieves a lateral imaging resolution of 1 mm. This low-cost terahertz lens, constituted by concentric rings with different radii, is optimized by stimulated annealing algorithm and fabricated by three-dimensional printing. Compared with the conventional transmissive convex lens, it achieves higher resolution and enhanced imaging quality through a smaller focal spot of the illumination beam. This type of lens would promote terahertz imaging closer to practical applications such as nondestructive testing and other scenarios.
CHINESE OPTICS LETTERS
(2023)
Article
Engineering, Electrical & Electronic
Wenyi Shao, Qiang Chen
Summary: This paper proposes an all-dielectric surface focusing Mikaelian lens that achieves high-resolution focusing in the X- and Ka-band. The lens, made using 3D printing, is low-cost and exhibits excellent imaging performance in high-resolution microwave and millimeter-wave imaging, as demonstrated through numerical simulations and experiments.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2023)
Article
Biochemical Research Methods
Chunlei Jiang, Hangyu Yue, Bing Yan, Taiji Dong, Xiangyu Cui, Peng Chen, Zengbo Wang
Summary: The study demonstrated the use of yeast cells as imaging lenses, trapping and magnifying nanoscale objects using fiber-based optical trapping technique. Experimental results showed that yeast cells could clearly resolve 100 nm features on a Blu-ray disc.
BIOMEDICAL OPTICS EXPRESS
(2021)
Article
Engineering, Mechanical
Liuxian Zhao, Changquan Lai, Miao Yu
Summary: This paper proposes a novel gradient index (GRIN) structural lens based on the concept of generalized Luneburg lens (GLL). The lens achieves ultralong focusing by realizing double foci and localization of energy flow between the two focal spots. The lens consists of two concentric circular regions with varying thickness and refractive indices, which can be tailored for different applications.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Acoustics
Mengru Zhang, Jian Chen, Mu Chen, Zheng Fan
Summary: This paper presents a far-field enhanced-resolution underwater ultrasonic imaging technique based on a single-slit structured planar focusing lens, which significantly improves the performance of far-field ultrasonic imaging. The lens is cost effective and easy to fabricate, showing superior performance in terms of resolution enhancement and operational flexibility.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2022)
Article
Optics
Jie Xu, Changjun Min, Yuquan Zhang, Jielei Ni, Gengwei Cao, Qianyi Wei, Jianjun Yang, Xiaocong Yuan
Summary: In this study, a wide-field single-probe structured light microscopy (SPSLM) is proposed and built to image the ultrafast three-dimensional topography evolution induced by femtosecond (fs) lasers. The SPSLM achieves high-resolution imaging in both spatial and temporal domains by utilizing a single imaging frame and a structured probe pulse. The technology is of great significance for studying ultrafast dynamics in fields such as fs laser ablation and material science.
PHOTONICS RESEARCH
(2022)
Article
Chemistry, Analytical
Marco Boccaccio, Pasquale Rachiglia, Gian Piero Malfense Fierro, Giovanni Pio Pucillo, Michele Meo
Summary: This study presents a design of a holey-structured metamaterial lens to improve acousto-ultrasonic imaging using air-coupled transducers, leading to enhanced sensitivity and resolution in damage imaging.
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
Materials Science, Characterization & Testing
Srijan Datta, Lalita Upda
Summary: This paper presents a novel negative index metamaterial (NIM) lens imaging sensor system for subwavelength microwave nondestructive evaluation (NDE) using homodyne detection measurements. The system provides a simple, low-cost, and highly sensitive imaging solution that can overcome the diffraction-limited resolution at far-field working distances. The study demonstrates the unique focus-scanning capability of NIM lenses for target localization without complex tuning mechanisms.
NDT & E INTERNATIONAL
(2023)
Article
Optics
Yangyang Zhou, Jue Li, Wen Xiao, Huanyang Chen
Summary: This study introduces a generalized conformal Luneburg lens (GCLL) based on conformal transformation optics for achieving broadband achromatic and highly efficient quasi-far-field super-focusing. The lens has a relatively high numerical aperture and sub-diffraction-limited resolution, and it is designed using gradient metamaterials.
Article
Optics
Hui Duan, Minghui Wang, Xu Hu, Zhangyin Li, Meiling Jiang, Sicong Wang, Yaoyu Cao, Xiangping Li, Fei Qin
Summary: The supercritical lens has shown remarkable capability in achieving far-field sub-diffraction limited focusing through a modulated interference effect. A new aberration-compensated supercritical lens with a single-layer configuration is proposed and experimentally demonstrated. With a numerical aperture value of 0.63, this aberration-compensated supercritical lens achieves far-field sub-diffraction limited focusing within a 20 degrees field of view at a wavelength of λ = 633 nm.
Article
Engineering, Mechanical
Shin Hur, Hoyoon Jeon, Youngsoo Kim, Muhammad A. Shah, Jinsik Kim, Byung Chul Lee, Md. Anzan-Uz-Zaman
Summary: In this study, an acoustic metalens for underwater imaging was designed and the feasibility of subwavelength ultrasonic imaging was demonstrated. The proposed metalens is suitable for high-resolution ultrasound applications, such as biomedical and non-destructive imaging.
INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
(2022)
Article
Optics
Guangxing Wu, Yan Zhou, Minghui Hong
Summary: The optical microsphere nanoscope has the potential to be used in inspecting integrated circuit chips and characterizing morphology in biology. However, its resolution in ambient air is limited by the magnification and numerical aperture of the microsphere. To overcome this, high refractive index hyper-hemi-microspheres with tunable magnification were proposed and realized. Experimental results show that these hyper-hemi-microspheres have better imaging resolution and contrast compared to microspheres in air.
LIGHT-SCIENCE & APPLICATIONS
(2023)
Article
Acoustics
Yongxing Cai, Yongfeng Song, Peijun Ni, Xiling Liu, Xiongbing Li
Summary: A convolutional neural network that considers structural noise is developed for subwavelength ultrasonic imaging, distinguishing flaw echoes from noise, achieving great performance in imaging subwavelength flaws with an F1 score of 97.69%, without the need for preparing flaw echoes for training.
Article
Acoustics
Jose P. Leao-Neto, Mauricio Hoyos, Jean-Luc Aider, Glauber T. Silva
Summary: This article theoretically investigates the acoustic radiation force and torque on a small spheroidal particle in a nonviscous fluid inside an ideal cylindrical chamber. Analytical expressions for the radiation force and torque caused by an acoustic wave of arbitrary shape are presented, and the behavior of an elongated metallic microspheroid in a half-wavelength acoustofluidic chamber is analyzed. The results show alignment and translational motion effects on the microspheroid caused by the radiation torque and force.
JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA
(2021)
Article
Physics, Applied
Sebastian Zehnter, Marco A. B. Andrade, Christoph Ament
Summary: Most acoustic levitation techniques are limited to small objects, but recent advancements have allowed for the stable levitation of macroscopic objects using various models and algorithms. This research demonstrates the stable levitation of a macroscopic sphere through innovative methods, paving the way for efficient manipulation of macroscopic objects through superposition of holographic elements in future applications.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Rafael Morales, Inigo Ezcurdia, Josu Irisarri, Marco A. B. Andrade, Asier Marzo
Summary: Holographic methods adapted from optics to acoustics have potential for novel applications in particle manipulation or patterning by generating dynamic custom-tailored acoustic fields. Researchers introduced an iterative algorithm for calculating amplitudes and phases of ultrasound emitters, and used it to analyze the impact of emission resolution on resulting acoustic fields, along with presenting a hardware platform for acoustic hologram generation.
APPLIED SCIENCES-BASEL
(2021)
Article
Pharmacology & Pharmacy
Eduardo J. Barbosa, Marco A. B. Andrade, Mariana R. Gubitoso, Vinicius D. N. Bezzon, Pamela A. Smith, Stephen R. Byrn, Nadia A. Bou-Chacra, Flavio M. S. Carvalho, Gabriel L. B. de Araujo
Summary: The study utilized acoustic levitation and high-resolution synchrotron to quickly screen polymers, revealing that Plasdone (R) and Soluplus (R) have excellent properties for forming NCL amorphous dispersions. Results from this fast screening method showed good agreement with conventional solvent evaporation screening, indicating great potential for accelerating ASD formulation screening and analysis.
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(2021)
Article
Radiology, Nuclear Medicine & Medical Imaging
Luciana C. Cabrelli, Joao H. Uliana, Luismar B. da Cruz Junior, Luciano Bachmann, Antonio A. O. Carneiro, Theo Z. Pavan
Summary: The development of a wall-less vascular phantom for ultrasound and photoacoustic imaging was reported in this study. By manufacturing SEBS gel samples with different proportions of glycerol and TiO2, the optimal formulation was determined and the stability of the phantom during pulsatile blood-mimicking fluid flow was demonstrated.
BIOMEDICAL PHYSICS & ENGINEERING EXPRESS
(2021)
Article
Acoustics
Jose P. Leao-Neto, Everton B. de Lima, Joao Henrique Uliana, Theo Z. Pavan, Glauber T. Silva, Jose H. Lopes
Summary: This article reports the development and characterization of an ultrasonic transducer that can (super)focus ultrasonic waves beyond the diffraction limit. The transducer consists of an additive manufactured case, a circular flat piezoelectric actuator, and a core-shell lens. It is capable of resolving subwavelength structures and producing high-quality images.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2022)
Article
Pharmacology & Pharmacy
Yugo Araujo Martins, Theo Zeferino Pavan, Renata Fonseca Vianna Lopez
Summary: Sonodynamic therapy (SDT) is a new treatment method for noninvasive cancer treatment that combines ultrasound and sonosensitizer drugs. The experimental conditions and setups, such as frequency, intensity, and culture type, can significantly impact the SDT bioeffects/response. Different experimental setups may lead to variations in cytotoxicity and reactive oxygen species production, making in vitro to in vivo translation in SDT difficult. A well-designed in vitro experimental setup is crucial for understanding the interactions between biological medium, sonosensitizer, and ultrasound in SDT.
INTERNATIONAL JOURNAL OF PHARMACEUTICS
(2021)
Article
Chemistry, Physical
Geovana L. Santana, Murilo C. Crovace, Ernesto E. Mazon, Adilson J. A. de Oliveira, Theo Z. Pavan, Edgar D. Zanotto
Summary: Magnetic hyperthermia (MHT), a therapy that utilizes the heat generated by a magnetic material for cancer treatment, has great potential in bone cancer therapy. In this study, a smart composite material composed of an F18 bioactive glass matrix and different amounts of Lanthanum-Strontium Manganite (LSM) powder was developed. The addition of LSM improved the magnetic properties and heating ability of the composite, and also demonstrated in vitro bioactivity. The composites showed promising results in raising the temperature to 40°C, indicating their potential for use in bone cancer therapy.
Article
Chemistry, Multidisciplinary
Saeideh Arsalani, Soudabeh Arsalani, Mileni Isikawa, Eder J. Guidelli, Ernesto E. Mazon, Ana Paula Ramos, Andris Bakuzis, Theo Z. Pavan, Oswaldo Baffa, Antonio A. O. Carneiro
Summary: The development of nanomaterials has attracted attention in the field of nanomedicine for advancing cancer diagnosis and treatment over the past few decades. Gold nanorods and magnetic nanoparticles are commonly used nanostructures in biomedical applications due to their attractive optical properties and superparamagnetic behaviors, respectively. In this study, a simple combination of plasmonic and superparamagnetic properties was proposed by synthesizing hybrid nanoparticles of citrate-coated manganese ferrite and cetyltrimethylammonium bromide-coated gold nanorods.
Proceedings Paper
Acoustics
Silvio Vieira, Marco Andrade
Summary: Sound can levitate objects in air and water, allowing for handling cells, liquids, or compounds without touch or contamination. In this study, a piezoelectric transducer was designed and fabricated to assemble a single-axis acoustic levitator capable of levitating objects larger than the acoustic wavelength. The transducer successfully levitated a polyacetal disk in experimental tests.
2021 IEEE UFFC LATIN AMERICA ULTRASONICS SYMPOSIUM (LAUS)
(2021)
Proceedings Paper
Acoustics
Gutemberg da Silva Cardoso, Jose Pereira Leao-Neto, Jose Henrique Lopes
Summary: The subwavelength focused beams (SFB) generated by Ball-Shaped lens have been shown to be more sensitive and versatile for high-resolution applications when using Rexolite shell and fluid cores compared to metallic cores. This indicates the potential for greater adaptability and effectiveness in producing high resolution images.
2021 IEEE UFFC LATIN AMERICA ULTRASONICS SYMPOSIUM (LAUS)
(2021)
Proceedings Paper
Engineering, Industrial
Rogerio Y. Takimoto, Agesinaldo M. Silva Jr, Marcelo Y. Matuda, Timoteo F. Oliveira, Guilherme C. Duran, Julio C. Adamowski, Marcos S. G. Tsuzuki
Summary: This paper presents the quantification of submerged gases using ultrasonic and optical techniques, comparing and analyzing the results obtained from the two methods, considering factors such as image processing and the size and rate of bubbles.
2021 14TH IEEE INTERNATIONAL CONFERENCE ON INDUSTRY APPLICATIONS (INDUSCON)
(2021)