Results 11 to 20 of about 1,347 (193)

Bifocal Ultrasound Focusing Using Bi-Fresnel Zone Plate Lenses [PDF]

Sensors, 2020
In this work, we present a bifocal Fresnel zone plate (BiFZP) capable of generating focusing profiles with two different foci. The performance of the BiFZP is demonstrated in the ultrasound domain, with a very good agreement between the experimental ...
Sergio Pérez-López, José Miguel Fuster, Pilar Candelas, Daniel Tarrazó-Serrano, Sergio Castiñeira-Ibáñez, Constanza Rubio   +5 more
doaj   +3 more sources

Diffractive lenses for neutron techniques [PDF]

Scientific Reports
Many neutron techniques can greatly benefit from enhanced neutron lenses for focusing and imaging. In this work, we revisit the potential of diffractive optics for neutron beams, building on advanced high-resolution nano-lithography techniques developed ...
Mano raj Dhanalakshmi Veeraraj, Di Qu, Shuai Zhao, Peng Qi, Konstantins Jefimovs, Matteo Busi, Joachim Kohlbrecher, Christian David, Markus Strobl, Joan Vila-Comamala   +9 more
doaj   +2 more sources

Enhanced Terahertz Sensing via On-Chip Integration of Diffractive Optics with InGaAs Bow-Tie Detectors [PDF]

Sensors
The practical implementation of terahertz (THz) imaging and spectroscopic systems in real operational conditions requires them to be of a compact size, to have enhanced functionality, and to be user-friendly.
Karolis Redeckas, Vytautas Jakštas, Matas Bernatonis, Vincas Tamošiūnas, Gintaras Valušis, Linas Minkevičius   +5 more
doaj   +2 more sources

Optical elements for the extreme ultraviolet and soft X-ray range [PDF]

Biuletyn Wojskowej Akademii Technicznej, 2022
The article presents the physical basis and overview of optical elements for the rangeincluding extreme ultraviolet (EUV) and soft X-ray (SXR). The first chapter contains an introductionto the subject under review and physical fundamentals.
Martyna Wardzińska, Przemysław Wachulak   +1 more
doaj   +1 more source

Investigation of an Active Focusing Planar Piezoelectric Ultrasonic Transducer [PDF]

Sensors
Ultrasonic focusing transducers have broad prospects in advanced ultrasonic non-destructive testing fields. However, conventional focusing methods that use acoustic concave lenses can disrupt the acoustic impedance matching condition, thereby adversely ...
Qiao Wu, Bin You, Xu Zhang, Jun Tu
doaj   +2 more sources

More are better, but the details matter: combinations of multiple Fresnel zone plates for improved resolution and efficiency in X-ray microscopy. [PDF]

J Synchrotron Radiat, 2018
Fresnel zone plates used for X-ray nanofocusing face high-aspect-ratio nanofabrication challenges in combining narrow transverse features (for high spatial resolution) along with extended optical modulation along the X-ray beam direction (to improve ...
Li K, Jacobsen C.
europepmc   +2 more sources

Deployable Fresnel Zone Plate Antenna for CubeSats

IGARSS 2023 - 2023 IEEE International Geoscience and Remote Sensing Symposium, 2023
Earth observation satellite missions are becoming increasingly important and have been also boosted by the appearance of small satellites, affordable to small companies and universities. Technology miniaturization and the reduction in power consumption have been a key point in the reduction of the dimensions of these spacecrafts, being able to ...
Garcia Morilla, Alejandro, Márquez, A., Contreras Benito, Luis Juan, Gràcia i Solà, Guillem, Garcín, D., Blas, R., Rodríguez Suárez, A., Camps Carmona, Adriano José   +7 more
openaire   +1 more source

High-efficiency focusing and imaging by dielectric kinoform zone plate lenses with soft X-rays

Journal of Synchrotron Radiation, 2023
With fast advances in enhancing the focusing/imaging resolution of Fresnel zone plate lenses toward sub-10 nm, low diffraction efficiency in connection with their rectangular zone shape still remains a big issue in both soft and hard X-ray microscopy. In
Xujie Tong, Yifang Chen, Zijian Xu, Yijie Li, Zhenjiang Xing, Chengyang Mu, Jun Zhao, Xiangjun Zhen, Chengwen Mao, Renzhong Tai   +9 more
doaj   +1 more source

Multi-beam ptychography with coded in-line Fresnel zone plates [PDF]

, 2023
X-ray ptychography is often implemented for nanoimaging at synchrotron radiation sources and extensions are being developed to make experiments faster. This work is on multi-beam ptychography with Fresnel zone plates that have a small lateral separation,
Kahnt, Maik, Astrand, Mattias, Astrand, Mattias,, Johansson, Ulf,, Vogt, Ulrich, Johansson, Ulf, Kahnt, Maik,, Vogt, Ulrich,, Lund University.   +8 more
core   +1 more source

Investigation of Beam Width Shaping of a Ku-band Horn Antenna using a Diffractive Optic Element and an Electromagnetic Wave Absorber

Sakarya Üniversitesi Fen Bilimleri Enstitüsü Dergisi, 2020
The feasibility of beam-shaping of a Ku-Band horn as a transmitting (Tx) antenna by mounting two different versions of lenses which are kind of Fresnel Zone Plates (FZP) is studied.
Ahmet Teber
doaj   +1 more source