18 papers · ranked by Valyu relevance
Haiyan Wang, Rafael Piestun
Diffractive optics have increasingly caught the attention of the scientific community. Classical diffractive optics are 2D diffractive optical elements (DOEs) and computer-generated holograms (CGHs), which modulate optical waves on a solitary transverse plane. However, potential capabilities are missed by the inherent…
Abel Zandamela, Nicola Marchetti, Adam Narbudowicz
—This work proposes an electrically small 3D beamforming antenna for PHYsical Layer (PHY-layer) security. The antenna comprises two layers of stacked patch structures, and is a five-mode five-port MIMO system operating around 1.85 GHz with electrical size ka = 0.98 and radiation efficiency of up to 55%. By studying the…
Takero Yoshida, Chang-Kyu Rheem
This paper presents a fundamental simulation method to generate synthetic aperture radar (SAR) images for moving ocean surfaces. We have designed the simulation based on motion induced modulations and Bragg scattering, which are important features of ocean SAR images. The time domain simulation is able to obtain time…
Nan-Shu Wu, Su Xu, Zuojia Wang, Hong‐Bo Sun
—Multidimensional modulation was widely studied in the past decades due to the explosive development of modern wireless communication. Here, we propose a spirally reconfigurable slotted antenna inspired by the multidimensional modulation. The amplitude, phase, and frequency-shift modulation are analog by integrating…
Suyi Zhong, Liang Qiao, Xichuan Ge, Xinzhu Xu + 7 more
Fluorescence polarization microscopy is widely used in biology for molecular orientation properties. However, due to the limited temporal resolution of single-molecule orientation localization microscopy and the limited orientation dimension of polarization modulation techniques, achieving simultaneous high…
Qingsong Yao, Zile Li, Guoxing Zheng
The ability to create complex three-dimensional structures of light is extremely challenging. Now, a technique combining Dammann optimization with metasurfaces has been developed, enabling control over all parameters, including polarization, phase, angular momentum, and spatial modes. The generation of…
Ashkan Azarfar, Nicolas Barbot, Etienne Perret
The directional amplitude backscatter modulation with suppressed Doppler is demonstrated based on the scattering from a symmetrically rotating resonant loop. The concept is studied theoretically and experimentally with perfectly compatible results. The symmetrical rotation of the scatterer and the effect of radial…
Chao Sun, Shiwen Yang, Yikai Chen, Jixin Guo + 1 more
Electromagnetic waves carrying orbital angular momentum (OAM) in radio frequency range have drawn great attention owing to its potential applications in increasing communication capacity. In this paper, both single-pole single-throw (SPST) switches and single-pole double-throw (SPDT) switches are designed and…
Stephen M. Town, W. Owen Brimijoin, Jennifer K. Bizley
A key function of the brain is to provide a stable representation of an object’s location in the world. In hearing, sound azimuth and elevation are encoded by neurons throughout the auditory system and auditory cortex is necessary for sound localization. However the coordinate frame in which neurons represent sound…
Dominik Pfennig, Andreas Albrecht, Julia Nowak, Peter Jomo Walla
In the past, different methods have been presented to determine the 3D orientation of single molecules in a microscopic set-up by excitation polarization modulation. Using linearly polarized illumination from different directions and thereby measuring different 2D projections enables reconstructing the full 3D…
Md Khadimul Islam, Arjuna Madanayake, Shubhendu Bhardwaj
—In this paper, we propose a method to generate Orbital Angular Momentum (OAM) carrying vortex waves inside a metallic circular waveguide (CW). These waves feature ability to carry multiple orthogonal modes at the same frequency, by the virtue of their unique spatial structure. In essence high data rate channels can be…
Zelin Zhu, Shilie Zheng, Xiaowen Xiong, Yuqi Chen + 3 more
'Xianbin Yu' 'Xianmin Zhang'] Abstract—Orbital angular momentum (OAM) has attracted great interest in the past few decades due to its helical phase characteristics. It has been proved that Plane spiral OAM (PSOAM) has potential in pattern reconfiguration of azimuthal domain because it solves the difficulty of mode…
Aleš Simončič, Andrej Hrovat, Grega Morano, Teodora Kocevska + 1 more
'Tomaž Javornik'] Abstract—Beam steering enables manipulation of the electromagnetic radiation patterns in antenna array systems. A methodology for steering beams in the near field of a planar antenna array with known phase wavefront functions towards arbitrary azimuth and elevation angles is described in this paper.…
Cezar-Ion Adomnitei, Cezar-Eduard Lesanu, Adrian Done, Ang Yu + 4 more
LEO satellite constellations can provide a viable alternative to expand connectivity to remote, isolated geographical areas and complement existing IoT terrestrial communication infrastructures. This paper aims to improve LEO satellite communications by implementing a new phased antenna array system that can…
Christiaan N. Hulleman, Rasmus Ø. Thorsen, Sjoerd Stallinga, Bernd Rieger
We have developed an engineered Point Spread Function (PSF) to enable the simultaneous estimation of dipole orientation, 3D position and degree of rotational constraint of single-molecule emitters from a single 2D focal plane. Besides giving access to orientation information, the Vortex PSF along with the vectorial PSF…
Authors not listed
Scope: I introduce a reproducible, closed-surface mapping of the periodic system onto a sphere with a single equatorial ring, yielding a symmetric alternative to 2D layouts. The construction partitions the sphere into belts that match the cardinalities of the s/p/d/f blocks (2/6/10/14), places lanthanoids and actinoids…
Ben Allen, Timothy D. Drysdale, Chris Stevens
We present the four-dimensional volumetric electromagnetic field measurements (x, y, z and frequency) of the complex radiated field produced by an 8-element circular antenna array. The array is designed to produce a Laguerre-Gauss (LG) mode l = +1 over the frequency range of 9-10 GHz. We evaluate our findings in terms…
Won Jin Choi, Gong Cheng, Zhengyu Huang, Shuai Zhang + 2 more
Terahertz circular dichroism (TCD) offers spectroscopic capabilities for understanding mesoscale chiral architecture and low-energy vibrations of macromolecules in (bio)materials^1–5^. However, the lack of dynamic polarization modulators comparable to polarization optics for other parts of electromagnetic spectrum…