Investigation of Phase Singularity Problem in Microwave Breast Tomography
Journal of the Korean Institute of Electromagnetic Engineering and Science, 2014 This paper investigates the phase singularity problem in microwave image reconstruction utilizing unwrapped phase data. The measured phases of the electric fields in most microwave measurement systems are wrapped. Thus, a certain phase unwrapping process
Seong-Ho Son +2 more
exaly +2 more sources
Observation of photonic spin Hall effect with phase singularity at dielectric metasurfaces
Optics Express, 2015 Observation of photonic spin Hall effect (SHE) near the phase singularity at dielectric metasurfaces is presented. The structured metasurface works as a space-variant Pancharatnam-Berry phase element and produces a vortex beam with phase singularity. The
Ying Li, Yachao Liu, Xiaohui Ling
exaly +2 more sources
Singular Electromagnetics: From Phase Singularities to Optical Skyrmions and Beyond
Advanced Physics ResearchSingular electromagnetics, also known as singular optics in the visible spectrum, is a branch of modern electromagnetics/optics that studies the solutions with nontrivial topological features to Maxwell's equations under different boundary conditions ...
Jie Yang +3 more
doaj +3 more sources
Exploiting hidden singularity on the surface of the Poincaré sphere. [PDF]
Nat CommunThe classical Pancharatnam-Berry phase, a variant of the geometric phase, arises purely from the modulation of the polarization state of a light beam. Due to its dependence on polarization changes, it cannot be effectively utilized for wavefront shaping ...
Li J +5 more
europepmc +2 more sources
Ge2Sb2Te5‐Based Tunable Perfect Absorber Cavity with Phase Singularity at Visible Frequencies
Advanced Materials, 2018 Kandammathe Valiyaveedu Sreekanth +2 more
exaly +2 more sources
Phase Singularities to Polarization Singularities [PDF]
International Journal of Optics, 2020 Polarization singularities are superpositions of orbital angular momentum (OAM) states in orthogonal circular polarization basis. The intrinsic OAM of light beams arises due to the helical wavefronts of phase singularities. In phase singularities, circulating phase gradients and, in polarization singularities, circulating ϕ12 Stokes phase gradients are
null Ruchi +2 more
openaire +3 more sources
Direct observation of transfer of angular momentum to absorptive particles from a laser beam with a phase singularity. [PDF]
Physical Review Letters, 1995 Black or reflective particles can be trapped in the dark central minimum of a doughnut laser beam produced using a high efficiency computer generated hologram.
H. He +3 more
semanticscholar +2 more sources
Infinitesimal optical singularity ruler for three-dimensional picometric metrology
Nature CommunicationsOptical metrology with picometer-scale precision in three-dimensional space is of considerable importance in modern physics and state of the art technology, optical interference is an effective method, but techniques with rapid spatial variation have the
Haixiang Ma +6 more
doaj +2 more sources
Topological Charge of Multi-Color Optical Vortices
Photonics, 2022 The topological charge of an optical vortex is a quantity rather stable against phase distortions, for example, turbulence. This makes the topological charge attractive for optical communications, but for many structured beams it is unknown.
Victor Victorovich Kotlyar +3 more
doaj +1 more source
The logarithmic phase singularity in the inverted harmonic oscillator
AVS Quantum Science, 2022 A spacetime singularity is located at the center of a black hole and surrounded by an event horizon, separating spacetime into two disjunct regions: one of them accessible to an outside observer and one that is not.
Freyja Ullinger +2 more
semanticscholar +1 more source