Journal ArticleDOI
Polarization-based spatial filtering for directional and nondirectional edge enhancement using an S-waveplate
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TLDR
It is shown that either isotropic or anisotropic edge enhancement in any desired orientation can be performed by operating the same spatial filter setup in different illuminating polarization states.Abstract:
Using polarization as an additional parameter apart from amplitude and phase in spatial filtering experiments offers additional advantages and possibilities. An S-waveplate that can convert a linearly polarized light into radially or azimuthally polarized light can also be used for isotropic edge enhancement. For anisotropic edge enhancement, introduction of a polarizer at the output was recommended and edge selection was done by orientation of the polarizer. But the full potential of the S-waveplate as a spatial filter has not been exploited so far. Unlike the standard amplitude and phase-based Fourier filters, which are independent to the state of polarization of the illuminating beam, the S-waveplate acts in a different way depending on the state of polarization. The edge selection does not need to be carried out by changing the orientation of the polarizer. With a fixed polarizer at the output, we show that either isotropic or anisotropic edge enhancement in any desired orientation can be performed by operating the same spatial filter setup in different illuminating polarization states.read more
Citations
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Roadmap of Terahertz Imaging 2021.
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Phase Singularities to Polarization Singularities
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Recognition of polarization and phase states of light based on the interaction of non-uniformly polarized laser beams with singular phase structures.
TL;DR: This work proposes to analyze the polarization and phase states of laser beams using a fixed set of non-polarizing phase elements using multi-order phase-diffractive optical elements to uniquely determine the order of the vortex singularity and the cylindrical polarization of the laser beam.
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Polarization singularity index sign inversion by a half-wave plate.
TL;DR: It is shown that a half-wave plate (HWP) can be used for polarization singularity index sign inversion and the result presented here is powerful, and it shows the importance of a HWP in the study of polarization singularities.
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Full Poincaré beam with all the Stokes vortices.
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References
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Journal ArticleDOI
Optical spin-to-orbital angular momentum conversion in inhomogeneous anisotropic media
TL;DR: An optical process in which the spin angular momentum carried by a circularly polarized light beam is converted into orbital angular momentum, leading to the generation of helical modes with a wave-front helicity controlled by the input polarization is demonstrated.
Journal ArticleDOI
A Dual Role of Graphene Oxide Sheet Deposition on Titanate Nanowire Scaffolds for Osteo-implantation: Mechanical Hardener and Surface Activity Regulator
Wenjun Dong,Wenjun Dong,Lijuan Hou,Tingting Li,Ziqiang Gong,Huandi Huang,Ge Wang,Xiaobo Chen,Xiaoyun Li +8 more
TL;DR: In vitro cell culture tests suggest that the GO/titanate nanowire scaffolds act as a promising biomaterial candidate, in particular the one terminated with -OH groups, which demonstrates improved cell viability, and proliferation, differentiation and osteogenic activities.
PatentDOI
Spiral phase contrast imaging in microscopy
TL;DR: An optical method for edge contrast enhancement in light microscopy based on holographic Fourier plane filtering of the microscopic image with a spiral phase element displayed as an off-axis hologram at a computer controlled high resolution spatial light modulator (SLM) in the optical imaging pathway.
Journal ArticleDOI
Whole Genome Phylogeny of Bacillus by Feature Frequency Profiles (FFP)
Aisuo Wang,Gavin Ash +1 more
TL;DR: Fifty complete Bacillus genome sequences and associated plasmids were compared using the “feature frequency profile” (FFP) method and the resulting whole-genome phylogeny supports the placement of three Bacillus species as a single clade.
Journal ArticleDOI
Polarization pattern of vector vortex beams generated by q-plates with different topological charges
Filippo Cardano,Ebrahim Karimi,Sergei Slussarenko,Lorenzo Marrucci,Corrado de Lisio,Enrico Santamato +5 more
TL;DR: In this paper, the polarization topology of the vector beams emerging from a patterned birefringent liquid crystal plate with a topological charge q at its center (q-plate) is described.