Results 271 to 280 of about 80,934 (296)
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Conversion of keratometer readings to polar values
Journal of Cataract and Refractive Surgery, 1990Corneal astigmatism is a complex entity that has direction and magnitude. This study reports a new method to describe corneal astigmatism within the with- and against-the-rule concept. Each net astigmatism of the maximal power M in the meridian alpha may be divided into two dioptric components: a with-the-rule astigmatism projected on the 90-degree ...
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Asymmetric Polarization Conversion in Polarization Holograms with Surface Relief
Japanese Journal of Applied Physics, 2008We have developed holographic gratings that enable the asymmetric polarization conversion between ±1-order diffraction beams. The holographic gratings are formed by polarization holography in a poly[(methyl methacrylate)-co-(disperse yellow 7 methacrylate)] film and show both anisotropic phase and surface modulations.
Akira Emoto +2 more
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Polarity of localised conversion in Streptococcus pneumoniae transformation
Molecular and General Genetics MGG, 1987Localised conversion in pneumococcal transformation is a process that spans a few nucleotides when the 5'-ATTAAT/3'-TAAGTA configuration occurs at the pairing step. It was first observed in two-point crosses between an amiA mutation (amiA36) carrying this sequence and other closely linked mutants of the locus.
P, Mostachfi, A M, Sicard
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Polarity Conversion of Conjugated Polymer for Lysosome Escaping
ACS Applied Materials & Interfaces, 2017Polymers are mostly trapped in lysosomes when they enter cells and are then expelled, otherwise they were designed to be degradable to small molecules or to sabotage lysosomes. Therefore, they have reached the limit of the unique functionalities as a whole.
Lingyun Zhou +3 more
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Nonlinear polarization conversion using microring resonators
Optics Letters, 2007We present a design of a polarization converter between linear, circular, and elliptic accomplished with an on-chip high-Q dielectric microring resonator. Nonlinear polarization switching can be accomplished at modest input intensities because of the high-intensity compression in the ring.
Chris, Fietz, Gennady, Shvets
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Journal of Lightwave Technology, 2018
Polarization converter is firstly proposed with the functions of simultaneously converting a linear polarization (LP) and a circular polarization (CP) to its corresponding cross polarizations, and polarization conversion ratio (PCR) of the converter with graphene strips is also controllable in this paper.
Lin Peng +3 more
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Polarization converter is firstly proposed with the functions of simultaneously converting a linear polarization (LP) and a circular polarization (CP) to its corresponding cross polarizations, and polarization conversion ratio (PCR) of the converter with graphene strips is also controllable in this paper.
Lin Peng +3 more
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Metamaterials for Enhanced Polarization Conversion in Plasmonic Excitation
ACS Nano, 2011Surface plasmons efficient excitation is typically expected to be strongly constrained to transverse magnetic (TM) polarized incidence, as demonstrated so far, due to its intrinsic TM polarization. We report a designer plasmonic metamaterial that is engineered in a deep subwavelength scale in visible optical frequencies to overcome this fundamental ...
Feng, Liang +5 more
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Polarization conversion by reflection in a thin-film grating
Journal of the Optical Society of America A, 2001A dielectric-film waveguide with a grating etched on its film-cover interface can be used as a polarization converter. The e wave can be converted into the h wave and vice versa if the guided wave is incident obliquely to the grating vector. The polarization converter is analyzed by use of a quasi-optic technique.
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Polarization Conversion for Specular Components of Surface Reflection
IEEE Geoscience and Remote Sensing Letters, 2013Certain characteristics of a material such as the surface reflectivities can be determined even without knowledge of its internal properties. In this letter, a direct relationship (Azzam relationship) and an analytical approximation (Azzam-Sohn-Hong (ASH) approximation) between the vertically and horizontally polarized reflectivities of specular ...
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