• Current Optics and Photonics
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• 제1권4호
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• pp.396-401
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• 2017

In this article, we proposed hybrid polarization singularity configurations, based on the superposition of two orthogonal circularly polarized components, one of which is a light beam with two optical vortices. The topological configurations are the hybridization of lowest-order polarization singularities, but are different from high-order polarization singularities. Our numerical simulation may provide a theoretical basis for expanding the variety of polarization singularity configuration.

• Current Optics and Photonics
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• 제1권6호
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• pp.631-636
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• 2017

We firstly develop a straightforward method to generate full $Poincar{\acute{e}}$ beams with any polarization geometry over an arbitrary order $Poincar{\acute{e}}$ sphere. We implement this by coaxial superposition of two orthogonal circular polarized beams with alternative topological charges with the help of a Mach-Zehnder interferometer. Secondly we find the existence of singularity points. And the inner relationship between their characteristics and the order of $Poincar{\acute{e}}$ spheres is also studied. In summary, this work provides a convenient and effective way to generate vector beams and to control their polarization states.

• Journal of the Optical Society of Korea
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• 제19권4호
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• pp.397-402
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• 2015

In this paper, we propose a method used to measure the polarization state of a field with multiple polarization singularities (PSs), such as an array of PSs and PSs in vector speckle. A checkerboard is used to construct characteristic points, which makes it possible to calibrate the mismatches between pictures obtained during the rotation of a quarter-wave plate and a polarizer. Using this method a field with an array of PSs is measured. The experimental result is compared with the numerical simulation. We also carry out some data analysis. The comparison and analysis emphasize the necessity and feasibility of this method to measure the PSs.

• Journal of the Optical Society of Korea
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• 제20권1호
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• pp.192-198
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• 2016

The distributions of (or constraints for) amplitude and phase around C-points, including Lemon, Mon-Star and Star, are studied. A Cartesian coordinate system with origin at the C-point is established. Four curves, where the azimuthal angles of polarization ellipses are 0°, 45°, 90°, and 135° respectively, are used to determine the distributions. Discussions of these constraints illustrate why Mon-Star is rarer than Lemon or Star in experiments. The transformation relationships between these three polarization singularities (PSs) are also discussed. We construct suitable functions for amplitude and phase according to their constraints, and simulate several PSs of particular shapes. With the development of modulation techniques for amplitude and phase, it is clear that this work is helpful for generating arbitrarily shaped C-points in experiments.

• Journal of Magnetics
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• 제3권2호
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• pp.44-48
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• 1998

Scanning Electron Microscopy with Polarization Analysis (SEMPA) was used to image the surface magnetic domain structure of the 100 ${\mu}{\textrm}{m}$ thick 3% Si-Fe sheet. The thin-gauged 3% Si-Fe strips with magnetic induction ($B_{10}$) from 1.98 to 1.57 Tesla were prepared via conventional metallurgical processes including melting, hot-and cold-rolling, intermediate annealing and final annealing. Using SEMPA, it was observed that the $B_{10}$ (1.98 T) Tesla sample was almost composed of 180$^{\circ}$ stripe domains which are parallel to rolling direction. On the other hand the 3% Si-Fe sheet with $B_{10}$ (1.57 T) Tesla was composed of large 180$^{\circ}$stripe domains that are slanted about 30$^{\circ}$to the rolling direction and complex magnetic domain structures like tree and zigzag pattern. The 180$^{\circ}$stripe domains, which covered a major part of the sample, had (110)<001> Goss texture parallel to the rolling direction. The domain walls between 180$^{\circ}$stripe domains were the conventional Bloch type walls. On the other hand, the 90$^{\circ}$domains, which covered minor part on edge of the sample, were observed in (200) grains. The domain walls between 90$^{\circ}$domains were the Neel type walls. In high magnification, the elliptical singularity at the Neel walls was clearly observed.

• 정보화정책
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• 제23권4호
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• pp.24-37
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• 2016

지능정보사회는 정보가 중심이 되는 정보사회를 한 단계 넘어선 지능형 초연결사회를 의미한다. 인공지능이 구체적으로 논의되는 지금, 인공지능이 핵심적인 역할을 하는 지능정보사회의 대응을 위한 법 제도에 대한 논의를 시작해야할 때이다. 어느 순간 특이점을 넘어설 때는 너무 늦은 대응이 될 수 있기 때문이다. 물론, 인공지능이 우리 사회를 어떻게 변화시킬 지는 예측하기가 쉽지 않다. 다만, 고민스러운 것은 알고리즘이 세상을 지배하거나 적어도 의사결정의 지원을 하게될 지능정보사회에서 인간은 인공지능과 어떤 관계를 모색할 것인지 여부이다. 한 가지 분명한 것은 인공지능을 지배하거나, 또는 인공지능을 배제하는 것은 해결방안이 되기는 어렵다는 점이다. 인공지능이 중심에 서는 지능정보사회를 대응하기 위한 법제도적인 논의는 사람을 전제하는 현행 법제도를 인공지능으로 대체하는 수준까지 이뤄질 필요가 있다. 지능정보사회로의 패러다임 전환에 따른 법제 정비는 인공지능과 로봇, 그리고 사물이라는 새로운 객체의 출현과 그 객체의 주체화까지도 가정할 수 있기 때문이다.