نتایج جستجو برای: circular polarization

تعداد نتایج: 130407  

2017
Ruthanne Hassey Paradise Michael Barnes Michael Odoi Kevin Early JinHong Kim Michael D. Barnes

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2008
W. B. Sparks J. H. Hough L. Kolokolova T. Germer F. Chen S. DasSarma P. DasSarma F. Robb N. Manset I. N. Reid F. Duccio Macchetto William Martin

Biological molecules are optically active and exhibit homochirality. Therefore, it is possible that the scattering of light by biological molecules might result in a macroscopic signature in the form of circular polarization. If this is the case, then circular polarization spectroscopy, which may be utilized in remote sensing, can offer a powerful indicator of the presence of a universal biosig...

2017
Anthony F. Starace A. V. Flegel M. V. Frolov N. L. Manakov

We analyze the laser ellipticity dependence of n-photon differential cross sections (dσn/dΩ) for electron-atom scattering in an intense elliptically polarized laser field. We show that there exist two plateau-like structures in the dependence of dσn/dΩ on n for any ellipticity, including for the case of circular polarization. We present numerical predictions for e-H scattering in a CO2-laser fi...

1997
Francis F. Chen

By suitably adding rightand left-hand circularly polarized helicon waves in a cylinder, it is possible, in principle, to form linearly polarized modes, contrary to the notion that whistler waves must be circularly polarized. The plane-polarized component is accompanied by a left-hand circularly polarized component which vanishes on axis but becomes important at large radii. The field lines of t...

2016
F Mauger A D Bandrauk T Uzer

We investigate the process of circularly polarized high harmonic generation in molecules using a bicircular laser field. In this context, we show that molecules offer a very robust framework for the production of circularly polarized harmonics, provided their symmetry is compatible with that of the laser field. Using a discrete time-dependent symmetry analysis, we show how all the features (har...

Journal: :Physical review letters 2004
A S Green G A Gallup M A Rosenberry T J Gay

We have measured the circular polarization of light emitted from both atomic H and molecular H2 after bombarding H2 with longitudinally polarized electrons. For both atomic and molecular fluorescence near threshold we observe a circular polarization as great as 10% of the electron polarization. This represents the first direct observation of spin transfer in electron-molecule collisions.

2017
Yumi Takizawa Atsushi Fukasawa

This paper gives a novel structure of circular polarization antenna at the X-band. This antenna is made as plane antenna composed of a feedand a reactance-elements on a wide ground plate. The feed element is made by a circular disc cut linearly at the both sides along x-axis. The resonant frequencies are fH and fL along xand yaxes respectively. Degeneration is achieved by shifting the resonant ...

Journal: :Optics letters 2008
Amiel A Ishaaya Luat T Vuong Taylor D Grow Alexander L Gaeta

We investigate numerically and experimentally the spatial collapse dynamics and polarization stability of radially and azimuthally polarized vortex beams in pure Kerr medium. These beams are unstable to azimuthal modulation instabilities and break up into distinct collapsing filaments. The polarization of the filaments is primarily linear with weak circular components at the filaments' boundari...

2008
Takeshi Fukusako Ryo Sakami Kazuki Iwata

A novel type of circularly polarized broadband antenna consisting of a modified circular wideslot aperture and an L-shaped feed probe is introduced. The modified circular wide-slot is partially covered to generate circular polarization with broadband characteristics in the axial ratio. Variations in both the axial ratio and the S11 characteristics of the device are investigated and radiation pa...

2009
J. L. HAN A. G. LYNE

We report on polarimetric observations of 100 pulsars centered on 774 MHz, made using the Green Bank Telescope, presenting their polarization profiles and polarized flux densities and comparing them with previous observations when possible. For 67 pulsars, these are the first such measurements made. Polarization profiles of 8 millisecond pulsars in our sample show wide profiles and flat positio...

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