Polarization dependence on downconversion emission angle: investigation of the ‘Migdall effect’ Radhika Rangarajan a , Alfred B. U’Ren b & Paul G. Kwiat a a Department of Physics , University of Illinois at Urbana-Champaign , 1110 W Green St., Urbana, IL 61801, USA b Instituto de Ciencias Nucleares, Universidad Nacional Autónoma de México , Apartado Postal 70–543, 04510 DF, Mexico City, Mexico ...

A new quad-quaternion model is herein established for an electromagnetic vector-sensor array, under which a multidimensional algebra-based direction-of-arrival (DOA) estimation algorithm, termed as quad-quaternion MUSIC (QQ-MUSIC), is proposed. This method provides DOA estimation (decoupled from polarization) by exploiting the orthogonality of the newly defined “quadquaternion” signal and noise...

The neutron polarization of the NG-C beamline at NIST Center for Neutron Research was measured as part aCORN beta decay experiment. transmission through a polarized 3He spin filter cell recorded while adiabatic fast passage (AFP) nuclear magnetic resonance (NMR) reversed direction in an eight-step sequence to account drifts. dependence on used calculate polarization. time dependent fit model wh...

Abstract: Inclination of the bias magnetization in a magnetooptic waveguide yields both nonreciprocal phase shifts and polarization conversion. This enables the design of unidirectional polarization converters, i.e. waveguides that switch between orthogonal polarizations for one direction of light propagation, but keep the polarization state for light propagating in the opposite direction. Simu...

In this paper, transmitter polarization optimization is firstly proposed to improve the accuracy of azimuth-elevation arrival angles estimation within MIMO electromagnetic vector-sensor array (EMVA). Minimizing of Cramér-Rao bound is used as cost function for the optimal design of transmitting signal polarization. Computer simulation results verify that the optimal polarization design provides ...

The observations indicate the existence of linear polarization in the hydrogen Hα spectral line observed during the solar flare events. This emission of polarized radiation is of the order of 5% and is usually explained as a consequence of collisions of hydrogen atoms with the beam of fast protons coming from coronal regions. This article presents a brief overview of the recent solar flare pola...

Observations of polarization toward nearby stars in the upwind direction made by Tinbergen (1982) are consistent with an origin associated with interstellar dust grains entrained in interstellar magnetic fields wrapped around the heliosphere nose. The region of maximum polarization is centered around ecliptic coordinates (λ,β) = (295,0), corresponding to (l,b) = (20,–21). The direction of maxim...

In this paper, we introduce the spatial polarimetric time-frequency distribution (SPTFD) as a platform to process nonstationary array signals with two orthogonal polarization components, such as horizontal and vertical. The use of dual polarization empowers the STFDs and improves the robustness of the respective signal and noise subspaces. With the additional polarimetric information, improved ...

This paper presents a method allowing a complete characterization of wave signals received on a vector-sensor array. The proposed technique is based on wavefields separation processing and on estimation of fundamental waves attributes as the state of polarization state and the direction of arrival. Estimation of these attributes is an important step in data processing for a wide range of applic...

This paper links the polarization-sensitive-array signal detection problem to the parallel factor (PARAFAC) model, which is an analysis tool rooted in psychometrics and chemometrics. Exploiting this link, it derives a deterministic PARAFAC signal detection algorithm. The proposed PARAFAC signal detection algorithm fully utilizes the polarization, spatial and temporal diversities, and supports s...