3 research outputs found
Broadband laser polarization control with aligned carbon nanotubes
We introduce a simple approach to fabricate aligned carbon nanotube (ACNT)
device for broadband polarization control in fiber laser systems. The ACNT
device was fabricated by pulling from as-fabricated vertically-aligned carbon
nanotube arrays. Their anisotropic property is confirmed with optical and
scanning electron microscopy, and with polarized Raman and absorption
spectroscopy. The device was then integrated into fiber laser systems (at two
technologically important wavelengths of 1 and 1.5 um) for polarization
control. We obtained a linearly-polarized light output with the maximum
extinction ratio of ~12 dB. The output polarization direction could be fully
controlled by the ACNT alignment direction in both lasers. To the best of our
knowledge, this is the first time that ACNT device is applied to polarization
control in laser systems. Our results exhibit that the ACNT device is a simple,
low-cost, and broadband polarizer to control laser polarization dynamics, for
various photonic applications (such as material processing, polarization
diversity detection in communications), where the linear polarization control
is necessary.Comment: 5 pages, 6 figure
Heritability and genomics of gene expression in peripheral blood
Item does not contain fulltextWe assessed gene expression profiles in 2,752 twins, using a classic twin design to quantify expression heritability and quantitative trait loci (eQTLs) in peripheral blood. The most highly heritable genes (similar to 777) were grouped into distinct expression clusters, enriched in gene-poor regions, associated with specific gene function or ontology classes, and strongly associated with disease designation. The design enabled a comparison of twin-based heritability to estimates based on dizygotic identity-by-descent sharing and distant genetic relatedness. Consideration of sampling variation suggests that previous heritability estimates have been upwardly biased. Genotyping of 2,494 twins enabled powerful identification of eQTLs, which we further examined in a replication set of 1,895 unrelated subjects. A large number of non-redundant local eQTLs (6,756) met replication criteria, whereas a relatively small number of distant eQTLs (165) met quality control and replication standards. Our results provide a new resource toward understanding the genetic control of transcription.8 p