Catálogo de publicaciones - revistas

<jats:title>Miniaturized optical ranging and tracking</jats:title> <jats:p> Light detection and ranging systems are used in many engineering and environmental sensing applications. Their relatively large size and cost, however, tend to be prohibitive for general use in autonomous vehicles and drones. Suh and Vahala and Trocha <jats:italic>et al.</jats:italic> show that optical frequency combs generated by microresonator devices can be used for precision ranging and the tracking of fast-moving objects. The compact size of the microresonators could broaden the scope for widespread applications, providing a platform for miniaturized laser ranging systems suitable for photonic integration. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6378" page="884" related-article-type="in-this-issue" vol="359" xlink:href="10.1126/science.aao1968">884</jats:related-article> , p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6378" page="887" related-article-type="in-this-issue" vol="359" xlink:href="10.1126/science.aao3924">887</jats:related-article> </jats:p>

<jats:title>Miniaturized optical ranging and tracking</jats:title> <jats:p> Light detection and ranging systems are used in many engineering and environmental sensing applications. Their relatively large size and cost, however, tend to be prohibitive for general use in autonomous vehicles and drones. Suh and Vahala and Trocha <jats:italic>et al.</jats:italic> show that optical frequency combs generated by microresonator devices can be used for precision ranging and the tracking of fast-moving objects. The compact size of the microresonators could broaden the scope for widespread applications, providing a platform for miniaturized laser ranging systems suitable for photonic integration. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6378" page="884" related-article-type="in-this-issue" vol="359" xlink:href="10.1126/science.aao1968">884</jats:related-article> , p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6378" page="887" related-article-type="in-this-issue" vol="359" xlink:href="10.1126/science.aao3924">887</jats:related-article> </jats:p>

<jats:title>Patterning a hyperbolic metasurface</jats:title> <jats:p> Structured metasurfaces potentially enable the control of the propagation direction of excitations on the material's surface. However, the high losses associated with the materials used to date has led to relatively short lifetimes for the excitations. Li <jats:italic>et al.</jats:italic> patterned a subwavelength grating into a layer of hexagonal boron nitride (hBN) and found that the lifetime and propagation length of the excitations could be much longer. Direct imaging of the polariton excitations illustrates that hBN can be a viable platform for nanophotonic circuits. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6378" page="892" related-article-type="in-this-issue" vol="359" xlink:href="10.1126/science.aaq1704">892</jats:related-article> </jats:p>

<jats:title>Boron learns to give back to nitrogen</jats:title> <jats:p> Although diatomic nitrogen is famously inert, a variety of transition metals can bind to it through a process termed backbonding. As the nitrogen weakly shares its own electrons, some electrons from the metal reach back out to it. Nonmetals would not seem to have the capacity for this type of bonding, but now Légaré <jats:italic>et al.</jats:italic> show that conventionally electron-deficient boron can be coaxed into it (see the Perspective by Broere and Holland). The authors treated boron-based precursors with potassium under a nitrogen atmosphere to produce several compounds with sandwiched dinitrogen between two boron centers in reduced motifs reminiscent of metal complexes. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6378" page="896" related-article-type="in-this-issue" vol="359" xlink:href="10.1126/science.aaq1684">896</jats:related-article> ; see also p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6378" page="871" related-article-type="in-this-issue" vol="359" xlink:href="10.1126/science.aar7395">871</jats:related-article> </jats:p>

<jats:title> CO <jats:sub>2</jats:sub> escaped from the deep </jats:title> <jats:p> Why did the concentration of atmospheric carbon dioxide rise so much and so quickly during the last deglaciation? Evidence has begun to accumulate suggesting that old, carbon-rich water accumulated at depth in the Southern Ocean, which then released its charge when Southern Ocean stratification broke down as the climate there warmed. Basak <jats:italic>et al.</jats:italic> present measurements of neodymium isotopes that clearly show that the deepwater column of the glacial southern South Pacific was stratified, just as would be necessary for the accumulation of old, carbon-rich water. Their data also show that North Atlantic processes were not the dominant control on Southern Ocean water-mass structure during that interval, as has been thought. </jats:p> <jats:p> <jats:italic>Science</jats:italic> , this issue p. <jats:related-article xmlns:xlink="http://www.w3.org/1999/xlink" ext-link-type="doi" issue="6378" page="900" related-article-type="in-this-issue" vol="359" xlink:href="10.1126/science.aao2473">900</jats:related-article> </jats:p>