{"id":94755,"date":"2019-08-14T02:23:10","date_gmt":"2019-08-14T09:23:10","guid":{"rendered":"https:\/\/lifeboat.com\/blog\/2019\/08\/novel-invisibility-cloaks-for-water-waves-leave-no-telltale-wakes-or-drag"},"modified":"2019-08-14T02:23:10","modified_gmt":"2019-08-14T09:23:10","slug":"novel-invisibility-cloaks-for-water-waves-leave-no-telltale-wakes-or-drag","status":"publish","type":"post","link":"https:\/\/lifeboat.com\/blog\/2019\/08\/novel-invisibility-cloaks-for-water-waves-leave-no-telltale-wakes-or-drag","title":{"rendered":"Novel \u201cinvisibility cloaks\u201d for water waves leave no telltale wakes or drag"},"content":{"rendered":"<p><a class=\"aligncenter blog-photo\" href=\"https:\/\/lifeboat.com\/blog.images\/novel-invisibility-cloaks-for-water-waves-leave-no-telltale-wakes-or-drag.jpg\"><\/a><\/p>\n<p>Two separate teams of scientists have devised novel hydrodynamic \u201cinvisibility cloaks\u201d\u2014instead of shielding objects from light, the cloaks would shield them from fluid flows. The scientists described their work in two new papers in Physical Review Letters. These kinds of cloaking structures could one day help reduce drag on ships or submarines, or protect ships at a port or wharf from potential damage from strong waves.<\/p>\n<p>Most so-called \u201cinvisibility cloaks\u201d <a href=\"https:\/\/arstechnica.com\/science\/2019\/05\/study-says-ancient-romans-may-have-built-invisibility-cloaks-into-structures\/\">created thus far<\/a> work in the electromagnetic regime and rely on metamaterials. A \u201c<a href=\"https:\/\/en.wikipedia.org\/wiki\/History_of_metamaterials\">metamaterial<\/a>\u201d is any material <a href=\"https:\/\/skullsinthestars.com\/2013\/04\/25\/physics-demonstrations-cloaking-device\/\">whose microscopic structure<\/a> can bend light in ways light doesn\u2019t normally bend\u2014a property called \u201cthe index of refraction.\u201d Natural materials have a positive index of refraction; certain manmade metamaterials\u2014first <a href=\"https:\/\/www.webcitation.org\/5oJFbfeAD?url=http:\/\/people.ee.duke.edu\/~drsmith\/pubs_smith_group\/Smith_PRL_84_4184_(2000).pdf\">synthesized in the lab<\/a> in 2000\u2014have <a href=\"http:\/\/www.physicscentral.com\/explore\/action\/cloaking.cfm\">a <em>negative<\/em> index of refraction<\/a>, meaning they interact with light in such a way as to bend light around even very sharp angles.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Two separate teams of scientists have devised novel hydrodynamic \u201cinvisibility cloaks\u201d\u2014instead of shielding objects from light, the cloaks would shield them from fluid flows. The scientists described their work in two new papers in Physical Review Letters. These kinds of cloaking structures could one day help reduce drag on ships or submarines, or protect ships [\u2026]<\/p>\n","protected":false},"author":513,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1635],"tags":[],"class_list":["post-94755","post","type-post","status-publish","format-standard","hentry","category-materials"],"_links":{"self":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/94755","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/users\/513"}],"replies":[{"embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/comments?post=94755"}],"version-history":[{"count":0,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/posts\/94755\/revisions"}],"wp:attachment":[{"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/media?parent=94755"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/categories?post=94755"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lifeboat.com\/blog\/wp-json\/wp\/v2\/tags?post=94755"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}