{"id":19927,"date":"2011-09-04T13:26:24","date_gmt":"2011-09-04T10:26:24","guid":{"rendered":"http:\/\/www.lovendal.net\/wp52\/?p=19927"},"modified":"2011-09-04T13:26:24","modified_gmt":"2011-09-04T10:26:24","slug":"stiinta-isi-arata-limitele-legile-reflexiei-si-refractiei-luminii-sunt-sfidate-intr-un-experiment-incredibil","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/stiinta-isi-arata-limitele-legile-reflexiei-si-refractiei-luminii-sunt-sfidate-intr-un-experiment-incredibil\/","title":{"rendered":"\u015etiin\u0163a \u00ee\u015fi arat\u0103 limitele: legile reflexiei \u015fi refrac\u0163iei luminii sunt sfidate \u00eentr-un experiment incredibil!"},"content":{"rendered":"<p><a href=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2011\/09\/noile-legi-ale-refractiei.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-19928\" title=\"noile legi ale refractiei\" src=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2011\/09\/noile-legi-ale-refractiei.jpg\" alt=\"\" width=\"304\" height=\"224\" srcset=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2011\/09\/noile-legi-ale-refractiei.jpg 304w, https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2011\/09\/noile-legi-ale-refractiei-300x221.jpg 300w\" sizes=\"auto, (max-width: 304px) 100vw, 304px\" \/><\/a>Exploat\u00e2nd o nou\u0103 tehnic\u0103 denumit\u0103 discontinuitatea fazic\u0103, cercet\u0103torii de la \u015ecoala de Inginerie \u015fi \u015etiin\u0163e Aplicate Harvard (SEAS) au reu\u015fit s\u0103 determine razele luminoase s\u0103 se comporte \u00eentr-un fel \u00een care sfideaz\u0103 legile reflexiei \u015fi refrac\u0163iei din fizica optic\u0103, vechi de secole \u00eentregi, scrie <a href=\"http:\/\/news.harvard.edu\/gazette\/story\/2011\/09\/from-a-flat-mirror-designer-light\/\" target=\"_blank\"><strong>Harvard Gazette<\/strong><\/a>. Descoperirea a dus la o reformulare a legilor matematice care prezic traiectoria unei raze de lumin\u0103 ce trece dintr-un mediu \u00een altul, de exemplu, din aer \u00een sticl\u0103.<\/p>\n<p><em>&#8222;Folosind suprafe\u0163e create, noi am creat efecte amuzante pe o oglind\u0103 cu o suprafa\u0163\u0103 plan\u0103&#8221;<\/em>, spune Federico Capasso, unul din principalii cercet\u0103tori. El a mai ad\u0103ugat c\u0103 <em>&#8222;descoperirea noastr\u0103 duce fizica optic\u0103 \u00eentr-un nou teritoriu \u015fi deschide u\u015file unor dezvolt\u0103ri uimitoare \u00een tehnologia fotonic\u0103&#8221;.<\/em><\/p>\n<p>\u00cenc\u0103 din vechi timpuri, se cuno\u015ftea foarte bine faptul c\u0103 lumina traverseaz\u0103 cu diferite viteze diferite medii. Reflec\u0163ia \u015fi refrac\u0163ia apar atunci c\u00e2nd lumina \u00eent\u00e2lne\u015fte un material la un anumit unghi, pentru c\u0103 o parte a razei e capabil\u0103 s\u0103 o ia \u00eenaintea celeilalte. Drept rezultat, unda din fa\u0163\u0103 \u00ee\u015fi schimb\u0103 direc\u0163ia. Legile conven\u0163ionale ale fizicii optice calculeaz\u0103 unghiurile de reflexie \u015fi de refrac\u0163ie, pe baza unghiului de inciden\u0163\u0103 \u015fi a propriet\u0103\u0163ilor celor dou\u0103 medii.<\/p>\n<p>\u00cen timp ce studiau comportamentul luminii pe suprafe\u0163e cu nanostructuri metalice, cercet\u0103torii \u015fi-au dat seama c\u0103 ecua\u0163iile obi\u015fnuite sunt insuficiente pentru a descrie bizarul fenomen observat \u00een laborator. Noile legi generalizate, demonstrate experimental la Harvard, iau \u00een considerare faptul c\u0103 grani\u0163a dintre dou\u0103 medii poate constitui ea \u00eens\u0103\u015fi un al treilea mediu.<\/p>\n<p><em>&#8222;\u00cen mod obi\u015fnuit, o suprafa\u0163\u0103 ca cea a unui lac constituie o grani\u0163\u0103 geometric\u0103 dintre dou\u0103 medii: aer \u015fi ap\u0103&#8221;,<\/em> a spus Nanfang Yu, cercet\u0103tor \u00een cadrul aceluia\u015fi proiect. <em>&#8222;Dar, \u00een acest caz special, grani\u0163a devine o interfa\u0163\u0103 activ\u0103, care poate \u015fi ea devia lumina&#8221;.<\/em><\/p>\n<p>Componenta cheie reprezint\u0103 un sistem de mici antene de aur gravate pe suprafa\u0163a unui silicon. Sistemul este mult mai sub\u0163ire dec\u00e2t lungimea de und\u0103 a luminii care o atinge. Aceasta \u00eenseamn\u0103 c\u0103, spre deosebire de sistemul optic conven\u0163ional, grani\u0163a dintre aer \u015fi silicon creeaz\u0103 o schimbare nea\u015fteptat\u0103 &#8211; denumit\u0103 &#8222;continuitate fazic\u0103&#8221; &#8211; asupra v\u00e2rfului razei de lumin\u0103 care o traverseaz\u0103. Fiecare anten\u0103 din sistem este un mic rezonator ce poate prinde lumina, \u0163in\u00e2ndu-i energia pentru o anumit\u0103 perioad\u0103 de timp \u00eenainte de a o elibera. Mai multe tipuri de rezonatori nanoscalici de pe suprafa\u0163a siliconului pot efectiv curba lumina \u00eenainte de a se propaga \u00een noul mediu. Rezultatul este c\u0103 legile reflexiei \u015fi refrac\u0163iei nu mai sunt valabile, razele de lumin\u0103 depinz\u00e2nd de modelul suprafe\u0163ei.<\/p>\n<p>P.S. Aceast\u0103 \u015ftire arat\u0103 \u00eenc\u0103 o dat\u0103 faptul c\u0103 \u015ftiin\u0163a este impotent\u0103. Ceea ce ne spune acum c\u0103 e adev\u0103rat, peste o anumit\u0103 perioad\u0103 de timp o s\u0103 ni se spun\u0103 contrariul, c\u0103 de fapt era gre\u015fit \u015fi c\u0103 alte legi guverneaz\u0103 materia. Niciodat\u0103 \u015ftiin\u0163a nu va ajunge la un adev\u0103r absolut, pentru c\u0103, pur \u015fi simplu, ea nu poate s\u0103 ofere mai mult dec\u00e2t ni\u015fte fr\u00e2nturi din adev\u0103r.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Exploat\u00e2nd o nou\u0103 tehnic\u0103 denumit\u0103 discontinuitatea fazic\u0103, cercet\u0103torii de la \u015ecoala de Inginerie \u015fi \u015etiin\u0163e Aplicate Harvard (SEAS) au reu\u015fit s\u0103 determine razele luminoase s\u0103 se comporte \u00eentr-un fel \u00een care sfideaz\u0103 legile reflexiei \u015fi refrac\u0163iei din fizica optic\u0103, vechi &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"\u015etiin\u0163a \u00ee\u015fi arat\u0103 limitele: legile reflexiei \u015fi refrac\u0163iei luminii sunt sfidate \u00eentr-un experiment incredibil!\" class=\"read-more button\" href=\"https:\/\/www.lovendal.ro\/wp52\/stiinta-isi-arata-limitele-legile-reflexiei-si-refractiei-luminii-sunt-sfidate-intr-un-experiment-incredibil\/#more-19927\" aria-label=\"Cite\u0219te mai multe despre \u015etiin\u0163a \u00ee\u015fi arat\u0103 limitele: legile reflexiei \u015fi refrac\u0163iei luminii sunt sfidate \u00eentr-un experiment incredibil!\">Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":19928,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[106],"tags":[348,952,4506,4507,2980,9803],"class_list":["post-19927","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-stiinta","tag-fizica","tag-lumina","tag-optica","tag-reflexie","tag-refractie","tag-stiinta","resize-featured-image"],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.3 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>\u015etiin\u0163a \u00ee\u015fi arat\u0103 limitele: legile reflexiei \u015fi refrac\u0163iei luminii sunt sfidate \u00eentr-un experiment incredibil! - Secretele lui Lovendal<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.lovendal.ro\/wp52\/stiinta-isi-arata-limitele-legile-reflexiei-si-refractiei-luminii-sunt-sfidate-intr-un-experiment-incredibil\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"\u015etiin\u0163a \u00ee\u015fi arat\u0103 limitele: legile reflexiei \u015fi refrac\u0163iei luminii sunt sfidate \u00eentr-un experiment incredibil!\" \/>\n<meta property=\"og:description\" content=\"Exploat\u00e2nd o nou\u0103 tehnic\u0103 denumit\u0103 discontinuitatea fazic\u0103, cercet\u0103torii de la \u015ecoala de Inginerie \u015fi \u015etiin\u0163e Aplicate Harvard (SEAS) au reu\u015fit s\u0103 determine razele luminoase s\u0103 se comporte \u00eentr-un fel \u00een care sfideaz\u0103 legile reflexiei \u015fi refrac\u0163iei din fizica optic\u0103, vechi ... 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