{"id":62332,"date":"2019-05-14T20:14:44","date_gmt":"2019-05-14T17:14:44","guid":{"rendered":"https:\/\/www.lovendal.ro\/wp52\/?p=62332"},"modified":"2019-05-14T20:14:44","modified_gmt":"2019-05-14T17:14:44","slug":"mantia-invizibila-din-harry-potter-devine-realitate-metamateriale-ce-incalca-legile-fizicii-pot-face-lucrurile-invizibile","status":"publish","type":"post","link":"https:\/\/www.lovendal.ro\/wp52\/mantia-invizibila-din-harry-potter-devine-realitate-metamateriale-ce-incalca-legile-fizicii-pot-face-lucrurile-invizibile\/","title":{"rendered":"Mantia invizibil\u0103 din &#8222;Harry Potter&#8221; devine realitate! Metamateriale ce \u00eencalc\u0103 legile fizicii pot face lucrurile invizibile&#8230;"},"content":{"rendered":"<p><a href=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2019\/05\/invizibilitate.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignleft size-full wp-image-62333\" src=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2019\/05\/invizibilitate.jpg\" alt=\"\" width=\"339\" height=\"297\" srcset=\"https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2019\/05\/invizibilitate.jpg 339w, https:\/\/www.lovendal.ro\/wp52\/wp-content\/uploads\/2019\/05\/invizibilitate-300x263.jpg 300w\" sizes=\"auto, (max-width: 339px) 100vw, 339px\" \/><\/a>\u00cen serialul SF &#8222;Star Trek&#8221;, cunoa\u015ftem despre navele klingoniene care au un \u201edispozitiv de ascundere\u201c secret care le face invizibile la lumin\u0103 sau radar. Cu ajutorul acestui dispozitiv, navele klingoniene se pot furi\u015fa \u00een spatele navelor Federa\u0163iei, surprinz\u00e2ndu-le \u00een ambuscad\u0103 \u015fi sc\u0103p\u00e2nd nepedepsite.<\/p>\n<p>Este un asemenea dispozitiv cu adevarat posibil? Invizibilitatea a fost mult\u0103 vreme una dintre minunile literaturii SF, \u00eencep\u00e2nd cu <em>&#8222;Omul invizibil&#8221;<\/em>, p\u00e2n\u0103 la mantia invizibil\u0103 din c\u0103r\u0163ile <em>&#8222;Harry Potter&#8221;<\/em>. Totu\u015fi, vreme de cel pu\u0163in un secol, fizicienii au respins posibilitatea unor mantii care s\u0103 confere invizibilitate purt\u0103torilor, declar\u00e2nd categoric c\u0103 acestea sunt imposibile. Ele violeaza legile opticii \u015fi nu se conformeaz\u0103 niciuneia dintre propriet\u0103\u0163ile cunoscute ale materiei. Dar ast\u0103zi, imposibilul ar putea deveni posibil. Noile progrese \u00een domeniul \u201emetamaterialelor\u201c oblig\u0103 la o revizuire drastic\u0103 a manualelor de optic\u0103.<\/p>\n<p>A\u015fadar, un nou material exotic numit \u201emetamaterial\u201c, care s-ar putea ca \u00eentr-o bun\u0103 zi, s\u0103 fac\u0103 obiectele cu adev\u0103rat invizibile. \u00cen mod ironic, crearea metamaterialelor a fost c\u00e2ndva considerat\u0103 imposibil\u0103 \u00eentruc\u00e2t acestea \u00eenc\u0103lcau legile opticii. Ce sunt metamaterialele? Sunt substan\u0163e care posed\u0103 propriet\u0103\u0163i optice care nu se g\u0103sesc \u00een natur\u0103. Metamaterialele sunt create prin plasarea unor implanturi minuscule \u00eentr-o substan\u0163\u0103 care for\u0163eaz\u0103 undele electromagnetice s\u0103 fie deviate \u00een moduri neobi\u015fnuite. De exemplu, la Universitatea Duke, oamenii de \u015ftiin\u0163\u0103 au \u00eencorporat circuite electrice minuscule \u00een ni\u015fte f\u00e2\u015fii de cupru aranjate \u00een cercuri plate, concentrice (\u00eentru c\u00e2tva asem\u0103n\u0103toare spiralelor unui cuptor electric). A rezultat un amestec sofisticat de ceramic\u0103, teflon, fibre compozite \u015fi componente metalice. Aceste implanturi \u00eenglobate \u00een cupru fac posibil\u0103 devierea \u015fi canalizarea parcursului radia\u0163iei din gama microundelor \u00eentr-un anume fel. G\u00e2ndi\u0163i-v\u0103 la modul cum un r\u00e2u \u00ee\u015fi croie\u015fte drum \u00een jurul unui bolovan. \u00centruc\u00e2t apa ocole\u015fte rapid bolovanul, prezen\u0163a bolovanului \u201ese pierde\u201c \u00een aval.<\/p>\n<p>\u00cen mod similar, metamaterialele pot modifica \u015fi devia continuu parcursul microundelor, astfel \u00eenc\u00e2t, de exemplu, s\u0103 ocoleasc\u0103 un cilindru, ceea ce, \u00een esen\u0163\u0103, determin\u0103 ca tot ce se afl\u0103 \u00een interiorul cilindrului s\u0103 fie invizibil la microunde. Dac\u0103 metamaterialul poate elimina \u00een totalitate reflexia \u015fi umbrele, atunci poate face ca obiectul s\u0103 fie complet invizibil pentru respectiva form\u0103 de radia\u0163ie.<\/p>\n<p>Oamenii de \u015ftiin\u0163\u0103 au demonstrat cu succes acest principiu cu ajutorul unui dispozitiv construit din zece inele din fibr\u0103 de sticl\u0103, acoperit cu elemente din cupru. Un inel din cupru \u00een interiorul dispozitivului a fost f\u0103cut aproape invizibil la microunde, arunc\u00e2nd doar o umbr\u0103 minuscul\u0103.<\/p>\n<p>Proprietatea esen\u0163ial\u0103 a metamaterialelor este capacitatea lor de a manipula ceva numit \u201eindice de refrac\u0163ie\u201c. Refrac\u0163ia este devierea pe care o sufer\u0103 lumina atunci c\u00e2nd str\u0103bate medii transparente. Dac\u0103 introduce\u0163i m\u00e2na \u00een ap\u0103 sau privi\u0163i prin lentilele ochelarilor, ve\u0163i observa c\u0103 apa \u015fi sticla distorsioneaz\u0103 \u015fi deviaz\u0103 calea luminii obi\u015fnuite. Motivul pentru care traiectoria luminii se modific\u0103 \u00een sticl\u0103 sau ap\u0103 este acela c\u0103 lumina \u00eencetine\u015fte la p\u0103trunderea \u00eentr-un mediu dens \u015fi transparent. Viteza luminii \u00een vid absolut r\u0103m\u00e2ne aceea\u015fi, dar lumina care str\u0103bate sticla sau apa trebuie s\u0103 treac\u0103 printre trilioane de atomi, ceea ce o \u00eencetine\u015fte.<\/p>\n<p>De obicei, indicele de refrac\u0163ie este constant. Un fascicul \u00eengust de lumin\u0103 este deviat atunci c\u00e2nd p\u0103trunde \u00een sticl\u0103, \u015fi apoi \u00ee\u015fi men\u0163ine traiectoria dreapt\u0103. Dar s\u0103 presupunem pentru un moment c\u0103 putem controla indicele de refrac\u0163ie dup\u0103 bunul plac, astfel \u00eenc\u00e2t s\u0103 se poat\u0103 schimba continuu \u00een fiecare punct din interiorul stratului de sticl\u0103. Pe m\u0103sur\u0103 ce str\u0103bate noul material, lumina poate fi deviat\u0103 \u015fi orientat\u0103 \u00een direc\u0163ii noi, cre\u00e2nd o traiectorie sinuoas\u0103 \u00een toat\u0103 substan\u0163a.<\/p>\n<p>Dac\u0103 se poate controla indicele de refrac\u0163ie din interiorul unui metamateriul, astfel \u00eenc\u00e2t lumina s\u0103 ocoleasc\u0103 un obiect, atunci respectivul obiect ar deveni invizibil. Pentru asta, metamaterialul \u00een cauz\u0103 trebuie s\u0103 aib\u0103 un indice de refrac\u0163ie negativ, despre care orice manual de optic\u0103 spune c\u0103 este imposibil.<\/p>\n<p>Metamaterialele sunt at\u00e2t de bizare \u015fi de absurde, \u00eenc\u00e2t au fost considerate odat\u0103 imposibil de ob\u0163inut. Dar \u00een ultimii c\u00e2\u0163iva ani, metamaterialele au fost efectiv realizate \u00een laborator, for\u0163\u00e2ndu-i pe fizicienii sceptici s\u0103 rescrie toate manualele de optic\u0103.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u00cen serialul SF &#8222;Star Trek&#8221;, cunoa\u015ftem despre navele klingoniene care au un \u201edispozitiv de ascundere\u201c secret care le face invizibile la lumin\u0103 sau radar. Cu ajutorul acestui dispozitiv, navele klingoniene se pot furi\u015fa \u00een spatele navelor Federa\u0163iei, surprinz\u00e2ndu-le \u00een ambuscad\u0103 &#8230; <\/p>\n<p class=\"read-more-container\"><a title=\"Mantia invizibil\u0103 din &#8222;Harry Potter&#8221; devine realitate! Metamateriale ce \u00eencalc\u0103 legile fizicii pot face lucrurile invizibile&#8230;\" class=\"read-more button\" href=\"https:\/\/www.lovendal.ro\/wp52\/mantia-invizibila-din-harry-potter-devine-realitate-metamateriale-ce-incalca-legile-fizicii-pot-face-lucrurile-invizibile\/#more-62332\" aria-label=\"Cite\u0219te mai multe despre Mantia invizibil\u0103 din &#8222;Harry Potter&#8221; devine realitate! Metamateriale ce \u00eencalc\u0103 legile fizicii pot face lucrurile invizibile&#8230;\">Cititi mai multe<\/a><\/p>\n","protected":false},"author":1,"featured_media":62333,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[11042],"tags":[601,346,8594,4514,260,11043,2086,717,8280,952,345,13572,3887,4389,4507,2174,3644,359,10092,2250],"class_list":["post-62332","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-fizica-chimie","tag-apa","tag-atomi","tag-bolovan","tag-cupru","tag-film","tag-fizica-chimie","tag-harry-potter","tag-inel","tag-invizibilitate","tag-lumina","tag-materie","tag-omul-invizibil","tag-radar","tag-radiatie","tag-reflexie","tag-sf","tag-star-trek","tag-sticla","tag-umbre","tag-universitate","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>Mantia invizibil\u0103 din &quot;Harry Potter&quot; devine realitate! Metamateriale ce \u00eencalc\u0103 legile fizicii pot face lucrurile invizibile... - 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\/mantia-invizibila-din-harry-potter-devine-realitate-metamateriale-ce-incalca-legile-fizicii-pot-face-lucrurile-invizibile\/\" \/>\n<meta property=\"og:locale\" content=\"ro_RO\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Mantia invizibil\u0103 din &quot;Harry Potter&quot; devine realitate! Metamateriale ce \u00eencalc\u0103 legile fizicii pot face lucrurile invizibile...\" \/>\n<meta property=\"og:description\" content=\"\u00cen serialul SF &#8222;Star Trek&#8221;, cunoa\u015ftem despre navele klingoniene care au un \u201edispozitiv de ascundere\u201c secret care le face invizibile la lumin\u0103 sau radar. 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Cu ajutorul acestui dispozitiv, navele klingoniene se pot furi\u015fa \u00een spatele navelor Federa\u0163iei, surprinz\u00e2ndu-le \u00een ambuscad\u0103 ... 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