{"id":8178,"date":"2018-02-02T16:20:50","date_gmt":"2018-02-02T09:20:50","guid":{"rendered":"http:\/\/ttud.com.vn\/?p=8178"},"modified":"2018-02-02T16:20:50","modified_gmt":"2018-02-02T09:20:50","slug":"cac-nha-nghien-cuu-su-dung-song-am-thanh-de-cai-thien-he-thong-thong-tin-soi-quang","status":"publish","type":"post","link":"https:\/\/casta.ttud.com.vn\/index.php\/cac-nha-nghien-cuu-su-dung-song-am-thanh-de-cai-thien-he-thong-thong-tin-soi-quang\/","title":{"rendered":"C\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u s\u1eed d\u1ee5ng s\u00f3ng \u00e2m thanh \u0111\u1ec3 c\u1ea3i thi\u1ec7n h\u1ec7 th\u1ed1ng th\u00f4ng tin s\u1ee3i quang"},"content":{"rendered":"<p><img decoding=\"async\" class=\"aligncenter\" src=\"http:\/\/khoahocvacongnghevietnam.com.vn\/images\/stories\/thang-1-2018\/311-cac.jpg\" alt=\"311 cac\" \/><strong><br \/>\n<\/strong><\/p>\n<p>C\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u Illinois \u0111\u00e3 ch\u1ee9ng minh \u0111\u01b0\u1ee3c s\u00f3ng \u00e2m c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 s\u1ea3n xu\u1ea5t \u0111i\u1ed1t quang c\u1ef1c tr\u1ecb si\u00eau nh\u1ecf, \u0111\u1ee7 nh\u1ecf \u0111\u1ec3 t\u00edch h\u1ee3p v\u00e0o chip m\u00e1y t\u00ednh. C\u00e1c thi\u1ebft b\u1ecb n\u00e0y, \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 c\u00e1c b\u1ed9 c\u00e1ch ly quang h\u1ecdc, c\u00f3 th\u1ec3 gi\u00fap gi\u1ea3i quy\u1ebft c\u00e1c v\u1ea5n \u0111\u1ec1 l\u1edbn v\u1ec1 dung l\u01b0\u1ee3ng d\u1eef li\u1ec7u v\u00e0 th\u00e1ch th\u1ee9c v\u1ec1 k\u00edch c\u1ee1 h\u1ec7 th\u1ed1ng cho c\u00e1c m\u1ea1ch t\u00edch h\u1ee3p quang t\u1eed, t\u01b0\u01a1ng \u0111\u01b0\u01a1ng \u00e1nh s\u00e1ng c\u1ee7a c\u00e1c m\u1ea1ch \u0111i\u1ec7n t\u1eed, \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng cho m\u00e1y t\u00ednh v\u00e0 truy\u1ec1n th\u00f4ng.<\/p>\n<p>C\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u cho bi\u1ebft, b\u1ed9 c\u00e1ch ly l\u00e0 c\u00e1c thi\u1ebft b\u1ecb phi thu\u1eadn ngh\u1ecbch ho\u1eb7c l\u00e0 thi\u1ebft b\u1ecb &#8220;m\u1ed9t chi\u1ec1u&#8221;, n\u00f3 t\u01b0\u01a1ng t\u1ef1 nh\u01b0 \u0111i\u1ed1t \u0111i\u1ec7n t\u1eed. Ch\u00fang b\u1ea3o v\u1ec7 ngu\u1ed3n laser kh\u1ecfi ph\u1ea3n x\u1ea1 ng\u01b0\u1ee3c l\u1ea1i v\u00e0 l\u00e0 thi\u1ebft b\u1ecb r\u1ea5t c\u1ea7n thi\u1ebft cho vi\u1ec7c \u0111\u1ecbnh tuy\u1ebfn c\u00e1c t\u00edn hi\u1ec7u \u00e1nh s\u00e1ng xung quanh c\u00e1c m\u1ea1ng quang h\u1ecdc. Ng\u00e0y nay, c\u00f4ng ngh\u1ec7 ti\u00ean ti\u1ebfn d\u00f9ng \u0111\u1ec3 s\u1ea3n xu\u1ea5t c\u00e1c thi\u1ebft b\u1ecb phi thu\u1eadn ngh\u1ecbch n\u00e0y r\u1ea5t c\u1ea7n ph\u1ea3i c\u00f3 \u0111\u01b0\u1ee3c c\u00e1c v\u1eadt li\u1ec7u c\u00f3 kh\u1ea3 n\u0103ng bi\u1ebfn \u0111\u1ed5i t\u00ednh ch\u1ea5t quang h\u1ecdc c\u1ee7a ch\u00fang \u0111\u1ec3 \u0111\u00e1p \u1ee9ng v\u1edbi t\u1eeb tr\u01b0\u1eddng.<\/p>\n<p>Gi\u00e1o s\u01b0 k\u1ef9 thu\u1eadt v\u00e0 khoa h\u1ecdc c\u01a1 h\u1ecdc, v\u00e0 l\u00e0 \u0111\u1ed3ng t\u00e1c gi\u1ea3 c\u1ee7a nghi\u00ean c\u1ee9u, Gaurav Bahl cho bi\u1ebft: C\u00f3 m\u1ed9t s\u1ed1 v\u1ea5n \u0111\u1ec1 t\u1ed3n t\u1ea1i khi vi\u1ec7c \u1ee9ng d\u1ee5ng c\u00e1c v\u1eadt li\u1ec7u \u0111\u00e1p \u1ee9ng t\u1eeb tr\u01b0\u1eddng \u0111\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c m\u1ed9t lu\u1ed3ng \u00e1nh s\u00e1ng trong m\u1ed9t chip photonic \u0111\u00f3 l\u00e0: th\u1ee9 nh\u1ea5t, ng\u00e0nh c\u00f4ng nghi\u1ec7p kh\u00f4ng \u0111\u1ee7 kh\u1ea3 n\u0103ng \u0111\u1ec3 \u0111\u01b0a c\u00e1c nam ch\u00e2m g\u1ecdn nh\u1eb9 v\u00e0o trong chip, nh\u01b0ng quan tr\u1ecdng h\u01a1n l\u00e0, c\u00e1c v\u1eadt li\u1ec7u thi\u1ebft y\u1ebfu v\u1eabn kh\u00f4ng t\u1ea1o ra \u0111\u1ed9 h\u1eefu d\u1ee5ng trong c\u00e1c l\u00f2 \u0111\u00fac quang t\u1eed, \u0111\u00f3 l\u00e0 l\u00fd do t\u1ea1i sao ng\u00e0nh c\u00f4ng nghi\u1ec7p r\u1ea5t c\u1ea7n m\u1ed9t ph\u01b0\u01a1ng ph\u00e1p ti\u1ebfp c\u1eadn t\u1ed1t h\u01a1n m\u00e0 duy nh\u1ea5t ch\u1ec9 s\u1eed d\u1ee5ng c\u00e1c v\u1eadt li\u1ec7u th\u00f4ng th\u01b0\u1eddng v\u00e0 tr\u00e1nh \u0111\u01b0\u1ee3c to\u00e0n b\u1ed9 c\u00e1c t\u1eeb tr\u01b0\u1eddng.<\/p>\n<p>Trong m\u1ed9t nghi\u00ean c\u1ee9u \u0111\u0103ng tr\u00ean t\u1ea1p ch\u00ed Nature Photonics, c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u \u0111\u00e3 gi\u1ea3i th\u00edch c\u00e1ch th\u1ee9c h\u1ecd s\u1eed d\u1ee5ng c\u1eb7p \u0111\u00f4i k\u1ebft n\u1ed1i c\u00f3 k\u00edch c\u1ee1 r\u1ea5t nh\u1ecf n\u1eb1m \u1edf gi\u1eefa \u00e1nh s\u00e1ng v\u00e0 \u00e2m thanh \u0111\u1ec3 cung c\u1ea5p m\u1ed9t gi\u1ea3i ph\u00e1p duy nh\u1ea5t cho ph\u00e9p c\u00e1c thi\u1ebft b\u1ecb phi \u0111\u1ea3o ngh\u1ecbch v\u1edbi h\u1ea7u h\u1ebft c\u00e1c v\u1eadt li\u1ec7u quang t\u1eed. Tuy nhi\u00ean, k\u00edch th\u01b0\u1edbc v\u1eadt l\u00fd c\u1ee7a thi\u1ebft b\u1ecb v\u00e0 s\u1ef1 s\u1eb5n c\u00f3 c\u1ee7a v\u1eadt li\u1ec7u kh\u00f4ng ph\u1ea3i l\u00e0 v\u1ea5n \u0111\u1ec1 duy nh\u1ea5t v\u1edbi c\u00e1c thi\u1ebft b\u1ecb hi\u1ec7n \u0111\u1ea1i hi\u1ec7n nay, c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u cho bi\u1ebft.<\/p>\n<p>T\u00e1c gi\u1ea3 ch\u00ednh c\u1ee7a nghi\u00ean c\u1ee9u, Benjamin Sohn, cho bi\u1ebft r\u1eb1ng: Nh\u1eefng n\u1ed7 l\u1ef1c trong ph\u00f2ng th\u00ed nghi\u1ec7m \u0111\u1ec3 t\u1ea1o ra c\u00e1c b\u1ed9 c\u00e1ch ly quang c\u00f3 t\u1eeb t\u00ednh lu\u00f4n b\u1ecb c\u1ea3n tr\u1edf b\u1edfi s\u1ef1 m\u1ea5t m\u00e1t quang h\u1ecdc l\u1edbn. Ng\u00e0nh c\u00f4ng nghi\u1ec7p quang t\u1eed kh\u00f4ng c\u00f3 \u0111\u1ee7 kh\u1ea3 n\u0103ng \u0111\u1ec3 kh\u1eafc ph\u1ee5c \u0111\u01b0\u1ee3c nh\u1eefng t\u1ed5n th\u1ea5t c\u00f3 li\u00ean quan \u0111\u1ebfn v\u1eadt li\u1ec7u n\u00e0y v\u00e0 c\u0169ng kh\u00f4ng c\u1ea7n c\u00f3 m\u1ed9t gi\u1ea3i ph\u00e1p cung c\u1ea5p \u0111\u1ee7 b\u0103ng th\u00f4ng \u0111\u1ec3 c\u00f3 th\u1ec3 so s\u00e1nh \u0111\u01b0\u1ee3c v\u1edbi k\u1ef9 thu\u1eadt t\u1eeb tr\u01b0\u1eddng truy\u1ec1n th\u1ed1ng. Cho t\u1edbi nay, kh\u00f4ng c\u00f3 c\u00e1ch ti\u1ebfp c\u1eadn magnetless n\u00e0o \u0111\u1ec3 c\u1ea1nh tranh so s\u00e1nh.<\/p>\n<p>Thi\u1ebft b\u1ecb m\u1edbi \u0111\u01b0\u1ee3c t\u1ea1o ra m\u1edbi \u0111\u00e2y c\u00f3 k\u00edch th\u01b0\u1edbc ch\u1ec9 kho\u1ea3ng 200 microns &#8211; kho\u1ea3ng 10.000 l\u1ea7n nh\u1ecf h\u01a1n m\u1ed9t centimet vu\u00f4ng &#8211; v\u00e0 \u0111\u01b0\u1ee3c l\u00e0m b\u1eb1ng nh\u00f4m nitrit, m\u1ed9t v\u1eadt li\u1ec7u trong su\u1ed1t truy\u1ec1n \u00e1nh s\u00e1ng v\u00e0 t\u01b0\u01a1ng th\u00edch v\u1edbi c\u00e1c ph\u00f4i quang t\u1eed.<\/p>\n<p>C\u00e1c s\u00f3ng \u00e2m \u0111\u01b0\u1ee3c s\u1ea3n xu\u1ea5t theo m\u1ed9t c\u00e1ch t\u01b0\u01a1ng t\u1ef1 nh\u01b0 m\u1ed9t loa \u00e1p \u0111i\u1ec7n, s\u1eed d\u1ee5ng c\u00e1c \u0111i\u1ec7n c\u1ef1c nh\u1ecf \u0111\u01b0\u1ee3c ghi tr\u1ef1c ti\u1ebfp l\u00ean nitr\u01a1 nh\u00f4m v\u1edbi ch\u00f9m \u0111i\u1ec7n t\u1eed. Nh\u1eefng s\u00f3ng \u00e2m thanh n\u00e0y \u00e9p \u00e1nh s\u00e1ng b\u00ean trong thi\u1ebft b\u1ecb ch\u1ec9 \u0111\u01b0\u1ee3c di chuy\u1ec3n theo m\u1ed9t h\u01b0\u1edbng. \u0110\u00e2y l\u00e0 l\u1ea7n \u0111\u1ea7u ti\u00ean m\u00e0 thi\u1ebft b\u1ecb c\u00e1ch \u0111i\u1ec7n \u00edt nam ch\u00e2m c\u00f3 \u0111\u1eb7c t\u00ednh v\u01b0\u1ee3t tr\u1ed9i h\u01a1n b\u0103ng th\u00f4ng gigahertz, Sohn n\u00f3i.<\/p>\n<p>C\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u \u0111ang t\u00ecm c\u00e1ch \u0111\u1ec3 t\u0103ng b\u0103ng th\u00f4ng ho\u1eb7c dung l\u01b0\u1ee3ng d\u1eef li\u1ec7u c\u1ee7a c\u00e1c thi\u1ebft b\u1ecb c\u00e1ch ly n\u00e0y v\u00e0 h\u1ecd tin ch\u1eafc r\u1eb1ng ch\u00fang c\u00f3 th\u1ec3 v\u01b0\u1ee3t qua c\u00e1c tr\u1edf ng\u1ea1i hi\u1ec7n nay. Sau khi ho\u00e0n thi\u1ec7n, h\u1ecd m\u01b0\u1eddng t\u01b0\u1ee3ng \u0111\u1ebfn c\u00e1c \u1ee9ng d\u1ee5ng thay \u0111\u1ed5i trong c\u00e1c h\u1ec7 th\u1ed1ng truy\u1ec1n th\u00f4ng quang t\u1eed, k\u00ednh ng\u1eafm, h\u1ec7 th\u1ed1ng GPS, c\u00e1c trung t\u00e2m d\u1eef li\u1ec7u v\u00e0 ch\u1ea5m c\u00f4ng nguy\u00ean t\u1eed.<\/p>\n<p>C\u00e1c trung t\u00e2m d\u1eef li\u1ec7u x\u1eed l\u00fd c\u00e1c l\u01b0\u1ee3ng l\u01b0u l\u01b0\u1ee3ng c\u1ee7a d\u1eef li\u1ec7u Internet r\u1ea5t l\u1edbn v\u00e0 ti\u00eau th\u1ee5 m\u1ed9t l\u01b0\u1ee3ng \u0111i\u1ec7n l\u1edbn \u0111\u1ec3 k\u1ebft n\u1ed1i v\u00e0 \u0111\u1ec3 l\u00e0m m\u00e1t cho c\u00e1c m\u00e1y ch\u1ee7. Th\u00f4ng tin truy\u1ec1n \u0111i tr\u00ean c\u01a1 s\u1edf \u00e1nh s\u00e1ng l\u00e0 \u0111i\u1ec1u c\u1ea7n thi\u1ebft b\u1edfi v\u00ec n\u00f3 sinh \u00edt nhi\u1ec7t h\u01a1n, ngh\u0129a l\u00e0 m\u1ea5t \u00edt n\u0103ng l\u01b0\u1ee3ng h\u01a1n khi l\u00e0m m\u00e1t m\u00e1y ch\u1ee7 trong qu\u00e1 tr\u00ecnh truy\u1ec1n d\u1eef li\u1ec7u, Bahl chia s\u1ebb.<\/p>\n<p>Ngo\u00e0i ti\u1ec1m n\u0103ng c\u00f4ng ngh\u1ec7, c\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u kh\u00f4ng th\u1ec3 c\u00f3 \u0111\u01b0\u1ee3c c\u00e1c gi\u1ea3i ph\u00e1p h\u1eefu \u00edch n\u00e0o nh\u01b0ng h\u1ecd \u0111\u00e3 b\u1ecb m\u00ea ho\u1eb7c b\u1edfi n\u1ec1n khoa h\u1ecdc c\u01a1 b\u1ea3n \u0111\u1eb1ng sau s\u1ef1 ti\u1ebfn b\u1ed9 n\u00e0y.<\/p>\n<p>Trong cu\u1ed9c s\u1ed1ng h\u00e0ng ng\u00e0y, ch\u00fang ta kh\u00f4ng nh\u00ecn th\u1ea5y s\u1ef1 t\u01b0\u01a1ng t\u00e1c c\u1ee7a \u00e1nh s\u00e1ng v\u1edbi \u00e2m thanh. Nghi\u00ean c\u1ee9u c\u1ee7a ch\u00fang t\u00f4i cho th\u1ea5y r\u1eb1ng \u00e1nh s\u00e1ng v\u00e0 \u00e2m thanh th\u1ef1c s\u1ef1 t\u01b0\u01a1ng t\u00e1c m\u1ed9t c\u00e1ch r\u1ea5t tinh t\u1ebf. N\u1ebfu b\u1ea1n \u00e1p d\u1ee5ng c\u00e1c nguy\u00ean l\u00fd \u0111\u00fang \u0111\u1eafn, b\u1ea1n c\u00f3 th\u1ec3 n\u1eafm b\u1eaft minh b\u1ea1ch th\u00f4ng tin v\u1eadt li\u1ec7u \u0111\u00fang c\u00e1ch \u0111\u1ec3 n\u00e2ng cao hi\u1ec7u qu\u1ea3 v\u00e0 gi\u1ea3i quy\u1ebft nh\u1eefng th\u00e1ch th\u1ee9c khoa h\u1ecdc quan tr\u1ecdng n\u00e0y, Bahl n\u00f3i.<\/p>\n<p style=\"text-align: right;\"><em>(NASATI)<\/em><\/p>\n","protected":false},"excerpt":{"rendered":"<p>C\u00e1c nh\u00e0 nghi\u00ean c\u1ee9u Illinois \u0111\u00e3 ch\u1ee9ng minh \u0111\u01b0\u1ee3c s\u00f3ng \u00e2m c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 s\u1ea3n xu\u1ea5t \u0111i\u1ed1t quang c\u1ef1c tr\u1ecb si\u00eau nh\u1ecf, \u0111\u1ee7 nh\u1ecf \u0111\u1ec3 t\u00edch h\u1ee3p v\u00e0o chip m\u00e1y t\u00ednh. C\u00e1c thi\u1ebft b\u1ecb n\u00e0y, \u0111\u01b0\u1ee3c g\u1ecdi l\u00e0 c\u00e1c b\u1ed9 c\u00e1ch ly quang h\u1ecdc, c\u00f3 th\u1ec3 gi\u00fap gi\u1ea3i quy\u1ebft c\u00e1c v\u1ea5n \u0111\u1ec1 [&hellip;]<\/p>\n","protected":false},"author":18,"featured_media":8179,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[47],"tags":[],"class_list":["post-8178","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tin-tuc"],"_links":{"self":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts\/8178","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/users\/18"}],"replies":[{"embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/comments?post=8178"}],"version-history":[{"count":1,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts\/8178\/revisions"}],"predecessor-version":[{"id":8180,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/posts\/8178\/revisions\/8180"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/media\/8179"}],"wp:attachment":[{"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/media?parent=8178"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/categories?post=8178"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/casta.ttud.com.vn\/index.php\/wp-json\/wp\/v2\/tags?post=8178"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}