{"id":1866,"date":"2026-09-07T06:00:00","date_gmt":"2026-09-06T21:00:00","guid":{"rendered":"https:\/\/onepress.co.kr\/index.php\/briefing\/2026-09-07-terahertz-shadow-phase-en\/"},"modified":"2026-09-07T06:00:00","modified_gmt":"2026-09-06T21:00:00","slug":"2026-09-07-terahertz-shadow-phase-en","status":"publish","type":"briefing","link":"https:\/\/onepress.co.kr\/index.php\/briefing\/2026-09-07-terahertz-shadow-phase-en\/","title":{"rendered":"A terahertz wave\u2019s shadow was used to reconstruct its phase"},"content":{"rendered":"<p><strong>2026-09-07 06:00 KST<\/strong><\/p>\n<p>An international team reconstructed terahertz-wave phase from the asymmetric shadow pattern formed around an object\u2019s edge. Published in Optics Express on September 2, the demonstration points to thickness and refractive-index imaging without a conventional interferometer.<\/p>\n<p>It does not immediately replace hospital or security scanners. The principle was shown in a constrained optical setup with single-pixel detection; speed, noise and complex materials still need testing.<\/p>\n<h2>Intensity versus phase<\/h2>\n<p>Intensity resembles brightness; phase records a wave\u2019s advance or delay. Material can change phase even when absorption is weak.<\/p>\n<h2>How did the shadow work?<\/h2>\n<p>A spiral-phase filter in a 4f system makes edge enhancement depend on input phase. A model inverted one intensity pattern into a phase map.<\/p>\n<figure class=\"wp-block-image size-full\"><img decoding=\"async\" src=\"https:\/\/onepress.co.kr\/wp-content\/uploads\/2026\/09\/terahertz-shadow-phase-en.png\" alt=\"A terahertz wave\u2019s shadow was used to reconstruct its phase\" loading=\"lazy\" \/><figcaption class=\"op-briefing-image-caption\">This AI-generated image explains the topic; it is not a photograph of the actual event, observation, or experiment.<\/figcaption><\/figure>\n<h2>What changes from existing tools?<\/h2>\n<p>Interferometers compare a reference wave and THz-TDS records a time waveform. The new route may simplify hardware, but equal accuracy and versatility are not yet established.<\/p>\n<h2>Possible uses<\/h2>\n<p>Added phase could reveal thin layers and refractive-index differences in nondestructive testing, material analysis and biological measurement.<\/p>\n<h2>What comes next?<\/h2>\n<p>Tests must cover varied materials, complex shapes, real-time speed, low-signal error, cost and stability over a wider field of view.<\/p>\n<h2>Primary sources and independent checks<\/h2>\n<p><a href=\"https:\/\/doi.org\/10.1364\/OE.610381\" target=\"_blank\" rel=\"noopener noreferrer\">Optics Express \uc6d0 \ub17c\ubb38<\/a><\/p>\n<p><a href=\"https:\/\/www.sci.tohoku.ac.jp\/news\/20260904-14605.html\" target=\"_blank\" rel=\"noopener noreferrer\">\ub3c4\ud638\ucfe0\ub300 \uacf5\uc2dd \ubc1c\ud45c<\/a><\/p>\n<p><a href=\"https:\/\/www.cn.chiba-u.jp\/news\/0904_thz\/\" target=\"_blank\" rel=\"noopener noreferrer\">\uc9c0\ubc14\ub300 \ub3c5\ub9bd \uae30\uad00 \ud655\uc778<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Researchers reconstructed terahertz phase from an asymmetric shadow-like intensity image without an interferometer. It is a laboratory demonstration, not a ready medical scanner.<\/p>\n","protected":false},"featured_media":0,"template":"","meta":[],"class_list":["post-1866","briefing","type-briefing","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/onepress.co.kr\/index.php\/wp-json\/wp\/v2\/briefing\/1866","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/onepress.co.kr\/index.php\/wp-json\/wp\/v2\/briefing"}],"about":[{"href":"https:\/\/onepress.co.kr\/index.php\/wp-json\/wp\/v2\/types\/briefing"}],"wp:attachment":[{"href":"https:\/\/onepress.co.kr\/index.php\/wp-json\/wp\/v2\/media?parent=1866"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}