{"id":2335,"date":"2026-03-25T13:57:21","date_gmt":"2026-03-25T13:57:21","guid":{"rendered":"https:\/\/wp.optics.arizona.edu\/jsu\/?p=2335"},"modified":"2026-08-03T15:28:36","modified_gmt":"2026-08-03T15:28:36","slug":"free-space-coupled-frequency-locked-microtoroid-resonators-for-ultrasensitive-gas-phase-detection","status":"publish","type":"post","link":"https:\/\/wp.optics.arizona.edu\/jsu\/free-space-coupled-frequency-locked-microtoroid-resonators-for-ultrasensitive-gas-phase-detection\/","title":{"rendered":"Free-Space\u2013Coupled Frequency-Locked Microtoroid Resonators for Ultrasensitive Gas-Phase Detection"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"2335\" class=\"elementor elementor-2335\">\n\t\t\t\t<div class=\"elementor-element elementor-element-25697ce1 e-flex e-con-boxed e-con e-parent\" data-id=\"25697ce1\" data-element_type=\"container\" data-e-type=\"container\">\n\t\t\t\t\t<div class=\"e-con-inner\">\n\t\t\t\t<div class=\"elementor-element elementor-element-1d9d05b8 elementor-widget elementor-widget-text-editor\" data-id=\"1d9d05b8\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t<p>Happy to share our latest paper in Laser &amp; Photonics Reviews.<br \/>We demonstrate free-space\u2013coupled, frequency-locked microtoroid resonators for gas sensing\u2014overcoming the long-standing limitation of fragile fiber tapers and moving WGM sensors closer to real-world use.<br \/>We accomplished:<br \/>\u2022 25 ppt detection limit at room temperature<br \/>\u2022 &gt;10\u2077 Q factors preserved after polymer coating<br \/>\u2022 3 orders of magnitude improvement over prior work<br \/>\u2022 Compact, robust, and capable of long-duration, unattended sensing<br \/>Using a mustard gas simulant (2-CEES), we show that ultrahigh sensitivity and real-world robustness can coexist.<br \/>This is the first demonstration of free-space\u2013coupled WGM microtoroids for chemical sensing, opening new opportunities in defense, security, and environmental monitoring.<br \/>Thanks to our excellent collaborators and generous sponsors.<\/p><p><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/full\/10.1002\/lpor.71128\">Free\u2010Space\u2010Coupled Frequency\u2010Locked Microtoroid Resonators With Reactive Polymer Functionalization for Part\u2010Per\u2010Trillion Gas Detection &#8211; Xu &#8211; Laser &amp; Photonics Reviews &#8211; Wiley Online Library<\/a><\/p><p>\u00a0<\/p><p>\u00a0<\/p>\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<div class=\"elementor-element elementor-element-291f067 elementor-widget elementor-widget-image\" data-id=\"291f067\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"image.default\">\n\t\t\t\t<div class=\"elementor-widget-container\">\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<img fetchpriority=\"high\" decoding=\"async\" width=\"779\" height=\"1024\" src=\"https:\/\/wp.optics.arizona.edu\/jsu\/wp-content\/uploads\/sites\/28\/2026\/08\/lpor71505-gra-0001-m-2-779x1024.jpg\" class=\"attachment-large size-large wp-image-2365\" alt=\"\" srcset=\"https:\/\/wp.optics.arizona.edu\/jsu\/wp-content\/uploads\/sites\/28\/2026\/08\/lpor71505-gra-0001-m-2-779x1024.jpg 779w, https:\/\/wp.optics.arizona.edu\/jsu\/wp-content\/uploads\/sites\/28\/2026\/08\/lpor71505-gra-0001-m-2-228x300.jpg 228w, https:\/\/wp.optics.arizona.edu\/jsu\/wp-content\/uploads\/sites\/28\/2026\/08\/lpor71505-gra-0001-m-2-768x1010.jpg 768w, https:\/\/wp.optics.arizona.edu\/jsu\/wp-content\/uploads\/sites\/28\/2026\/08\/lpor71505-gra-0001-m-2-1168x1536.jpg 1168w, https:\/\/wp.optics.arizona.edu\/jsu\/wp-content\/uploads\/sites\/28\/2026\/08\/lpor71505-gra-0001-m-2-1558x2048.jpg 1558w, https:\/\/wp.optics.arizona.edu\/jsu\/wp-content\/uploads\/sites\/28\/2026\/08\/lpor71505-gra-0001-m-2.jpg 1653w\" sizes=\"(max-width: 779px) 100vw, 779px\" \/>\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"<p>Happy to share our latest paper in Laser &amp; Photonics Reviews.We demonstrate free-space\u2013coupled, frequency-locked microtoroid resonators for gas sensing\u2014overcoming the long-standing limitation of fragile fiber tapers and moving WGM sensors closer to real-world use.We accomplished:\u2022 25 ppt detection limit at room temperature\u2022 &gt;10\u2077 Q factors preserved after polymer coating\u2022 3 orders of magnitude improvement over prior work\u2022 Compact, robust, and<\/p>\n","protected":false},"author":36,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[],"class_list":["post-2335","post","type-post","status-publish","format-standard","hentry","category-news"],"_links":{"self":[{"href":"https:\/\/wp.optics.arizona.edu\/jsu\/wp-json\/wp\/v2\/posts\/2335","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/wp.optics.arizona.edu\/jsu\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/wp.optics.arizona.edu\/jsu\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/wp.optics.arizona.edu\/jsu\/wp-json\/wp\/v2\/users\/36"}],"replies":[{"embeddable":true,"href":"https:\/\/wp.optics.arizona.edu\/jsu\/wp-json\/wp\/v2\/comments?post=2335"}],"version-history":[{"count":8,"href":"https:\/\/wp.optics.arizona.edu\/jsu\/wp-json\/wp\/v2\/posts\/2335\/revisions"}],"predecessor-version":[{"id":2371,"href":"https:\/\/wp.optics.arizona.edu\/jsu\/wp-json\/wp\/v2\/posts\/2335\/revisions\/2371"}],"wp:attachment":[{"href":"https:\/\/wp.optics.arizona.edu\/jsu\/wp-json\/wp\/v2\/media?parent=2335"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/wp.optics.arizona.edu\/jsu\/wp-json\/wp\/v2\/categories?post=2335"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/wp.optics.arizona.edu\/jsu\/wp-json\/wp\/v2\/tags?post=2335"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}