{"id":29389,"date":"2011-07-04T13:32:35","date_gmt":"2011-07-04T06:32:35","guid":{"rendered":"https:\/\/nano2.toolsmkt.com\/?p=2758"},"modified":"2011-07-04T13:32:35","modified_gmt":"2011-07-04T06:32:35","slug":"tiny-ring-laser-accurately-detects-and-counts-nanoparticles","status":"publish","type":"post","link":"https:\/\/www.nanotec.or.th\/en\/tiny-ring-laser-accurately-detects-and-counts-nanoparticles\/","title":{"rendered":"Tiny Ring Laser Accurately Detects and Counts Nanoparticles"},"content":{"rendered":"<p>Researchers at Washington University in St. Louis, United States, have developed a tiny doughnut-shaped laser sensor that detects very small particles, such as viruses, salt and soot.\u00a0 <!--more-->Virus particles can make us sick, salt particles trigger cloud formation, and soot particles can lodge in our lungs and make it harder to breathe.\u00a0 With the new sensor, light traveling around the micro-laser is disturbed by a particle landing on the ring, thus changing the light\u2019s frequency.\u00a0 The sensor is comprised of glass laced with atoms of certain rare earth elements.\u00a0 A particle\u2019s size and refractive index determine the effect of the particle on the lasing mode.\u00a0 As particles enter the \u201cmode volume\u201d of the micro-laser, a discrete upward or downward jump in the beat frequency signals the binding of a particle to the ring, and the number of jumps determines the number of particles. \u00a0\u00a0According to Lan Yang, PhD, an assistant professor of electrical and systems engineering who led the team that fabricated the sensor, there is already interest in its commercialization in fields ranging from biology to aerosol science.\u00a0 Near term uses \u201cwill be the monitoring of dynamic behaviors of particles in response to environmental and chemical changes at single particle resolution,\u201d said Yang, and the next step will be to see if the microlasers can be engineered to detect DNA and individualized biological molecules.\u00a0 The sensor is described in the online edition of the journal Nature Nanotechnology.<\/p>\n<p><a href=\"http:\/\/news.wustl.edu\/news\/Pages\/22462.aspx\">http:\/\/news.wustl.edu\/news\/Pages\/22462.aspx<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Researchers at Washington University in St. Louis, United States, have developed a tiny doughnut-shaped laser sensor that detects very small [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center 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