{"id":5596,"date":"2017-05-05T12:12:45","date_gmt":"2017-05-05T16:12:45","guid":{"rendered":"http:\/\/iridian.mf-tested.com\/?p=5596\/"},"modified":"2017-09-05T12:14:44","modified_gmt":"2017-09-05T16:14:44","slug":"ultralow-frequency-raman-system-10-cm%e2%88%921-longpass-edge-filters-application-interface-coupling-t22lgs","status":"publish","type":"post","link":"https:\/\/iridian.jp\/en\/news\/ultralow-frequency-raman-system-10-cm%e2%88%921-longpass-edge-filters-application-interface-coupling-t22lgs\/","title":{"rendered":"Ultralow-frequency Raman system down to 10 cm\u22121 with longpass edge filters and its application to the interface coupling in t(2+2)LGs"},"content":{"rendered":"<p>Ultralow-frequency (ULF) Raman spectroscopy becomes increasingly important in the area of two-dimensional (2D) layered materials; however, such measurement usually requires expensive and nonstandard equipment. Here, the measurement of ULF Raman signal down to 10 cm<sup>\u22121<\/sup> has been realized with high throughput by combining a kind of longpass edge filters with a single monochromator, which are verified by the Raman spectrum of L-cystine using three laser excitations. Fine adjustment of the angle of incident laser beam from normal of the longpass edge filters and selection of polarization geometry are demonstrated how to probe ULF Raman signal with high signal-to-noise. Davydov splitting of the shear mode in twisted (2+2) layer graphenes (t(2+2)LG) has been observed by such system in both exfoliated and transferred samples. We provide a direct evidence of twist-angle dependent softening of the shear coupling in t(2+2)LG, while the layer-breathing coupling at twisted interfaces is found to be almost identical to that in bulk graphite. This suggests that the exfoliation and transferring techniques are enough good to make a good 2D heterostructures to demonstrate potential device application. This Raman system will be potentially applied to the research field of ULF Raman spectroscopy.<\/p>\n<p>http:\/\/aip.scitation.org\/doi\/10.1063\/1.4952384<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Ultralow-frequency (ULF) Raman spectroscopy becomes increasingly important in the area of two-dimensional (2D) layered materials; however, such measurement usually requires expensive and nonstandard equipment. Here, the measurement of ULF Raman signal down to 10 cm\u22121 has been realized with high throughput by combining a kind of longpass edge filters with a single monochromator, which are [&hellip;]<\/p>\n","protected":false},"author":155,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[17],"tags":[],"class_list":["post-5596","post","type-post","status-publish","format-standard","hentry","category-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.7 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Ultralow-frequency Raman system down to 10 cm\u22121 with longpass edge filters and its application to the interface coupling in t(2+2)LGs - Iridian Spectral Technologies<\/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:\/\/iridian.jp\/en\/news\/ultralow-frequency-raman-system-10-cm%e2%88%921-longpass-edge-filters-application-interface-coupling-t22lgs\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Ultralow-frequency Raman system down to 10 cm\u22121 with longpass edge filters and its application to the interface coupling in t(2+2)LGs\" \/>\n<meta property=\"og:description\" content=\"Ultralow-frequency (ULF) Raman spectroscopy becomes increasingly important in the area of two-dimensional (2D) layered materials; however, such measurement usually requires expensive and nonstandard equipment. Here, the measurement of ULF Raman signal down to 10 cm\u22121 has been realized with high throughput by combining a kind of longpass edge filters with a single monochromator, which are [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/iridian.jp\/en\/news\/ultralow-frequency-raman-system-10-cm%e2%88%921-longpass-edge-filters-application-interface-coupling-t22lgs\/\" \/>\n<meta property=\"og:site_name\" content=\"Iridian Spectral Technologies\" \/>\n<meta property=\"article:published_time\" content=\"2017-05-05T16:12:45+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2017-09-05T16:14:44+00:00\" \/>\n<meta name=\"author\" content=\"Michael Sauve\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Michael Sauve\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/iridian.jp\\\/en\\\/news\\\/ultralow-frequency-raman-system-10-cm%e2%88%921-longpass-edge-filters-application-interface-coupling-t22lgs\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/iridian.jp\\\/en\\\/news\\\/ultralow-frequency-raman-system-10-cm%e2%88%921-longpass-edge-filters-application-interface-coupling-t22lgs\\\/\"},\"author\":{\"name\":\"Michael Sauve\",\"@id\":\"https:\\\/\\\/iridian.jp\\\/en\\\/#\\\/schema\\\/person\\\/0f7dd846413df49827058181f05aef49\"},\"headline\":\"Ultralow-frequency Raman system down to 10 cm\u22121 with longpass edge filters and its application to the interface coupling in t(2+2)LGs\",\"datePublished\":\"2017-05-05T16:12:45+00:00\",\"dateModified\":\"2017-09-05T16:14:44+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/iridian.jp\\\/en\\\/news\\\/ultralow-frequency-raman-system-10-cm%e2%88%921-longpass-edge-filters-application-interface-coupling-t22lgs\\\/\"},\"wordCount\":217,\"articleSection\":[\"News\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/iridian.jp\\\/en\\\/news\\\/ultralow-frequency-raman-system-10-cm%e2%88%921-longpass-edge-filters-application-interface-coupling-t22lgs\\\/\",\"url\":\"https:\\\/\\\/iridian.jp\\\/en\\\/news\\\/ultralow-frequency-raman-system-10-cm%e2%88%921-longpass-edge-filters-application-interface-coupling-t22lgs\\\/\",\"name\":\"Ultralow-frequency Raman system down to 10 cm\u22121 with longpass edge filters and its application to the interface coupling in t(2+2)LGs - 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