{"id":4204,"date":"2022-11-28T09:07:18","date_gmt":"2022-11-28T14:07:18","guid":{"rendered":"https:\/\/my.vanderbilt.edu\/vinsenews\/?p=4204"},"modified":"2022-11-28T09:07:18","modified_gmt":"2022-11-28T14:07:18","slug":"mid-to-far-infrared-anisotropic-dielectric-function-of-hfs2-and-hfse2-published-in-advanced-optical-materials-selected-as-a-vinse-spotlight-publication","status":"publish","type":"post","link":"https:\/\/my.vanderbilt.edu\/vinsenews\/2022\/11\/mid-to-far-infrared-anisotropic-dielectric-function-of-hfs2-and-hfse2-published-in-advanced-optical-materials-selected-as-a-vinse-spotlight-publication\/","title":{"rendered":"\u201cMid- to Far-Infrared Anisotropic Dielectric Function of HfS2 and HfSe2\u201d published in Advanced Optical Materials, selected as a VINSE Spotlight Publication"},"content":{"rendered":"<p><a href=\"https:\/\/cdn.vanderbilt.edu\/t2-my\/my-prd\/wp-content\/uploads\/sites\/1669\/2022\/11\/kowalski_Caldwell_2022.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-4205\" src=\"https:\/\/cdn.vanderbilt.edu\/t2-my\/my-prd\/wp-content\/uploads\/sites\/1669\/2022\/11\/kowalski_Caldwell_2022-650x296.png\" alt=\"kowalski_Caldwell_2022\" width=\"650\" height=\"296\" srcset=\"https:\/\/cdn.vanderbilt.edu\/t2-my\/my-prd\/wp-content\/uploads\/sites\/1669\/2022\/11\/kowalski_Caldwell_2022-650x296.png 650w, https:\/\/cdn.vanderbilt.edu\/t2-my\/my-prd\/wp-content\/uploads\/sites\/1669\/2022\/11\/kowalski_Caldwell_2022-300x136.png 300w, https:\/\/cdn.vanderbilt.edu\/t2-my\/my-prd\/wp-content\/uploads\/sites\/1669\/2022\/11\/kowalski_Caldwell_2022-768x349.png 768w, https:\/\/cdn.vanderbilt.edu\/t2-my\/my-prd\/wp-content\/uploads\/sites\/1669\/2022\/11\/kowalski_Caldwell_2022.png 1033w\" sizes=\"auto, (max-width: 650px) 100vw, 650px\" \/><\/a><\/p>\n<p>About the author: Ryan Kowalski is a fourth-year graduate student pursuing a PhD in Interdisciplinary Materials Science under the direction Dr. Josh Caldwell. Using infrared spectroscopy, the Caldwell group investigates the optical properties of semiconductor materials for optoelectronic devices. Ryan&#8217;s recent publication in <em>Advanced Optical Materials<\/em> characterizes the anisotropic dielectric functions of 2D van der Waals materials, HfS<sub>2<\/sub> and HfSe<sub>2<\/sub> . The crystal anisotropy of these polar dielectric materials gives rise to a spectral region, the Reststrahlen band, that can host light-matter quasiparticles called surface phonon polaritons (SPhPs). SPhPs allow for extreme confinement of light beyond the diffraction limit, an essential component for nanophotonic devices. Furthermore, it is found that HfS\u00ad<sub>2<\/sub> and HfSe<sub>2<\/sub> have extremely large Reststrahlen bands that span most of the far-infrared, a region of the electromagnetic spectrum that has traditionally been restricted due to materials constraints. This work paves the way for a potentially new class of optical infrastructure in the far-infrared.<\/p>\n<p><strong><a href=\"https:\/\/www.vanderbilt.edu\/vinse\/Advanced_Optical_Materials_Kowalski_2022.pdf\">&#8211;READ ARTICLE&#8211;<\/a><\/strong><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>About the author: Ryan Kowalski is a fourth-year graduate student pursuing a PhD in Interdisciplinary Materials Science under the direction Dr. Josh Caldwell. Using infrared spectroscopy, the Caldwell group investigates the optical properties of semiconductor materials for optoelectronic devices. Ryan&#8217;s recent publication in Advanced Optical Materials characterizes the anisotropic dielectric functions of 2D van der&#8230;<\/p>\n","protected":false},"author":3411,"featured_media":4205,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1,35],"tags":[34,84,286,37],"class_list":["post-4204","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news","category-spotlight-publications","tag-ims","tag-josh-caldwell","tag-ryan-kowalski","tag-spotlight-publication"],"_links":{"self":[{"href":"https:\/\/my.vanderbilt.edu\/vinsenews\/wp-json\/wp\/v2\/posts\/4204","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/my.vanderbilt.edu\/vinsenews\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/my.vanderbilt.edu\/vinsenews\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/my.vanderbilt.edu\/vinsenews\/wp-json\/wp\/v2\/users\/3411"}],"replies":[{"embeddable":true,"href":"https:\/\/my.vanderbilt.edu\/vinsenews\/wp-json\/wp\/v2\/comments?post=4204"}],"version-history":[{"count":1,"href":"https:\/\/my.vanderbilt.edu\/vinsenews\/wp-json\/wp\/v2\/posts\/4204\/revisions"}],"predecessor-version":[{"id":4206,"href":"https:\/\/my.vanderbilt.edu\/vinsenews\/wp-json\/wp\/v2\/posts\/4204\/revisions\/4206"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/my.vanderbilt.edu\/vinsenews\/wp-json\/wp\/v2\/media\/4205"}],"wp:attachment":[{"href":"https:\/\/my.vanderbilt.edu\/vinsenews\/wp-json\/wp\/v2\/media?parent=4204"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/my.vanderbilt.edu\/vinsenews\/wp-json\/wp\/v2\/categories?post=4204"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/my.vanderbilt.edu\/vinsenews\/wp-json\/wp\/v2\/tags?post=4204"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}