{"id":360,"date":"2017-08-29T14:10:44","date_gmt":"2017-08-29T06:10:44","guid":{"rendered":"http:\/\/sheng.people.ust.hk\/?p=360"},"modified":"2017-08-29T14:10:44","modified_gmt":"2017-08-29T06:10:44","slug":"superlensing-effect-in-photonic-crystals","status":"publish","type":"post","link":"https:\/\/sheng.people.ust.hk\/?p=360","title":{"rendered":"Superlensing effect in photonic crystals"},"content":{"rendered":"<p>At the Physics Department of HKUST, a group of researchers has been carrying out work on the superlensing effect in photonic crystals. We are:<\/p>\n<ul>\n<li>Che Ting Chan (theorist)<\/li>\n<li>Xinhua Hu (theorist)<\/li>\n<\/ul>\n<p>The lensing effect can be achieved in photonic crystal (PC) slabs, but in many situations, the mechanism can be traced to the self-collimation effect of a square-like constant frequency surface. We show that using a metal-in-dielectric configuration, circular constant frequency surfaces can be obtained, and the lensing effect then obeys fairly well the image-distance relationship characteristic of an n =\u00a0-1 material.\u00a0\u00a0As a two-dimensional example, far-field imaging is realized in square arrays of silver nanowires in air for transverse-electric waves at 400 nm.\u00a0\u00a0A high resolution of about 100 nm is obtained with a three-layer slab of such PCs.\u00a0\u00a0By varying the matrix, the results are extended to the optic and near-infrared regimes.<\/p>\n<p>&nbsp;<\/p>\n<p>[1] Xinhua Hu and C. T. Chan, <em>Appl. Phys. Lett<\/em>. 85, 1520 (2004).<\/p>\n<p><img loading=\"lazy\" class=\"aligncenter size-full wp-image-361\" src=\"http:\/\/sheng.people.ust.hk\/wp-content\/uploads\/2017\/08\/Superlensing-1.gif\" alt=\"\" width=\"236\" height=\"206\" \/><\/p>\n<figure id=\"attachment_362\" aria-describedby=\"caption-attachment-362\" style=\"width: 240px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" class=\"size-full wp-image-362\" src=\"http:\/\/sheng.people.ust.hk\/wp-content\/uploads\/2017\/08\/Superlensing-2.gif\" alt=\"\" width=\"240\" height=\"206\" \/><figcaption id=\"caption-attachment-362\" class=\"wp-caption-text\">Imaging with U + V = L is realized in square arrays of silver nanowires (diameter D = 59.9 nm and lattice constant a = 69.9 nm) in air for TE mode (E field perpendicular to the nanowires) at 400 nm (TM mode is forbidden).<\/figcaption><\/figure>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>At the Physics Department of HKUST, a group of researchers has been carrying out work on the superlensing effect in photonic crystals. We are: Che Ting Chan (theorist) Xinhua Hu (theorist) The lensing effect can be achieved in photonic crystal (PC) slabs, but in many situations, the mechanism can be traced to the self-collimation effect &hellip; <a href=\"https:\/\/sheng.people.ust.hk\/?p=360\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Superlensing effect in photonic crystals<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[5],"tags":[],"_links":{"self":[{"href":"https:\/\/sheng.people.ust.hk\/index.php?rest_route=\/wp\/v2\/posts\/360"}],"collection":[{"href":"https:\/\/sheng.people.ust.hk\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sheng.people.ust.hk\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sheng.people.ust.hk\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/sheng.people.ust.hk\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=360"}],"version-history":[{"count":1,"href":"https:\/\/sheng.people.ust.hk\/index.php?rest_route=\/wp\/v2\/posts\/360\/revisions"}],"predecessor-version":[{"id":363,"href":"https:\/\/sheng.people.ust.hk\/index.php?rest_route=\/wp\/v2\/posts\/360\/revisions\/363"}],"wp:attachment":[{"href":"https:\/\/sheng.people.ust.hk\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=360"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sheng.people.ust.hk\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=360"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sheng.people.ust.hk\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=360"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}