{"id":926,"date":"2019-06-04T15:57:12","date_gmt":"2019-06-04T15:57:12","guid":{"rendered":"https:\/\/labsites.wdev.rochester.edu\/agrawal\/?page_id=926"},"modified":"2020-12-17T19:28:57","modified_gmt":"2020-12-17T19:28:57","slug":"dynamic-optical-systems","status":"publish","type":"page","link":"https:\/\/labsites.rochester.edu\/agrawal\/current-research\/dynamic-optical-systems\/","title":{"rendered":"Temporal waveguides"},"content":{"rendered":"\n<p><strong><span class=\"has-inline-color has-vivid-purple-color\">Reflection at a temporal Boundary<\/span><\/strong><\/p>\n\n\n\n<p>Recently considerable interest has focused on a dynamic optical system whose refractive index changed in a dynamic fashion making it time dependent.  Initially, this interest stemmed from the observation of <strong>adiabatic wavelength  conversion<\/strong> in optical resonators. More recently, a space-time analogy has been exploited to make a time lens and use it for temporal imaging. <\/p>\n\n\n\n<div class=\"wp-block-image\"><figure class=\"aligncenter\"><img loading=\"lazy\" decoding=\"async\" width=\"500\" height=\"345\" src=\"https:\/\/labsites.rochester.edu\/agrawal\/wp-content\/uploads\/2019\/06\/refl2.png\" alt=\"\" class=\"wp-image-936\" srcset=\"https:\/\/labsites.rochester.edu\/agrawal\/wp-content\/uploads\/2019\/06\/refl2.png 500w, https:\/\/labsites.rochester.edu\/agrawal\/wp-content\/uploads\/2019\/06\/refl2-300x207.png 300w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><figcaption>Evolution an optical pulse across a temporal boundary (Source: PRL 115, 183901)<\/figcaption><\/figure><\/div>\n\n\n\n<p>My group has developed a time-transformation approach for studying light propagation inside a dynamic optical medium. Our approach transforms the electric field directly through a temporal mapping and does not require the slowly varying envelop approximation. The time-transformation approach provides valuable physical insight in the fields of optical signal processing and ultrafast optics.<\/p>\n\n\n\n<p><strong><span class=\"has-inline-color has-vivid-purple-color\">Temporal Waveguides<\/span><\/strong><\/p>\n\n\n\n<figure class=\"wp-block-image\"><img loading=\"lazy\" decoding=\"async\" width=\"1024\" height=\"312\" src=\"https:\/\/labsites.rochester.edu\/agrawal\/wp-content\/uploads\/2019\/11\/tir1-slider-1024x312.jpg\" alt=\"\" class=\"wp-image-13492\" srcset=\"https:\/\/labsites.rochester.edu\/agrawal\/wp-content\/uploads\/2019\/11\/tir1-slider-1024x312.jpg 1024w, https:\/\/labsites.rochester.edu\/agrawal\/wp-content\/uploads\/2019\/11\/tir1-slider-300x91.jpg 300w, https:\/\/labsites.rochester.edu\/agrawal\/wp-content\/uploads\/2019\/11\/tir1-slider-768x234.jpg 768w, https:\/\/labsites.rochester.edu\/agrawal\/wp-content\/uploads\/2019\/11\/tir1-slider.jpg 1920w\" sizes=\"auto, (max-width: 767px) 89vw, (max-width: 1000px) 54vw, (max-width: 1071px) 543px, 580px\" \/><figcaption><em>Temporal waveguide made using two boundaries (dashed lines) that confine short optical pulses between them. Spectral trace shows large frequency shifts that occur during each temporal total internal reflection.<\/em><\/figcaption><\/figure>\n\n\n\n<p>More recently we have studied the temporal analogs of spatial reflection and refraction occurring when the refractive index changes suddenly at a temporal boundary. We have also shown that the temporal analog of total internal reflection can be exploited to make a temporal waveguide that confines a pulse inside it. Since September 2019, this project is supported by a NSF grant.<\/p>\n\n\n\n<p>For a list of recent publications, visit our <a href=\"https:\/\/labsites.rochester.edu\/agrawal\/publications\/\">publications page<\/a>.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Reflection at a temporal Boundary Recently considerable interest has focused on a dynamic optical system whose refractive index changed in a dynamic fashion making it time dependent. Initially, this interest stemmed from the observation of adiabatic wavelength conversion in optical resonators. More recently, a space-time analogy has been exploited to make a time lens and &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/labsites.rochester.edu\/agrawal\/current-research\/dynamic-optical-systems\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;Temporal waveguides&#8221;<\/span><\/a><\/p>\n","protected":false},"author":0,"featured_media":0,"parent":646,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-926","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/labsites.rochester.edu\/agrawal\/wp-json\/wp\/v2\/pages\/926","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/labsites.rochester.edu\/agrawal\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/labsites.rochester.edu\/agrawal\/wp-json\/wp\/v2\/types\/page"}],"replies":[{"embeddable":true,"href":"https:\/\/labsites.rochester.edu\/agrawal\/wp-json\/wp\/v2\/comments?post=926"}],"version-history":[{"count":5,"href":"https:\/\/labsites.rochester.edu\/agrawal\/wp-json\/wp\/v2\/pages\/926\/revisions"}],"predecessor-version":[{"id":15012,"href":"https:\/\/labsites.rochester.edu\/agrawal\/wp-json\/wp\/v2\/pages\/926\/revisions\/15012"}],"up":[{"embeddable":true,"href":"https:\/\/labsites.rochester.edu\/agrawal\/wp-json\/wp\/v2\/pages\/646"}],"wp:attachment":[{"href":"https:\/\/labsites.rochester.edu\/agrawal\/wp-json\/wp\/v2\/media?parent=926"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}