<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="7.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">BASKOURELOS, K.</style></author><author><style face="normal" font="default" size="100%">O. Tsilipakos</style></author><author><style face="normal" font="default" size="100%">Stefański, T.</style></author><author><style face="normal" font="default" size="100%">S. F. Galata</style></author><author><style face="normal" font="default" size="100%">Economou, E.</style></author><author><style face="normal" font="default" size="100%">M. Kafesaki</style></author><author><style face="normal" font="default" size="100%">K. L. Tsakmakidis</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Topological extraordinary optical transmission</style></title><secondary-title><style face="normal" font="default" size="100%">Phys. Rev. Research</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2022</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://doi.org/10.1103/PhysRevResearch.4.L032011</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">4</style></volume><pages><style face="normal" font="default" size="100%">L032011</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;span&gt;Τhe incumbent technology for bringing light to the nanoscale, the near-field scanning optical microscope, has notoriously small throughput efficiencies of the order of&amp;nbsp;&lt;/span&gt;&lt;span id=&quot;MathJax-Element-1-Frame&quot; class=&quot;mjx-chtml MathJax_CHTML&quot;&gt;&lt;span id=&quot;MJXc-Node-1&quot; class=&quot;mjx-math&quot;&gt;&lt;span id=&quot;MJXc-Node-2&quot; class=&quot;mjx-mrow&quot;&gt;&lt;span id=&quot;MJXc-Node-3&quot; class=&quot;mjx-msup&quot;&gt;&lt;span class=&quot;mjx-base&quot;&gt;&lt;span id=&quot;MJXc-Node-4&quot; class=&quot;mjx-mrow&quot;&gt;&lt;span id=&quot;MJXc-Node-5&quot; class=&quot;mjx-mn&quot;&gt;&lt;span class=&quot;mjx-char MJXc-TeX-main-R&quot;&gt;10&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span class=&quot;mjx-sup&quot;&gt;&lt;span id=&quot;MJXc-Node-6&quot; class=&quot;mjx-mrow&quot;&gt;&lt;span id=&quot;MJXc-Node-7&quot; class=&quot;mjx-mtext&quot;&gt;&lt;/span&gt;&lt;span id=&quot;MJXc-Node-8&quot; class=&quot;mjx-mn&quot;&gt;&lt;span class=&quot;mjx-char MJXc-TeX-main-R&quot;&gt;4&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span&gt;&amp;nbsp;−&lt;/span&gt;&lt;span id=&quot;MathJax-Element-2-Frame&quot; class=&quot;mjx-chtml MathJax_CHTML&quot;&gt;&lt;span id=&quot;MJXc-Node-9&quot; class=&quot;mjx-math&quot;&gt;&lt;span id=&quot;MJXc-Node-10&quot; class=&quot;mjx-mrow&quot;&gt;&lt;span id=&quot;MJXc-Node-11&quot; class=&quot;mjx-msup&quot;&gt;&lt;span class=&quot;mjx-base&quot;&gt;&lt;span id=&quot;MJXc-Node-12&quot; class=&quot;mjx-mrow&quot;&gt;&lt;span id=&quot;MJXc-Node-13&quot; class=&quot;mjx-mn&quot;&gt;&lt;span class=&quot;mjx-char MJXc-TeX-main-R&quot;&gt;10&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span class=&quot;mjx-sup&quot;&gt;&lt;span id=&quot;MJXc-Node-14&quot; class=&quot;mjx-mrow&quot;&gt;&lt;span id=&quot;MJXc-Node-15&quot; class=&quot;mjx-mtext&quot;&gt;&lt;/span&gt;&lt;span id=&quot;MJXc-Node-16&quot; class=&quot;mjx-mn&quot;&gt;&lt;span class=&quot;mjx-char MJXc-TeX-main-R&quot;&gt;5&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span&gt;, or less. We report on a&amp;nbsp;&lt;/span&gt;&lt;em&gt;broadband&lt;/em&gt;&lt;span&gt;, topological, unidirectionally guiding structure, not requiring adiabatic tapering and, in principle, enabling near-perfect (∼100%) optical transmission through an unstructured single arbitrarily subdiffraction slit at its end. Specifically, for a slit width of just&amp;nbsp;&lt;/span&gt;&lt;span id=&quot;MathJax-Element-3-Frame&quot; class=&quot;mjx-chtml MathJax_CHTML&quot;&gt;&lt;span id=&quot;MJXc-Node-17&quot; class=&quot;mjx-math&quot;&gt;&lt;span id=&quot;MJXc-Node-18&quot; class=&quot;mjx-mrow&quot;&gt;&lt;span id=&quot;MJXc-Node-19&quot; class=&quot;mjx-mrow&quot;&gt;&lt;span id=&quot;MJXc-Node-20&quot; class=&quot;mjx-msub&quot;&gt;&lt;span class=&quot;mjx-base&quot;&gt;&lt;span id=&quot;MJXc-Node-21&quot; class=&quot;mjx-mi&quot;&gt;&lt;span class=&quot;mjx-char MJXc-TeX-math-I&quot;&gt;λ&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span class=&quot;mjx-sub&quot;&gt;&lt;span id=&quot;MJXc-Node-22&quot; class=&quot;mjx-mi&quot;&gt;&lt;span class=&quot;mjx-char MJXc-TeX-main-B&quot;&gt;eff&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span id=&quot;MJXc-Node-23&quot; class=&quot;mjx-mo&quot;&gt;&lt;span class=&quot;mjx-char MJXc-TeX-main-R&quot;&gt;/&lt;/span&gt;&lt;/span&gt;&lt;span id=&quot;MJXc-Node-24&quot; class=&quot;mjx-mn&quot;&gt;&lt;span class=&quot;mjx-char MJXc-TeX-main-B&quot;&gt;72&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span id=&quot;MathJax-Element-4-Frame&quot; class=&quot;mjx-chtml MathJax_CHTML&quot;&gt;&lt;span id=&quot;MJXc-Node-25&quot; class=&quot;mjx-math&quot;&gt;&lt;span id=&quot;MJXc-Node-26&quot; class=&quot;mjx-mrow&quot;&gt;&lt;span id=&quot;MJXc-Node-27&quot; class=&quot;mjx-mrow&quot;&gt;&lt;span id=&quot;MJXc-Node-28&quot; class=&quot;mjx-mo&quot;&gt;&lt;span class=&quot;mjx-char MJXc-TeX-main-R&quot;&gt;(&lt;/span&gt;&lt;/span&gt;&lt;span id=&quot;MJXc-Node-29&quot; class=&quot;mjx-mrow&quot;&gt;&lt;span id=&quot;MJXc-Node-30&quot; class=&quot;mjx-msub&quot;&gt;&lt;span class=&quot;mjx-base&quot;&gt;&lt;span id=&quot;MJXc-Node-31&quot; class=&quot;mjx-mi&quot;&gt;&lt;span class=&quot;mjx-char MJXc-TeX-math-I&quot;&gt;λ&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span class=&quot;mjx-sub&quot;&gt;&lt;span id=&quot;MJXc-Node-32&quot; class=&quot;mjx-mn&quot;&gt;&lt;span class=&quot;mjx-char MJXc-TeX-main-R&quot;&gt;0&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span id=&quot;MJXc-Node-33&quot; class=&quot;mjx-mo&quot;&gt;&lt;span class=&quot;mjx-char MJXc-TeX-main-R&quot;&gt;/&lt;/span&gt;&lt;/span&gt;&lt;span id=&quot;MJXc-Node-34&quot; class=&quot;mjx-mn&quot;&gt;&lt;span class=&quot;mjx-char MJXc-TeX-main-R&quot;&gt;138&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span id=&quot;MJXc-Node-35&quot; class=&quot;mjx-mo&quot;&gt;&lt;span class=&quot;mjx-char MJXc-TeX-main-R&quot;&gt;)&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span&gt;&amp;nbsp;the attained normalized transmission coefficient reaches a value of&amp;nbsp;&lt;/span&gt;&lt;span&gt;1.52&lt;/span&gt;&lt;span&gt;, while for a unidirectional-only (nontopological) device the normalized transmission through a&amp;nbsp;&lt;/span&gt;&lt;span id=&quot;MathJax-Element-5-Frame&quot; class=&quot;mjx-chtml MathJax_CHTML&quot;&gt;&lt;span id=&quot;MJXc-Node-36&quot; class=&quot;mjx-math&quot;&gt;&lt;span id=&quot;MJXc-Node-37&quot; class=&quot;mjx-mrow&quot;&gt;&lt;span id=&quot;MJXc-Node-38&quot; class=&quot;mjx-mrow&quot;&gt;&lt;span id=&quot;MJXc-Node-39&quot; class=&quot;mjx-msub&quot;&gt;&lt;span class=&quot;mjx-base&quot;&gt;&lt;span id=&quot;MJXc-Node-40&quot; class=&quot;mjx-mi&quot;&gt;&lt;span class=&quot;mjx-char MJXc-TeX-math-I&quot;&gt;λ&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span class=&quot;mjx-sub&quot;&gt;&lt;span id=&quot;MJXc-Node-41&quot; class=&quot;mjx-mi&quot;&gt;&lt;span class=&quot;mjx-char MJXc-TeX-main-R&quot;&gt;eff&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span id=&quot;MJXc-Node-42&quot; class=&quot;mjx-mo&quot;&gt;&lt;span class=&quot;mjx-char MJXc-TeX-main-R&quot;&gt;/&lt;/span&gt;&lt;/span&gt;&lt;span id=&quot;MJXc-Node-43&quot; class=&quot;mjx-mn&quot;&gt;&lt;span class=&quot;mjx-char MJXc-TeX-main-R&quot;&gt;21&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span&gt;&amp;nbsp;&lt;/span&gt;&lt;span id=&quot;MathJax-Element-6-Frame&quot; class=&quot;mjx-chtml MathJax_CHTML&quot;&gt;&lt;span id=&quot;MJXc-Node-44&quot; class=&quot;mjx-math&quot;&gt;&lt;span id=&quot;MJXc-Node-45&quot; class=&quot;mjx-mrow&quot;&gt;&lt;span id=&quot;MJXc-Node-46&quot; class=&quot;mjx-mrow&quot;&gt;&lt;span id=&quot;MJXc-Node-47&quot; class=&quot;mjx-mo&quot;&gt;&lt;span class=&quot;mjx-char MJXc-TeX-main-R&quot;&gt;(&lt;/span&gt;&lt;/span&gt;&lt;span id=&quot;MJXc-Node-48&quot; class=&quot;mjx-mo&quot;&gt;&lt;span class=&quot;mjx-char MJXc-TeX-main-R&quot;&gt;∼&lt;/span&gt;&lt;/span&gt;&lt;span id=&quot;MJXc-Node-49&quot; class=&quot;mjx-msub MJXc-space3&quot;&gt;&lt;span class=&quot;mjx-base&quot;&gt;&lt;span id=&quot;MJXc-Node-50&quot; class=&quot;mjx-mi&quot;&gt;&lt;span class=&quot;mjx-char MJXc-TeX-math-I&quot;&gt;λ&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span class=&quot;mjx-sub&quot;&gt;&lt;span id=&quot;MJXc-Node-51&quot; class=&quot;mjx-mn&quot;&gt;&lt;span class=&quot;mjx-char MJXc-TeX-main-R&quot;&gt;0&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span id=&quot;MJXc-Node-52&quot; class=&quot;mjx-mo&quot;&gt;&lt;span class=&quot;mjx-char MJXc-TeX-main-R&quot;&gt;/&lt;/span&gt;&lt;/span&gt;&lt;span id=&quot;MJXc-Node-53&quot; class=&quot;mjx-mn&quot;&gt;&lt;span class=&quot;mjx-char MJXc-TeX-main-R&quot;&gt;107&lt;/span&gt;&lt;/span&gt;&lt;span id=&quot;MJXc-Node-54&quot; class=&quot;mjx-mo&quot;&gt;&lt;span class=&quot;mjx-char MJXc-TeX-main-R&quot;&gt;)&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span&gt;&amp;nbsp;slit reaches&amp;nbsp;&lt;/span&gt;&lt;span&gt;1.14&lt;/span&gt;&lt;span&gt;; both limited only by inherent material losses, and with zero reflection from the slit. The associated, under ideal (ultralow-loss) conditions, near-perfect optical extraordinary transmission has implications, among diverse areas in wave physics and engineering, for high-efficiency, maximum-throughput nanoscopes and heat-assisted magnetic recording devices.&lt;/span&gt;</style></abstract></record></records></xml>