<?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%">N. Stefanou</style></author><author><style face="normal" font="default" size="100%">A. Modinos</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Impurity bands in photonic insulators</style></title><secondary-title><style face="normal" font="default" size="100%">Physical Review B</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">1998</style></year></dates><volume><style face="normal" font="default" size="100%">57</style></volume><pages><style face="normal" font="default" size="100%">12127-12133</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;A chain of impurity cells in a photonic insulator introduces impurity modes of the electromagnetic field over a narrow band of frequencies. We introduce a model of this band in the manner of a tight-binding description of impurity bands in semiconductors, and use it to describe waveguiding along the chain, and, in particular, across a corner of &lt;span class=&quot;aps-inline-formula&quot;&gt;&lt;span class=&quot;MathJax_Preview&quot;&gt;&lt;/span&gt;&lt;span id=&quot;MathJax-Element-1-Frame&quot; style=&quot;display: inline-block;&quot; class=&quot;MathJax&quot;&gt;&lt;span id=&quot;MathJax-Span-1&quot; style=&quot;width: 1.66em; display: inline-block;&quot; class=&quot;math&quot;&gt;&lt;span style=&quot;width: 1px; height: 0px; overflow: hidden; margin-right: -1px; display: inline-block;&quot;&gt;&lt;/span&gt;&lt;span style=&quot;width: 1.52em; height: 0px; font-size: 108%; display: inline-block; position: relative;&quot;&gt;&lt;span style=&quot;left: 0em; top: -3.96em; position: absolute; clip: rect(3.05em, 1000em, 4.18em, -0.55em);&quot;&gt;&lt;span id=&quot;MathJax-Span-2&quot; class=&quot;mrow&quot;&gt;&lt;span id=&quot;MathJax-Span-3&quot; style=&quot;font-family: MathJax_Main-Web;&quot; class=&quot;mn&quot;&gt;90&lt;/span&gt;&lt;span id=&quot;MathJax-Span-4&quot; style=&quot;font-family: MathJax_Main-Web;&quot; class=&quot;mi&quot;&gt;°&lt;/span&gt;&lt;/span&gt;&amp;nbsp;&lt;span style=&quot;width: 0px; height: 3.96em; display: inline-block;&quot;&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt;&lt;span style=&quot;width: 0px; height: 0.93em; overflow: hidden; vertical-align: -0.09em; border-left-color: currentColor; border-left-width: 0em; border-left-style: solid; display: inline-block;&quot;&gt;&lt;/span&gt;&lt;/span&gt;&lt;/span&gt; &lt;/span&gt;. We also point out the possibility of using impurity bands in photonic insulators to study wave propagation along an effectively one-dimensional disordered chain.&lt;/p&gt;</style></abstract><issue><style face="normal" font="default" size="100%">19</style></issue></record></records></xml>