Update photonics/index.html

Hi Cristophe,

small: update new refs and models!

Cheers, Guillaume

photonics/index.html

@@ -81,9 +81,13 @@
     >models/BlochPeriodicWaveguides</a></code>.
   <li>A collection of non-Linear eigenvalue
     problems<a href="#8"><sup>8-9</sup></a> (quadratic, polynomial and rational)
-    is avaiable in
+    (for the computation of Quasi Normal Modes) is avaiable in
     <code><a href="https://gitlab.onelab.info/doc/models/-/tree/master/NonLinearEVP"
     >models/NonLinearEVP</a></code>.
+  <li>An example of (Dispersive) Quasi Normal Modes expansion 
+    <a href="#10"><sup>10</sup></a> is avaiable in
+    <code><a href="https://gitlab.onelab.info/doc/models/-/tree/master/QuasiNormalModeExpansion"
+    >models/QuasiNormalModeExpansion</a></code>.
 </ul>
 
 <h2>References</h2>
@@ -127,6 +131,11 @@
       <a href="https://arxiv.org/abs/1807.02355">
         Photonics in highly dispersive media: the exact modal expansion</a>.
       Opt. Lett. 43, 5813, 2018.
+    <li><a name="10"></a>A. Nicolet, G. Demésy, F. Zolla, C. Campos, J. E. Roman, C. Geuzaine,
+      <a href="https://www.sciencedirect.com/science/article/abs/pii/S099775382200239X">
+        Physically agnostic quasi normal mode expansion in time dispersive structures: 
+        From mechanical vibrations to nanophotonic resonances</a>.
+        European J. of Mechanics - A/Solids, 104809, 2022.
   </ol>
 </div>