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The implementation of metals in photonic devices (e.g., solar cells, cloaking devices and optical filters), however, has been limited by the fundamental optical properties of pure metals.</p> <p>To overcome such limitations, researchers in the Leite Group at the University of Maryland (UMD) have developed a class of metallic materials with tunable optical properties based on alloys of silver and gold.</p> <p>This work – in collaboration with researchers at the Army Research Lab (ARL) in Maryland and Instituto de FÃsica Teórica (IFT) in Brazil – uses Density Functional Theory (DFT), a computational method for modeling the electronic structure of materials, to explain why each alloy has a unique optical response.</p> <p>The novelty of this research – published online June 25 in <a href="../../onlinelibrary.wiley.com/doi/full/10.1002/adom.201800218"><em>Advanced Optical Materials</em></a> – lies in connecting the optical properties seen in the alloys to the calculated band structure; a representation of the energy levels of electrons in the metal. Chen Gong – a former student in the UMD Department of Materials Science and Engineering (MSE), now an engineer at Applied Materials – served as first author on the paper. </p> <p>“By understanding the physical origin of these optical properties, scientists can learn how to create new materials with properties optimized for specific photonic applications,†Marina Leite, an MSE assistant professor.</p> <p>Silver-gold alloys are just the starting point. The DFT method, which combines experiments and calculations, can potentially be extended to any other system such as carbides, nitrides and metal oxides. The method offers a systematic way to study the optical properties for new materials, which in turn allow the design of building blocks for applications in energy harvesting, sensing, light-induced catalysis, and more.</p> <p>For additional information:</p> <p>C. Gong, A. Kaplan, Z. A. Benson, D. R. Baker, J. P. McClure, A. R. Rocha, M. S. Leite. <strong>Band Structure Engineering by Alloying for Photonic. </strong><em>Advanced Optical Materials</em> 2018, 1800218. DOI: 10.1002/adom.201800218</p> <p>Related media:</p> <p><a href="../../phys.org/news/2018-10-army-materials.html">Army research lights the way for new materials</a> - ARL, 10 Oct 2018</p> <br><br><strong>Related Articles:</strong> <br><a href="news_story.php__querystring__id=11893">The Promise of Perovskites: Using machine learning techniques, Leite Group investigates impact of environmental stressors on perovskites.</a><br><a href="news_story.php__querystring__id=11563">Marina Leite to Give a Plenary Talk at International Conference in Belgium</a><br><a href="news_story.php__querystring__id=11017">Leite Group Creates Nano-sized Super-absorber, Published in Advanced Optical Materials</a><br><a href="news_story.php__querystring__id=10386">Sunbeams at the Nano-scale: the Next Generation of Solar Cells</a> <br><br><span class="caption">June 27, 2018</span> <p></p> <br clear="all"> <table border="0" cellpadding="0" cellspacing="0" id="previousNext" width="100%"> <tbody><tr> <td width="45%"><a href="news_story.php__querystring__id=11446">«Previous Story </a></td> <td> </td> <td width="45%"><div align="right"><a href="news_story.php__querystring__id=11475">Next Story»</a> </div></td> </tr> </tbody></table> <p> </p> </td> </tr> </tbody></table> </td> <td valign="top" width="20"> </td> <td valign="top" width="1"> <img align="left" height="495" src="../../www.eng.umd.edu/images/sub/layout/rhtcolline.gif" width="1"> </td> <td align="left" valign="top" width="172"> <table border="0" cellpadding="10" cellspacing="0" id="currentHeadlines" width="100%"> <tbody><tr> <td align="left" valign="top" width="100%"><p class="rightHeader">Current Headlines </p> <p class="caption4"><a href="news_story.php__querystring__id=15282">Selected Publications from NanoCenter's AIM Lab and FabLab</a></p> <p class="caption4"><a href="news_story.php__querystring__id=15553">Connect with Maryland Engineering at the 2023 ASEE Annual Conference</a></p> <p class="caption4"><a href="news_story.php__querystring__id=15518">Powering a Greener Future</a></p> <p class="caption4"><a href="news_story.php__querystring__id=15485">Device That Harvests Water From Air Named Top UMD Invention of the Year</a></p> <p class="caption4"><a href="news_story.php__querystring__id=15456">Maryland Engineering Graduate Programs: Top 10 Among Public Universities, Five Years in a Row</a></p> <p class="caption4"><a href="news_story.php__querystring__id=15447">Electrified Plastic Recycling Toward A Sustainable Future</a></p> <p class="caption4"><a href="news_story.php__querystring__id=15444">Crank Up the AC, Not Global Warming</a></p> <p class="caption4"><a href="news_story.php__querystring__id=15405">Women’s History Month Spotlight</a></p> <p class="caption4"><a href="news_story.php__querystring__id=15393">Safe Lithium Batteries Get a Boost</a></p> <p class="caption4"><a href="news_story.php__querystring__id=15389">2023 Energy Seed Grants Provide Launchpad for Local Startups</a></p> </td></tr> <tr> <td align="left" valign="top"> </td> </tr> </tbody></table> </td> </tr> </tbody></table> </div> <script> // Code to style news from ENG news engine $(document).ready(function(){ // removes title bullet $('#titleTable tr:first-child td:first-child').hide(); // removes spacing above title $('#containerTable tr:first-child td:first-child br:first-of-type').hide(); // adds page-header css rule to title block $('.pageHeader').addClass('page-header'); // removes spacing to the left of the news story $('#containerTable tr:first-child td:nth-child(1)').css('width:700px'); $('#containerTable tr:first-child td:nth-child(3)').hide(); // replace the Next Story link $('#previousNext td').show(); // Format side headlines to match our site dimensions $('#containerTable tr:first-child td:nth-child(4)').css('width', '220'); $('#currentHeadlines').attr('cellpadding', '0'); $('#currentHeadlines .rightHeader').addClass('nanocenter-module-header'); // Help the right table consistently reach the bottom of page $('#currentHeadlines').height($('#containerTable').height()+100); // Add News Resources for consistency and backtrack links var nr = '<p class="rightHeader nanocenter-module-header">News Resources</p>'+ '<p class="caption4"><a href="/news/">Newsroom</a></p>'+ '<p class="caption4"><a href="/news/news_search.php">Search Nano News</a></p>'+ '<p class="caption4"><a href="/news/news_archives.php">Archived News</a></p>'+ '<p class="caption4"><a href="/news/press_releases.php">Press Releases</a></p>'+ '<p class="caption4"><a href="http://feed.eng.umd.edu/news/nano/feed.xml" class="rss-link">NanoCenter RSS</a></p>'; $('#currentHeadlines tr:first-child td:last-child').append(nr); }); </script> <!-- CONTENT END --> <div class="clear"></div> </div> <div class="clear"></div> <div class="container_16" id="site-info"> <p><span class="footer-section-head">Colleges</span> <a href="../../www.eng.umd.edu/index.html">A. 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