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type="text/css"></style> <div id="ct" class="ct2 wp cl"> <div class="mn"> <div class="bm_haa cl"> <div class="bm_h cl"> <a href="http://www.oecr.com/portal.php?mod=rss&catid=58" class="y xi2 rss" target="_blank" title="RSS">订阅</a><h1 class="xs2">文章</h1> </div></div> <div class="kjkjb"> <div class="bm vw" style="margin-bottom:0;"> <div class="h hm"> <div class="zxtoux"><img src="http://www.oecr.com/uc_server/avatar.php?uid=54876&size=small" /></div> <h1 class="ph">利用机器学习将光学传感器灵敏度提高到单分子水平 </h1> <p class="xg1"> 时间：2018-10-11 10:12<a class="zz" href="home.php?mod=space&uid=54876">作者：update</a> 阅读<em id="_viewnum">(696)</em> 评论: <a href="http://www.oecr.com/portal.php?mod=comment&id=7138&idtype=aid" title="查看全部评论"><em id="_commentnum">5</em></a></p> <div class="zxfb" ><a href="http://www.oecr.com/portal.php?mod=rss&catid=58" class="y xi2 rss" target="_blank" title="RSS">订阅</a></div> </div> <!--[diy=diysummarytop]--><div id="diysummarytop" class="area"></div><!--[/diy]--> <div class="s"> <div class="ss"><div><span>导读： </span>纳米结构的几何形状只要满足特定条件，并匹配入射光的波长，就能够大幅提高光学传感器的灵敏度。这是因为局部纳米结构可以极大地放大或减少光的电磁场。</div> </div> <!--[diy=diysummarybottom]--><div id="diysummarybottom" class="area"></div><!--[/diy]--> <div class="d"> <!--[diy=diycontenttop]--><div id="diycontenttop" class="area"></div><!--[/diy]--> <table cellpadding="0" cellspacing="0" class="vwtb"><tr><td id="article_content"><div> <a href="http://material.oecr.com" target="_blank" class="relatedlink">纳米</a>结构的几何形状只要满足特定条件，并匹配入射光的波长，就能够大幅提高光学<a href="http://sensor.oecr.com" target="_blank" class="relatedlink">传感</a>器的灵敏度。这是因为局部纳米结构可以极大地放大或减少光的电磁场。据麦姆斯咨询报道，由Christiane Becker教授领导的HZB（德国亥姆霍兹国家研究中心联合会）青年研究组“Nano-SIPPE”正致力于开发这类纳米结构。计算机模拟是进行这类研究的一种重要工具。来自Nano-SIPPE团队的Carlo Barth博士现在已经使用机器学习确定了纳米结构中最重要的场分布模式，并因此首次很好地解释了实验结果。</div><div><br></div><div> 纳米结构上的量子点</div><div><br></div><div> 该团队研究的光子纳米结构由具有规则孔状图案的硅层组成，其上覆有由硫化物制成的量子点涂层。<a href="http://laser.oecr.com" target="_blank" class="relatedlink">激光</a>激发后，接近局部场放大的量子点，比在无序表面上发出了更多的光。这能够在经验上证明激光如何与纳米结构相互作用。</div><div><br></div><div><p style="text-align: center;"><a href="data/attachment/portal/201810/11/101347kq7lrlp5rpgmr75r.jpg" target="_blank"><img src="data/attachment/portal/201810/11/101347kq7lrlp5rpgmr75r.jpg"></a></p></div><div><br></div><div> 计算机模拟<a href="http://display.oecr.com" target="_blank" class="relatedlink">显示</a>了在激光激发后，电磁场如何在具有孔状图案的硅层中分布。如上图所示，形成了具有局部场最大值的条纹，因而量子点能够特别强烈地<a href="http://light.oecr.com" target="_blank" class="relatedlink">发光</a>。</div><div><br></div><div> 利用机器学习发现了十种不同的模式</div><div><br></div><div> 为了系统地记录当纳米结构的各个参数发生变化时会发生什么，Barth利用在柏林Zuse研究所开发的<a href="http://opticaldesign.oecr.com" target="_blank" class="relatedlink">软件</a>计算了每个参数集的三维电场分布。然后，Barth基于机器学习，通过其他计算机程序分析了这些海量数据。</div><div><br></div><div> “计算机搜索了大约45000条数据记录，并将它们分成了大约十种不同的模式，”他解释说。最后，Barth和Becker成功地确定了其中三种基本模式，在这三种基本模式下，光电磁场在纳米孔的各个特定区域被放大了。</div><div><br></div><div> 展望：探测单个分子，例如：癌症标志物</div><div><br></div><div> 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