Adjoint-optimized nanoscale light extractor for nitrogen-vacancy centers in diamond
Adjoint-optimized nanoscale light extractor for nitrogen-vacancy centers in diamond
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DOI：
10.1515/nanoph-2020-0387
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发表时间：
2020-07
期刊：
影响因子：
7.5
通讯作者：
R. Wambold;Zhaoning Yu;Yuzhe Xiao;Benjamin Bachman;G. Jaffe;S. Kolkowitz;J. Choy;M. Eriksson;R. Hamers;M. Kats
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文献类型：
--
作者：
R. Wambold;Zhaoning Yu;Yuzhe Xiao;Benjamin Bachman;G. Jaffe;S. Kolkowitz;J. Choy;M. Eriksson;R. Hamers;M. Kats
摘要我们设计了一种纳米级光萃取器(NLE)，用于对块状金刚石中带负电荷的浅层氮空位(NV)中心发射的宽带光进行有效的输出耦合和光束传输。NLE由钻石表面的图案化硅层组成，不需要对钻石表面进行蚀刻。我们的设计过程基于使用宽带时域模拟的伴随优化，并产生对定位和制造误差具有内在健壮性的结构。我们的NLE功能类似于NV中心的发射天线，将从位于钻石表面下方10 nm处的NV中心提取的光功率提高35倍以上，并将光照射到远场中的±30°锥体中。这种光提取方法可以很容易地适用于其他固态色心。
Abstract We designed a nanoscale light extractor (NLE) for the efficient outcoupling and beaming of broadband light emitted by shallow, negatively charged nitrogen-vacancy (NV) centers in bulk diamond. The NLE consists of a patterned silicon layer on diamond and requires no etching of the diamond surface. Our design process is based on adjoint optimization using broadband time-domain simulations and yields structures that are inherently robust to positioning and fabrication errors. Our NLE functions like a transmission antenna for the NV center, enhancing the optical power extracted from an NV center positioned 10 nm below the diamond surface by a factor of more than 35, and beaming the light into a ±30° cone in the far field. This approach to light extraction can be readily adapted to other solid-state color centers.