Rakhlin Maxim, Sorokin Sergey, Kazanov Dmitrii, Sedova Irina, Shubina Tatiana, Ivanov Sergey, Mikhailovskii Vladimir, Toropov Alexey
Ioffe Institute, 194021 St. Petersburg, Russia.
Faculty of Physics, St. Petersburg State University, 199034 St. Petersburg, Russia.
Nanomaterials (Basel). 2021 Apr 3;11(4):916. doi: 10.3390/nano11040916.
We report on single photon emitters for the green-yellow spectral range, which comprise a CdSe/ZnSe quantum dot placed inside a semiconductor tapered nanocolumn acting as a multimode nanoantenna. Despite the presence of many optical modes inside, such a nanoantenna is able to collect the quantum dot radiation and ensure its effective output. We demonstrate periodic arrays of such emitters, which are fabricated by focused ion beam etching from a II-VI/III-V heterostructure grown using molecular beam epitaxy. With non-resonant optical pumping, the average count rate of emitted single photons exceeds 5 MHz with the second-order correlation function g(2)(0) = 0.25 at 220 K. Such single photon emitters are promising for secure free space optical communication lines.
我们报道了用于绿黄色光谱范围的单光子发射器，其由置于充当多模纳米天线的半导体锥形纳米柱内的CdSe/ZnSe量子点组成。尽管内部存在许多光学模式，但这种纳米天线能够收集量子点辐射并确保其有效输出。我们展示了这种发射器的周期性阵列，其通过聚焦离子束蚀刻由使用分子束外延生长的II-VI/III-V异质结构制成。在非共振光泵浦下，发射的单光子的平均计数率超过5 MHz，在220 K时二阶关联函数g(2)(0)=0.25。这种单光子发射器有望用于安全的自由空间光通信线路。
