Mukai Kohki, Uchiyama Kyosuke, Iwata Kohei, Pribyl Issei
Graduate School of Engineering Science, Yokohama National University, Yokohama 240-8501, Japan.
Nanomaterials (Basel). 2025 Feb 21;15(5):335. doi: 10.3390/nano15050335.
We propose a simple and innovative configuration consisting of a quantum dot and micro-optical resonator that emits single photons with good directionality in a plane parallel to the substrate. In this device, a single quantum dot is placed as a light source between the slits of a triangular split-ring micro-optical resonator (SRR) supported in an optical polymer film with an air-bridge structure. Although most of the previous single photon emitters in solid-state devices emitted photons upward from the substrate, operation simulations confirmed that this configuration realizes lateral light emission in narrow regions above, below, left, and right in the optical polymer film, despite the absence of a light confinement structure such as an optical waveguide. This device can be fabricated using silica-coated colloidal quantum dots, focused ion beam (FIB) lithography, and wet etching using an oxide layer on a silicon substrate as a sacrificial layer. The device has a large tolerance to the variation in the position of the SRR in the optical polymer film and the height of the air-bridge. We confirmed that Pt-SRRs can be formed on the optical polymer film using FIB lithography. This simple lateral photon emitter is suitable for coupling with optical fibers and for fabricating planar optical quantum solid-state circuits, and is useful for the development of quantum information processing technology.
我们提出了一种简单且创新的结构，它由一个量子点和微光学谐振器组成，能在与衬底平行的平面内以良好的方向性发射单光子。在该器件中，单个量子点作为光源置于支撑在具有空气桥结构的光学聚合物薄膜中的三角形裂环微光学谐振器（SRR）的狭缝之间。尽管此前固态器件中的大多数单光子发射器是从衬底向上发射光子，但运行模拟证实，这种结构实现了在光学聚合物薄膜中上方、下方、左侧和右侧的狭窄区域内的横向发光，尽管没有诸如光波导之类的光限制结构。该器件可以使用二氧化硅包覆的胶体量子点、聚焦离子束（FIB）光刻技术以及以硅衬底上的氧化层作为牺牲层的湿法蚀刻来制造。该器件对光学聚合物薄膜中SRR的位置变化以及空气桥的高度具有很大的容忍度。我们证实了可以使用FIB光刻技术在光学聚合物薄膜上形成铂基SRR。这种简单的横向光子发射器适用于与光纤耦合以及制造平面光学量子固态电路，并且对量子信息处理技术的发展很有用。
