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首页> 外文期刊>Optics Letters >Efficient excitation of photoluminescence in a two-dimensional waveguide consisting of a quantum dot-polymer sandwich-type structure
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Efficient excitation of photoluminescence in a two-dimensional waveguide consisting of a quantum dot-polymer sandwich-type structure

机译：在由量子点-聚合物夹心型结构组成的二维波导中有效激发光致发光

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In this Letter, we study a new kind of organic polymer waveguide numerically and experimentally by combining an ultrathin (10-50 nm) layer of compactly packed CdSe/ZnS core/shell colloidal quantum dots (QDs) sandwiched between two cladding poly(methyl methacrylate) (PMMA) layers. When a pumping laser beam is coupled into the waveguide edge, light is mostly confined around the QD layer, improving the efficiency of excitation. Moreover, the absence of losses in the claddings allows the propagation of the pumping laser beam along the entire waveguide length; hence, a high-intensity photoluminescence (PL) is produced. Furthermore, a novel fabrication technology is developed to pattern the PMMA into ridge structures by UV lithography in order to provide additional light confinement. The sandwich-type waveguide is analyzed in comparison to a similar one formed by a PMMA film homogeneously doped by the same QDs. A 100-fold enhancement in the waveguided PL is found for the sandwich-type case due to the higher concentration of QDs inside the waveguide.
机译：在这封信中，我们通过组合夹在两个包层聚甲基丙烯酸甲酯之间的紧密堆积的CdSe / ZnS核/壳胶体量子点（QD）的超薄（10-50 nm）层，在数值和实验上研究了一种新型的有机聚合物波导）（PMMA）层。当泵浦激光束耦合到波导边缘时，光大部分被限制在QD层周围，从而提高了激发效率。而且，在包层中不存在损耗，使得泵浦激光束可以沿整个波导长度传播。因此，产生了高强度的光致发光（PL）。此外，开发了一种新颖的制造技术，以通过UV光刻将PMMA图案化为脊结构，以提供更多的光限制。与由相同QD均匀掺杂的PMMA膜形成的类似波导相比，对夹层波导进行了分析。对于三明治型情况，由于波导内部QD的浓度较高，因此波导PL的增强100倍。

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