Rare-earth optical materials with large optical gain are of great importance for a wide variety of applications in photonics and quantum information due to their long carrier lifetimes and quantum coherence times, especially in the realization of efficient lasers and amplifiers. Until now, such materials have achieved a gain of less than a few dB cm^–1, rendering them unsuitable for applications in nanophotonic integrated circuits. Here, we report the results of the signal enhancement and transmission experiments on a single-crystal erbium chloride silicate nanowire. Our experiments demonstrate that a net material gain over 100 dB cm^–1 at wavelengths around 1,530 nm is possible due to the nanowire's single-crystalline material quality and its high erbium concentration. Our results establish that such rare-earth-compound nanowires are a potentially important class of nanomaterials for a variety of applications including, for example, subwavelength-scale optical amplifiers and lasers for integrated nanophotonics, and quantum information.

中文翻译：

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单晶氯化er硅酸盐纳米线的巨大光学增益

具有高光学增益的稀土光学材料由于其较长的载流子寿命和量子相干时间，特别是在实现高效的激光器和放大器中，对于光子学和量子信息中的各种应用非常重要。到目前为止，此类材料的增益不到几dB cm ^–1，使其不适合用于纳米光子集成电路。在这里，我们报告了单晶氯化chloride硅酸盐纳米线的信号增强和传输实验的结果。我们的实验表明，净材料增益超过100 dB cm ^–1由于纳米线的单晶材料质量及其较高的concentration浓度，因此可能在1,530 nm左右的波长处进行发射。我们的研究结果表明，这种稀土化合物纳米线是潜在的重要一类纳米材料，适用于各种应用，例如亚波长级光学放大器和用于集成纳米光子的激光器以及量子信息。