Optofluidic Lasers with Aqueous Quantum Dots
Optofluidic Lasers with Aqueous Quantum Dots
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DOI：
10.1021/acsphotonics.5b00211
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发表时间：
2015-05
期刊：
影响因子：
7
通讯作者：
A. Kiraz;A. Kiraz;Qiushu Chen;Xudong Fan
中科院分区：
文献类型：
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作者：
A. Kiraz;A. Kiraz;Qiushu Chen;Xudong Fan
我们使用相同的高Q因子光流控环形谐振器(OFRR)平台实现了两种类型的水相量子点(QD)的激光发射。在第一种类型中，2个μM量子点在体缓冲液中填充整个OFRR腔体积。激光阈值为0.1mJ/μ，比最先进水平低3个数量级以上。在第二类激光器中，量子点以单层的形式固定在脉冲激光二极管内壁与缓冲液的界面上，表面密度低至3×10~9~10~(10)cm~(-2)，激光阈值为60μJ/mm~2。在整体溶液和单层激光情况下，即使在远高于相应激光阈值的5-10分钟不间断脉冲光激发下，激光发射也保持不变，这表明量子点激光器具有很高的光稳定性。这与有机染料激光器形成了鲜明的对比，后者在类似的泵浦条件下，在激光操作过程中经历了快速光漂白。并进行了理论分析。
We achieved two types of laser emissions from aqueous quantum dots (QDs) using the same high-Q-factor optofluidic ring resonator (OFRR) platform. In the first type, 2 μM QDs were in bulk buffer solution that filled the entire OFRR cavity volume. The lasing threshold was 0.1 μJ/mm2, over 3 orders of magnitude lower than the state-of-the-art. In the second type of laser, the QDs were immobilized as a single layer on the interface between the OFRR inner wall and buffer solution with a surface density as low as 3 × 109–1010 cm–2. The lasing threshold of 60 μJ/mm2 was achieved. In both bulk solution and single-layer lasing cases, the laser emission persisted even under 5–10 min of uninterrupted pulsed optical excitation that was well above the corresponding lasing threshold, indicative of high photostability of the QD laser. This was in sharp contrast to organic-dye-based lasers, which underwent quick photobleaching during the laser operation under similar pumping conditions. Theoretical analysis is also carri...