Developing ultralow threshold nanolasers is a challenging task despite of their great potential for a variety of applications. This work proposes to combine the advantages of low loss of dielectric materials and tight confinement of field in slotted dielectric nanodisks with gain medium embedded to them and supported by metallic substrate, which generates anapole mode with a lifetime longer than for dielectric substrate. Since the dielectric nanocavity has intrinsically low loss, one can achieve lasing with ultralow threshold down to 0.02 pJ for a spot size 1.5 μm of pump, several orders-of-magnitude lower than the preceding records. Dielectric slotted disk nanolasers proposed here can find broad applications for biosensing, near-field spectroscopy, and many other fields.

中文翻译：

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超低泵浦阈值的介电开槽纳米盘激光器，由anapole 激发

尽管超低阈值纳米激光器在各种应用中具有巨大潜力，但开发超低阈值纳米激光器仍是一项具有挑战性的任务。这项工作建议结合电介质材料的低损耗和狭缝电介质纳米盘中场的严格限制的优点，增益介质嵌入其中并由金属基板支撑，产生寿命比电介质基板更长的倒极模式。由于介电纳米腔本质上具有低损耗，因此对于 1.5 μm 的泵浦光斑尺寸，可以实现低至 0.02 pJ 的超低阈值的激光发射，比之前的记录低几个数量级。这里提出的介电开槽盘纳米激光器可以在生物传感、近场光谱学和许多其他领域找到广泛的应用。