论文标题
原子薄的黄色珍珠：用于热非线性光学效应的动力辅助连续波随机激光
Atomically Thin Yellow Pearl: An Impetus for Thermal Nonlinear Optical Effect Assisted Continuous Wave Random Lasing
论文作者
论文摘要
在低温温度之上，连续波（CW）下的随机激光（RL）发射对于具有大量晶格缺陷的材料通常具有挑战性。因此，制造RL设备时需要重症监护。在此类设备中使用具有独特功能的2D材料的合成。在这项工作中，使用液相去角质（LPE）技术从散装的南海珍珠合成了无缺陷的2D黄色珍珠（2D-imp）。此后，已使用2D-EMP作为被动散射器，以实现从常规增益分子（即Rhodamine b（Rhb））中泵送的RL发射。与其他半导体（TIO2）和2D（石墨烯和H-BN）被动散射器相比，对于由RHB和2D-ESP组成的无序系统，即2D-YP@RHB观察到了约25倍的增益体积，这是由于较大的避热性梯度的形成，这是由于optrical themal themal themal themal themal themal themal the theal nonline the而形成的。因此，据报道，在最低阈值输入泵功率和65 mW和3 nm的线宽时，报告了2D-emb的不连贯RL（IC-RL）发射〜591 nm。另外，还可以通过更改2D-ip@rhb容器的配置，从IC-RL到模式可调节相干RL（C-RL）发射也可以进行清晰的过渡。因此，新设计的范德华异质结构，即具有固有光子捕获能力的2D-EST可能铺平了开发未来令人兴奋的光电设备的途径。
Above cryogenic temperatures, random laser (RL) emission under continuous wave (CW) optical pumping is often challenging for materials having plenty of lattice defects. Thus, intensive care is required while fabricating the RL device. Synthesis of 2D materials having unique functionality at the atomic limit is necessary for use in such devices. In this work, defects-free 2D yellow pearl (2D-YP) has been synthesized from bulk south sea pearl using liquid-phase exfoliation (LPE) technique. Thereafter, 2D-YP has been employed as passive scatterer to achieve CW pumped RL emission from a conventional gain molecule, i.e., Rhodamine B (RhB). Compared to other semiconductor (TiO2) and 2D (Graphene and h-BN) passive scatterers, ~25 times improvement in gain volume is observed for the disordered system consisting of RhB and 2D-YP, i.e., 2D-YP@RhB, which is found to be due to the formation of a large refractive index gradient, as induced by the thermal nonlinear optical (NLO) interaction. Hence, incoherent RL (ic-RL) emission ~591 nm is reported for 2D-YP@RhB at a lowest threshold input pump power and a linewidth of 65 mW and 3 nm, respectively. Additionaly, a clear transition from ic-RL to mode tunable coherent RL (c-RL) emission is also possible by altering the configuration of the 2D-YP@RhB container. Therefore, the newly designed Van der Waals heterostructure, i.e., 2D-YP with intrinsic photon trapping capability may pave an avenue towards developing future exciting optoelectronic devices.
