Distributed feedback laser with methylammonium lead bromide embedded in channel-type waveguides
Distributed feedback laser with methylammonium lead bromide embedded in channel-type waveguides
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DOI：
10.35848/1347-4065/abdb7f
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发表时间：
2021-05-01
影响因子：
1.5
通讯作者：
Yanagi, Hisao
中科院分区：
文献类型：
--
作者：
Mizuno, Hitoshi;Nishimura, Takumi;Yanagi, Hisao
分布式反馈（DFB）激光是通过嵌入通道型波导中的 CH3NH3PbBr3 钙钛矿实现的。通过使用聚焦离子束，DFB 光栅被雕刻在 SiO2/Si 晶圆上蚀刻的通道型波导的底面内。带有DFB光栅的波导内结晶的定向CH3NH3PbBr3在横向和法向方向上显示出二阶DFB激光模式，其阈值激发密度为47μJ cm(-2)，比非DFB激光器中的阈值激发密度低一个数量级。时域有限微分计算很好地再现了分裂的 DFB 峰值。当激发通量增加到远高于阈值时，峰值变为功率展宽的放大自发发射。
Distributed feedback (DFB) lasing is achieved with CH3NH3PbBr3 perovskite embedded in channel-type waveguides. By using a focused ion beam, DFB gratings are engraved within the bottom surface of channel-type waveguides etched on a SiO2/Si wafer. The oriented CH3NH3PbBr3 crystallized inside the waveguide with the DFB gratings shows second-order DFB lasing mode in lateral and normal directions above a threshold excitation density of 47 mu J cm(-2) which is one order of magnitude lower than that in the non-DFB laser. The splitting DFB peaks are well reproduced by finite-differential time-domain calculation. The peaks change to a power-broadened amplified spontaneous emission as the excitation fluence is increased far above the threshold.