Ultra-low threshold and spontaneous emission control in semiconductor microdisk lasers

半导体微盘激光器的超低阈值和自发发射控制

基本信息

批准号：
10450025
负责人：
BABA Toshihiko
金额：
$ 7.3万
依托单位：
Yokohama National University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-10450025/
关键词：
disk laser GaInAs InP spontaneous emission control threshold less laser cavity QED microcavity spontaneous emission factor whispering gallery mode 無しぎ値レーザ共振器OED 周回モードマイクロディスク半導体レーザ Whispering Galleryモード

项目摘要

We obtained the following achievements on microdisk lasers :1. Ultra-small cavity : The injection lasing was obtained in 2-μm-diameter and 0.2-μm-thickness GaInAsP microdisk. The cavity volume is 0.4 μm^3. Although this value is larger than that achieved in a single defect photonic crystal laser, it is still the smallest for injection lasers. Such a small cavity provides various evidences of the spontaneous emission control.2. Ultra-low threshold : I_<th>=40μA was achieved under cw condition, the lowest record for GaInAsP lasers. The effective J_<th> is 320 A/cm_2 (80 A/cm_2 per QW). Key issues for lower threshold are the reduction in scattering loss caused by the roughness in the microdisk, and the balance between the carrier diffusion and the scattering loss at post edges. A threshold less than 10 μA and internal efficiency higher than 50 % will be possible by the engineering of whispering gallery modes, free carrier absorption, strain relaxation in QWs, etc.3. Fragileness : This wil … More l be a problem in future applications. To satisfy both the mechanical strength and optical confinement, a microdisk buried by the selectively oxidized AlInAs claddings was proposed. The depth and the optical absorption in the oxidized claddings are key issues to be investigated.4. Strong optical confinement : The low threshold is obtained by the total internal reflection at microdisk boundaries, which is unsuitable for light extraction. The evanescent coupling of microdisk elements was investigated by the FDTD simulation. Over 60 % extraction efficiency is expected by the <0.3 μm space between the microdisk elements.5. Evanescent field spreading around the microdisk : This feature can be used in a near field probe sensor. The lasing characteristic is modulated by the surface profile of an object put close to the microdisk. A spatial resolution of 〜λ/10 were expected theoretically and experimentally. The scanning microscopy against metal and dielectric objects was demonstrated by the use of this active probe. Less

我们在微台面激光器上获得了以下成就：1。超小腔：在2μm直径和0.2μm-厚度Gainasp Microdisp中获得注射激光。腔体积为0.4μm^3。尽管该值大于在单个缺陷光子晶体激光器中实现的值，但它仍然是注射激光器最小的值。如此小的空腔提供了赞助发射控制的各种证据。2。超低阈值：I_ <th> =40μa在CW条件下达到了最低的GANASP激光器记录。有效的J_ <th>为320 A/CM_2（每QW 80 A/CM_2）。较低阈值的关键问题是由微型风险的粗糙度以及载体扩散与后边缘处的散射损失之间的平衡造成的散射损失减少。通过低语画廊模式，自由载体吸收，QWS中的应变松弛等，将可能实现小于10μA的阈值和高于50％的内部效率。3。脆弱性：这会在未来的应用中成为一个问题。为了满足机械强度和光学限制，提出了由选择性氧化的Alinas claddings构建的微型遇险。氧化壁板中的深度和光吸收是要研究的关键问题4。强烈的光学限制：低阈值是通过在微视孔边界处的总内部反射获得的，这不适合萃取。通过FDTD仿真研究了微视元元素的诱发偶联。微型元素之间的<0.3μm空间预期超过60％的提取效率5。 evanevenscent在微台面周围扩散：此功能可在近场探针传感器中使用。激光特性是由一个靠近微型风险的对象的表面曲线调节的。预期的理论和实验可以预期〜λ/10的空间分辨率。通过使用该活性探针，证明了针对金属和顽固物体的扫描显微镜。较少的