Direct laser writing of graded-index SiGe waveguides via phase segregation

Direct laser writing of graded-index SiGe waveguides via phase segregation
复制标题

通过相位分离直接激光写入渐变折射率 SiGe 波导

DOI:
10.1117/12.2575437
复制
发表时间:
2021
期刊:
--
影响因子:
--
通讯作者:
Aktas O
Aktas O
中科院分区:
--
文献类型:
--
作者:
Aktas O

文献摘要

参考文献

相似文献

我们报道了在硅衬底外延生长的初始均质硅锗(SiGe)薄膜中,通过相偏析直接激光写入渐变折射率光波导。我们使用连续波(CW)激光器,工作波长为532 nm。激光束聚焦在厚度为575 nm、锗浓度为50%的SiGe薄膜表面直径为5 μm的光斑上。通过熔化表面诱导SiGe膜的成分分离,并在0.1 ~ 200 mm/s范围内控制激光诱导熔融区的扫描速度,从而定制出SiGe膜的成分轮廓。在高扫描速度下,扫描激光束会产生一个移动的富含Ge的熔融区,在那里,由于扩散不足限制了Ge的传输,Ge含量会在后缘积聚。材料表征表明,激光加工的SiGe微条纹由富Ge的条形核心(> 70% Ge)和富si的下包层(<30% Ge)组成。扫描速度相关的相位偏析允许制造具有可调成分剖面的梯度折射率SiGe波导,这些波导通过光学传输测量和模态分析进行了表征。我们的方法也可以应用于具有与SiGe合金相似的平衡相图的三元半导体(AlGaAs)伪二元合金。
We report direct laser writing of graded-index optical waveguides via phase segregation in initially homogenous silicongermanium (SiGe) thin films epitaxially-grown on silicon substrates. We used a continuous wave (CW) laser operating at a wavelength of 532 nm. The laser beam was focused to a 5 μm diameter spot on the surface of SiGe films with a thickness of 575 nm and a Ge concentration of %50. Compositional separation of a SiGe film was induced by melting the surface, and the composition profile was tailored by controlling the scan speed of the laser-induced molten zone in a range of 0.1-200 mm/s. At high scan speeds, scanning the laser beam produces a travelling Ge-rich molten zone, where a build-up of Ge content occurs at the trailing edge because of insufficient diffusion-limited Ge transport. Material characterizations have revealed that the laser-processed SiGe microstripes consist of Ge-rich strip cores (> 70% Ge) surrounded by Si-rich under-claddings (<30% Ge). Scan-speed dependent phase segregation allows for fabrication of graded-index SiGe waveguides with tunable compositional profiles, which were characterized by optical transmission measurements, and modal analysis using simulations. Our method could also be applied to pseudo-binary alloys of ternary semiconductors (AlGaAs), which have equilibrium phase diagrams similar to that of SiGe alloys.
h = 1.3 pm 和 h = 1.55 pm 的硅中锗扩散波导,损耗低于 0.5 dB/cm
DOI: --
发表时间: 1992
期刊:
影响因子: --
作者:
J. Schmidtchen;B. Schiippert;A. Splett;K. Petermann
通讯作者: K. Petermann
2.15 µm 处 SiGe 梯度波导的折射率分布的 Mlines 表征。
DOI: --
发表时间: 2013
期刊: Optics Express
影响因子: 3.8
作者:
P. Barritault;M. Brun;P. Labeye;O. Lartigue;J. Hartmann;S. Nicoletti
通讯作者: S. Nicoletti
DOI: --
发表时间: 2012
期刊:
影响因子: --
作者:
G. Pethuraja;R. Welser;A. Sood;Changwoo Lee;N. Alexander;H. Efstathiadis;P. Haldar;J. L. Harvey
通讯作者: J. L. Harvey
DOI: 10.1364/oe.394871
发表时间: 2020-06-08
期刊: OPTICS EXPRESS
影响因子: 3.8
作者:
Chen, Xia;Milosevic, Milan M.;Reed, Graham T.
通讯作者: Reed, Graham T.
SiGe/Si 光通道波导中局部应力分布的映射
DOI: --
发表时间: 2001
期刊:
影响因子: --
作者:
H. Rho;H. Jackson;B. Weiss
通讯作者: B. Weiss