光誘起相転移を用いたプラズモニック構造・光導波路による超高速全光変調器

使用等离子体结构和光波导的超快全光调制器使用光诱导相变

• 批准号: 19J13644
• 负责人: CLARK JOHN KENJI
• 金额: $ 1.34万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2019
• 资助国家: 日本
• 起止时间: 2019-04-25 至 2021-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-19J13644/
• 关键词: pump-probe spectroscpy; all-optical; vanadium dioxide; niobium dioxide; ultrafast optics

In the previous year, three key objectives were achieved. First, a unique micro-pump probe spectroscopy setup was completed. The setup has the capability of injecting ultrashort laser pulses into photonic integrated circuits and measuring their time-resolved response. Using a spatial filtering system, the setup can also isolate signals output from specific elements of a photonic integrated circuit. Second, the recovery dynamics of VO2 thin films after excitation by an ultrashort laser pulse were studied. A mid-fluence region where VO2 undergoes a full insulator-metal transition while still exhibiting sub-ns recovery was discovered, thus verifying for the first time that VO2 has the potential to be modulated at GHz speeds. Finally, the photo-induced modulation of NbO2 thin films after excitation by an ultrashort laser pulse was studied and the phenomenological origins of the response was examined in detail. It was found that NbO2 has the potential to be modulated at up to THz speeds given proper management of heat dissipation. Based on this work two journal articles were compiled. One was published in December of 2019 (J. Kenji Clark et al., Phys. Rev. Res. 1, 033168 (2019)) and the other is currently under review in ACS Photonics.

在过去一年中，我们实现了三个主要目标。首先，完成了独特的微泵探针光谱设置。该装置具有向光子集成电路注入超短激光脉冲并测量其时间分辨响应的能力。使用空间滤波系统，该装置还可以隔离来自光子集成电路特定元件的信号输出。其次，研究了超短激光脉冲激发后VO2薄膜的恢复动力学。在中间通量区域，VO2经历了完全的绝缘体-金属转变，同时仍然表现出亚ns的回收率，从而首次验证了VO2具有以GHz速度调制的潜力。最后，研究了NbO2薄膜在超短激光脉冲激励下的光致调制，并对其响应的现象学根源进行了详细的探讨。研究发现，在适当的散热管理下，NbO2具有在高达太赫兹速度下被调制的潜力。在此基础上编写了两篇期刊文章。其中一篇发表于2019年12月（J. Kenji Clark et al., Phys）。Rev. Res. 1, 033168(2019))和另一个目前正在ACS Photonics中进行审查。

项目成果

Thresholdless behavior and linearity of the optically induced metallization of NbO2Thresholdless behavior and linearity of the optically induced metallization of NbO2

NbO2 光致金属化的无阈值行为和线性 NbO2 光致金属化的无阈值行为和线性

• DOI: 10.1103/physrevresearch.1.033168
• 发表时间: 2019
• 期刊: Phys. Rev. Research
• 作者: J. Kenji Clark;Ya-Lun Ho;Hiroaki Matsui;Hitoshi Tabata;and Jean-Jacques DelaunayJ. Kenji Clark;Ya-Lun Ho;Hiroaki Matsui;Hitoshi Tabata;and Jean-Jacques Delaunay
• 通讯作者: and Jean-Jacques Delaunay

Optically Pumped Hybrid Plasmonic-Photonic Waveguide Modulator Using the VO2 Metal-Insulator Phase Transition

• DOI: 10.1109/jphot.2017.2784429
• 发表时间: 2018-02-01
• 期刊: IEEE PHOTONICS JOURNAL
• 影响因子: 2.4
• 作者: Clark, J. Kenji;Ho, Ya-Lun;Delaunay, Jean-Jacques
• 通讯作者: Delaunay, Jean-Jacques