Demonstration of valley spin devices by coupling 2D semiconductors to chiral photonic crystal nanocavities

通过将二维半导体耦合到手性光子晶体纳米腔来演示谷自旋器件

基本信息

批准号：
22K14623
负责人：
Fong CheeFai
金额：
$ 3万
依托单位：
Institute of Physical and Chemical Research
依托单位国家：
日本
项目类别：
Grant-in-Aid for Early-Career Scientists
财政年份：
2022
资助国家：
日本
起止时间：
2022-04-01 至 2024-03-31
项目状态：
已结题

项目摘要

Based on our simulation results, we have fabricated H1 photonic crystal (PhC) cavities with silicon and characterized their optical characteristics by measuring the photoluminescence (PL) from the cavity. From our measurement results, the cavity resonant wavelengths and quality factor are consistent with our numerical simulations. In principle, the H1 PhC cavity has two degenerate dipole modes. However, as fabrication errors are avoidable, the spectral degeneracy of the modes are lifted resulting in the observation of two peaks in the PL spectra. The magnitude of the peak splitting varies from cavity to cavity. Results from our current sample will be used as feedback for our next fabrication in order to reduce fabrication error and thus improve the mode degeneracies.On the other hand, we intend to heterogeneously integrate 2D van der Waals material on the photonic crystal. We have further developed the technologies related to 2D materials. In particular, we carried out 2D materials exfoliation and transfer using combinations of polydimethylsiloxane (PDMS), anthracene and hexagonal boron nitride (hBN) flakes.We also developed a novel type of photonic crystal cavity, namely the 2D material-induced nanocavity in a photonic crystal waveguide. A 2D material flake of a suitable width can provide a small local refractive index modulation to induce the formation of a cavity in a PhC waveguide at wherever the 2D material is placed. We confirmed the feasibility of such method by FDTD and FEM simulations.

根据我们的仿真结果，我们用硅制造了H1光子晶体（PHC）腔，并通过测量腔体的光致发光（PL）来表征其光学特性。从我们的测量结果中，空腔谐振波长和质量因子与我们的数值模拟一致。原则上，H1 PHC腔具有两个简并偶极模式。然而，由于可以避免制造误差，因此模式的频谱退化性被提升，从而观察到PL光谱中的两个峰。峰分裂的幅度因腔到腔而异。我们当前样品的结果将用作下一次制造的反馈，以减少制造误差，从而改善模式变性。另一方面，我们打算异质地整合光子晶体上的2D van der waals材料。我们进一步开发了与2D材料相关的技术。特别是，我们使用聚二甲基硅氧烷（PDMS），蒽和六边形硝酸硼（HBN）片的组合进行了2D材料去角质和转移。我们还开发了一种新型的光子晶体腔，即2D材料诱导的纳米型纳米型纳米腔均具有光电晶体晶体晶体晶体晶体晶体晶体晶体晶体晶体波盖。合适宽度的2D材料薄片可以提供一个小的局部折射率调制，以诱导在放置2D材料的PHC波导中形成腔体的形成。我们通过FDTD和FEM模拟证实了这种方法的可行性。