论文标题
在硅波导周期性晶格中设计强大的短波布里鲁因声子
Designing of strongly confined short-wave Brillouin phonons in silicon waveguide periodic lattices
论文作者
论文摘要
我们提出了一种优化的可行波导设计，用于用长寿命的声子利用刺激的布里群散射。该设计由一个完全悬浮的山脊波导组成，该波导被1D语音晶体包围，该晶体会减轻对基板的损失，同时提供所需的同质性，以构建光学机械相互作用。这些结构的耦合因子的耦合因子被计算为0.54（W.M）$^{ - 1} $，用于后向后的Brillouin散射，其基本的Te样模式和4.5（W.M）$^{ - 1} $用于amoodal thermodal forther Brillouin Brillouin散射。在仅五个单位细胞之后，语音晶体的添加提供了机械位移的30 dB衰减，这可能导致一个仅受到制造限制声学损失的制度。结果，与耦合和声学质量因子的乘积成正比的Brillouin增益名义上等于理想化的完全悬浮的波导。
We propose a feasible waveguide design optimized for harnessing Stimulated Brillouin Scattering with long-lived phonons. The design consists of a fully suspended ridge waveguide surrounded by a 1D phononic crystal that mitigates losses to the substrate while providing the needed homogeneity for the build-up of the optomechanical interaction. The coupling factor of these structures was calculated to be 0.54 (W.m)$^{-1}$ for intramodal backward Brillouin scattering with its fundamental TE-like mode and 4.5(W.m)$^{-1}$ for intramodal forward Brillouin scattering. The addition of the phononic crystal provides a 30 dB attenuation of the mechanical displacement after only five unitary cells, possibly leading to a regime where the acoustic losses are only limited by fabrication. As a result, the total Brillouin gain, which is proportional to the product of the coupling and acoustic quality factors, is nominally equal to the idealized fully suspended waveguide.
