We investigate intermodal forward Brillouin scattering in a solid-core photonic crystal fiber (PCF), demonstrating efficient power conversion between the HE₁₁ and HE₂₁ modes, with a maximum gain coefficient of 21.4 W⁻¹ km⁻¹. By exploring mechanical modes of different symmetries, we observe both polarization-dependent and polarization-independent intermodal Brillouin interaction. Finally, we discuss the role of squeeze film air damping and leakage mechanisms, ultimately critical to the engineering of PCF structures with enhanced interaction between high-order optical modes through flexural mechanical modes.

中文翻译：

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固核光子晶体光纤中的多峰布里渊散射

我们研究了固态核光子晶体光纤（PCF）中的多 峰前布里渊散射，证明了HE ₁₁和HE ₂₁模式之间的有效功率转换，最大增益系数为21.4 W ^-1 km ^-1。通过探索不同对称性的机械模式，我们观察了偏振相关和偏振无关的联运布里渊相互作用。最后，我们讨论了挤压膜空气阻尼和泄漏机制的作用，这对于通过弯曲机械模式增强高阶光学模式之间的相互作用对PCF结构的工程至关重要。