声等离激元环形纳米螺旋桨中的光子与声子模式
Photonic and phononic modes in acoustoplasmonic toroidal nanopropellers
AI总结：
该研究针对由三瓣二维形状沿扭转角α的螺旋扫掠生成的环形纳米螺旋桨金属颗粒，发现其光子与声子共振均随α红移，揭示了光学共振的螺旋长度演化机制与声学新低频共振的色散竞争规律。
摘要：
在具有环形纳米螺旋桨几何结构的金属颗粒中，发现了声学和光子学领域的非常规共振；该结构通过将三瓣二维形状沿扭转角为$\alpha$的螺旋线扫掠生成。在光学和声学两种情形下，共振的光谱位置均随$\alpha$变化发生红移。我们证明，光学情形可理解为共振随环形纳米螺旋桨的螺旋长度随$\alpha$增加的自然演化，这意味着存在巨大的依赖于螺旋度的吸收截面。在声学响应方面，识别出两种发生红移的呼吸模式。此外，即使很小的$\alpha$也能产生新的低频共振，其光谱色散取决于生成螺旋的长度与环形纳米螺旋桨螺距之间的竞争关系。
英文摘要：
Non-conventional resonances, both acoustic and photonic, are found in metallic particles with a toroidal nanopropeller geometry that is generated by sweeping a three-lobed 2D-shape along a spiral with twisting angle, $α$. For both optical and acoustic cases, spectral location of resonances experiences a red-shift as a function of $α$. We demonstrate that the optical case can be understood as a natural evolution of resonances as the spiral length of the toroidal nanopropeller increases with $α$, implying a huge helicity dependent absorption cross section. In the case of acoustic response, two red-shifting breathing modes are identified. Additionally, even small $α$ allows the appearance of new low-frequency resonances, whose spectral dispersion depends on a competition between length of the generative spiral and the pitch of the toroidal nanopropeller.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
