Controlling the electric and magnetic dipole moments of optical nanostructures is a fundamental prerequisite for light routing and polarization multiplexing at the nanoscale. A versatile approach for inducing tailored dipole moments is structured illumination. Here, we discuss the excitation of a chiral dipole moment in an achiral silicon nanoparticle. In particular, we make use of the electric and magnetic polarizabilities of the silicon nanoparticle to coherently excite a superposition of parallel electric and magnetic dipole moments phase-shifted by $\pm \pi /2$, which resembles the fundamental mode of a three-dimensional chiral nanostructure. We demonstrate the wavelength dependence of the excitation scheme and measure the spin and orbital angular momenta in the emission of the induced chiral dipole moments. Our results highlight the capabilities of such tunable chiral dipole emitters—not limited by structural properties—as flexible sources of spin-polarized light for nanoscopic devices.

中文翻译：

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在非手性纳米结构中激发手性偶极矩

控制光学纳米结构的电偶极矩和磁偶极矩是在纳米级进行光路由和偏振复用的基本先决条件。诱导量身定制的偶极矩的一种通用方法是结构化照明。在这里，我们讨论了非手性硅纳米粒子中手性偶极矩的激发。特别是，我们利用硅纳米粒子的电和磁极化率来相干地激发相移了相移的平行电和磁偶极矩的叠加。$\pm \pi /\mathrm{2个}$，类似于三维手性纳米结构的基本模式。我们证明了激发方案的波长依赖性，并测量了诱导手性偶极矩发射中的自旋和轨道角动量。我们的结果突出了这种可调性手性偶极子发射器的功能，不受纳米结构器件的限制，它具有灵活的自旋偏振光源的能力。