Superhybrid Mode-Enhanced Optical Torques on Mie-Resonant Particles
| Autor: | Yuzhi Shi, Lei-Ming Zhou, Ai Qun Liu, Manuel Nieto-Vesperinas, Tongtong Zhu, Amir Hassanfiroozi, Jingquan Liu, Hui Zhang, Din Ping Tsai, Hang Li, Weiqiang Ding, Weiming Zhu, Ye Feng Yu, Alfredo Mazzulla, Gabriella Cipparrone, Pin Chieh Wu, C. T. Chan, Cheng-Wei Qiu |
|---|---|
| Rok vydání: | 2022 |
| Předmět: | |
| Zdroj: | Nano Letters. 22:1769-1777 |
| ISSN: | 1530-6992 1530-6984 |
| Popis: | Circularly polarized light carries spin angular momentum, so it can exert an optical torque on the polarization-anisotropic particle by the spin momentum transfer. Here, we show that giant positive and negative optical torques on Mie-resonant (gain) particles arise from the emergence of superhybrid modes with magnetic multipoles and electric toroidal moments, excited by linearly polarized beams. Anomalous positive and negative torques on particles (doped with judicious amount of dye molecules) are over 800 and 200 times larger than the ordinary lossy counterparts, respectively. Meanwhile, a rotational motor can be configured by switching the s- and p-polarized beams, exhibiting opposite optical torques. These giant and reversed optical torques are unveiled for the first time in the scattering spectrum, paving another avenue toward exploring unprecedented physics of hybrid and superhybrid multipoles in metaoptics and optical manipulations. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|