Nanoparticle orbital rotation, from a nanoscale plasmonic hotspot to the periphery of a laser beam
Nanoparticle orbital rotation, from a nanoscale plasmonic hotspot to the periphery of a laser beam
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DOI：
10.1117/12.2659394
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发表时间：
2022-12
期刊：
影响因子：
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通讯作者：
Christophe Pin;H. Fujiwara;Kota Sudo;Ryo Kakuta;Yuji Sunaba;S. Ishida;K. Sasaki
中科院分区：
文献类型：
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作者：
Christophe Pin;H. Fujiwara;Kota Sudo;Ryo Kakuta;Yuji Sunaba;S. Ishida;K. Sasaki
光的自旋角动量可以通过自旋-轨道角动量转换引起物质的轨道转动。在这项工作中，我们证明了使用两种不同的物理机制的纳米粒子的轨道旋转。首先，在圆偏振激光照射下，在等离子体三聚体纳米天线的纳米间隙上方产生纳米级坡印廷矢量涡旋。利用这些三聚体纳米镊子，单荧光纳米金刚石捕获和旋转实验实现。其次，VO 2纳米粒子的轨道旋转是使用聚焦的圆偏振高斯激光束实现的。我们证明了由VO 2的绝缘体到金属相变引起的非线性光学响应导致在激光束中心周围形成环形捕获势阱。
The spin angular momentum of light can induce the orbital rotation of matter via spin-orbit angular momentum conversion. In this work, we demonstrate the orbital rotation of nanoparticles using two different physical mechanisms. First, a nanoscale Poynting vector vortex is created above the nanogap of a plasmonic trimer nanoantenna upon circularly polarized laser irradiation. Using these trimer nanotweezers, single fluorescent nanodiamond trapping and rotation is experimentally achieved. Second, the orbital rotation of VO2 nanoparticles is achieved using a focused, circularly polarized Gaussian laser beam. We demonstrate that the non-linear optical response caused by the insulator-to-metal phase transition of VO2 leads to the formation of an annular trapping potential well around the center of the laser beam.