Abstract:
:The photons in circularly polarized light can transfer their quantized spin angular momentum to micro- and nanostructures via absorption and scattering. This normally exerts positive torque on the objects wher the sign (i.e., handedness or angular direction) follows that of the spin angular momentum. Here we show that the sign of the optical torque can be negative in mesoscopic optical matter arrays of metal nanoparticles (NPs) assembled in circularly polarized optical traps. Crossover from positive to negative optical torque, which occurs for arrays with different number, separation and configuration of the constituent particles, is shown to result from many-body interactions as clarified by electrodynamics simulations. Our results establish that both positive and negative optical torque can be readily realized and controlled in optical matter arrays. This property and reconfigurability of the arrays makes possible programmable materials for optomechanical, microrheological and biological applications.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Han F,Parker JA,Yifat Y,Peterson C,Gray SK,Scherer NF,Yan Zdoi
10.1038/s41467-018-07376-7subject
Has Abstractpub_date
2018-11-20 00:00:00pages
4897issue
1issn
2041-1723pii
10.1038/s41467-018-07376-7journal_volume
9pub_type
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