Optical Rotation and Thermometry of Laser Tweezed Silicon Nanorods
Artikel i vetenskaplig tidskrift, 2020

Optical rotation of laser tweezed nanoparticles offers a convenient means for optical to mechanical force transduction and sensing at the nanoscale. Plasmonic nanoparticles are the benchmark system for such studies, but their rapid rotation comes at the price of high photoinduced heating due to Ohmic losses. We show that Mie resonant silicon nanorods with characteristic dimensions of ∼220 × 120 nm2 can be optically trapped and rotated at frequencies up to 2 kHz in water using circularly polarized laser light. The temperature excess due to heating from the trapping laser was estimated by phonon Raman scattering and particle rotation analysis. We find that the silicon nanorods exhibit slightly improved thermal characteristics compared to Au nanorods with similar rotation performance and optical resonance anisotropy. Altogether, the results indicate that silicon nanoparticles have the potential to become the system of choice for a wide range of optomechanical applications at the nanoscale.



optical tweezers


Raman scattering

optical rotation


Pawel Karpinski

Chalmers, Fysik, Bionanofotonik

Politechnika Wrocławska

Steven Jones

Chalmers, Fysik, Nano- och biofysik

Hana Jungová

Chalmers, Fysik, Nano- och biofysik

Ruggero Verre

Chalmers, Fysik, Nano- och biofysik

Mikael Käll

Chalmers, Fysik, Nano- och biofysik

Nano Letters

1530-6984 (ISSN) 1530-6992 (eISSN)

Vol. 20 9 6494-6501



Atom- och molekylfysik och optik

Annan fysik





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