Journal
NANO LETTERS
Volume 20, Issue 9, Pages 6494-6501Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c02240
Keywords
optical tweezers; optical rotation; nanorods; silicon; thermometry; Raman scattering
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Funding
- Knut and Alice Wallenberg Foundation
- Swedish Research Council
- Chalmers Excellence Initiative Nano
- National Science Centre, Poland from the European Union's Horizon 2020 research and innovation program under the Marie SklodowskaCurie Grant [2016/23/P/ST3/02156, 665778]
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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 similar to 220 x 120 nm(2) 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.
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