| 5 | Emission spectroscopy of NaYF_(4):Eu nanorods optically trapped by Fresnel lens fibers显示文摘NaYF_(4):Eu nanorods with high aspect ratios are elaborated and optically trapped using dual fiber optical tweezers in a counterpropagating geometry. High trapping efficiency is observed using converging beams, emitted from diffractive Fresnel lenses directly 3D printed onto cleaved fiber facets. Stable nanorod trapping and alignment are reported for a fiber-to-fiber distance of 200 μm and light powers down to 10 m W. Trapping of nanorod clusters containing one to three nanorods and the coupling of nanorod motion in both axial and transverse directions are considered and discussed. The europium emission is studied by polarization-resolved spectroscopy with particular emphasis on the magnetic and electric dipole transitions. The respective σ and π orientations of the different emission lines are determined. The angles with respect to the nanorod axes of the corresponding magnetic and electric dipoles are calculated. Mono-exponential emission decay with decay time of 4–5 ms is reported. It is shown that the nanorod orientation can be determined by purely spectroscopic means. | Aashutosh Kumar Asa Asadollahbaik Jeongmo Kim Khalid Lahlil Simon Thiele Alois M.Herkommer Síle Nic Chormaic Jongwook Kim Thierry Gacoin Harald Giessen Jochen Flck | 2022 | Photonics Research2022，10，2： | 1 |
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