Emission spectroscopy of NaYF_(4):Eu nanorods optically trapped by Fresnel lens fibers  

作　　者：Aashutosh Kumar Asa Asadollahbaik Jeongmo Kim Khalid Lahlil Simon Thiele Alois M.Herkommer Síle Nic Chormaic Jongwook Kim Thierry Gacoin Harald Giessen Jochen Flck 

机构地区：[1]Universite Grenoble Alpes,CNRS,Institut Neel,38000 Grenoble,France [2]4th Physics Institute and Research Center SCoPE,University of Stuttgart,70569 Stuttgart,Germany [3]Universite Paris Saclay,CNRS,Laboratoire de Physique de la Matiere Condensee,Ecole Polytechnique,91128 Palaiseau,France [4]Institute of Applied Optics and Research Center SCoPE,University of Stuttgart,70569 Stuttgart,Germany [5]Okinawa Institute of Science and Technology Graduate University,Okinawa 904-0495,Japan

出　　处：《Photonics Research》2022年第2期332-339,共8页光子学研究（英文版）

基　　金：Agence Nationale de la Recherche (ANR-16-CE24-0014-01);Okinawa Institute of Science and Technology Graduate University;Baden-Württemberg Stiftung (Operial);Bundesministerium für Bildung und Forschung (Printoptics);European Research Council (POC3DPrinted Optics)。

摘　　要：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.

关 键 词：NANORODS FRESNEL TRAPPING 

分 类 号：TN253[电子电信—物理电子学]