Optical trapping and orientation-resolved spectroscopy of europium-doped nanorods

Aashutosh Kumar (1) , Jeongmo Kim (2) , Khalid Lahlil (3) , Gwénäelle Julié (4) , Síle Nic Chormaic (5) , Jongwook Kim (3) , Thierry Gacoin (3) , Jochen Fick (1)

1 NEEL - NOF - Nano-Optique et Forces
2 LPMC - Laboratoire de Physique de la Matière Condensée
3 LPMC - Laboratoire de physique de la matière condensée
4 NEEL - Nanofab - Nanofabrication
5 Quantum Optics Group

Europium-doped NaYF 4 nanorods with a high aspect ratio are optically trapped using a single fibre tip optical tweezers. Three distinct trapping positions of the nanorods are observed: in contact with the fibre tip, close to the tip and 5 µm from the tip end. The direction and polarisation-dependent Eu 3+ photoluminescence is investigated by recording the emission parallel and perpendicular to the nanorod long axis through the trapping fibre and the microscope objective, respectively. These spectroscopic measurements permit an unambiguous determination of the nanorod orientation.

Mots clés: optical tweezers; optical fibre; nanorods; europium; photoluminescence

Domaines: Optique [physics.optics]

Aashutosh Kumar, Jeongmo Kim, Khalid Lahlil, Gwénäelle Julié, Síle Nic Chormaic, et al.. Optical trapping and orientation-resolved spectroscopy of europium-doped nanorods. Journal of Physics: Photonics, 2020, 2 (2), pp.025007. ⟨10.1088/2515-7647/ab83e3⟩. ⟨hal-02569492⟩