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An optically controlled microscale elevator using plasmonic janus particles

AutorNedev, Spas; Carretero-Palacios, S.; Kühler, Paul; Lohmüller, Theobald; Urban, Alexander S.; Anderson, Lindsey J. E.; Feldmann, Jochen
Palabras claveJanus particles
Optical trapping
Fecha de publicación2015
EditorAmerican Chemical Society
CitaciónACS Photonics 2: 491- 496 (2015)
Resumen© 2015 American Chemical Society. In this article, we report how Janus particles, composed of a silica sphere with a gold half-shell, can be not only stably trapped by optical tweezers but also displaced controllably along the axis of the laser beam through a complex interplay between optical and thermal forces. Scattering forces orient the asymmetric particle, while strong absorption on the metal side induces a thermal gradient, resulting in particle motion. An increase in the laser power leads to an upward motion of the particle, while a decrease leads to a downward motion. We study this reversible axial displacement, including a hysteretic jump in the particle position that is a result of the complex pattern of a tightly focused laser beam structure above the focal plane. As a first application we simultaneously trap a spherical gold nanoparticle and show that we can control the distance between the two particles inside the trap. This photonic micron-scale >elevator> is a promising tool for thermal force studies, remote sensing, and optical and thermal micromanipulation experiments.
Identificadoresdoi: 10.1021/ph500371z
issn: 2330-4022
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