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An Optically Controlled Microscale Elevator Using Plasmonic Janus Particles.

Spas Nedev¹, Sol Carretero-Palacios², Paul Kühler¹

¹Photonics and Optoelectronics Group, Department of Physics and Center for Nanoscience (CeNS), Ludwig-Maximilians-Universität (LMU) , Amalienstaße 54, 80799 Munich, Germany ; Nanosystems Initiative Munich (NIM) , Schellingstraße 4, 80799 Munich, Germany.

|May 8, 2015

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This summary is machine-generated.

Janus particles are optically trapped and moved using light and heat. Laser power controls vertical motion, enabling precise micromanipulation and creating a photonic elevator for diverse applications.

Area of Science:

Physics, Optics
Materials Science
Nanotechnology

Background:

Optical tweezers are crucial for manipulating microparticles.
Janus particles offer unique optical and thermal properties due to their asymmetric composition.
Controlling particle motion via combined optical and thermal forces is an active research area.

Purpose of the Study:

To demonstrate stable trapping and controlled axial displacement of Janus particles using optical tweezers.
To investigate the interplay of optical scattering and laser-induced thermal gradients in particle motion.
To explore the potential of Janus particles as a tool for micromanipulation and sensing.

Main Methods:

Utilizing optical tweezers to trap Janus particles (silica sphere with a gold half-shell).

Keywords:

Janus particles microswimmer optical trapping thermophoresis

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Analyzing particle behavior under varying laser power to study axial displacement.

Investigating the influence of laser beam structure and absorption on particle dynamics.

Demonstrating simultaneous trapping and controlled spacing of a Janus particle and a gold nanoparticle.

Main Results:

Janus particles are stably trapped and exhibit controllable axial displacement along the laser beam axis.
Particle motion is governed by a combination of optical scattering forces and laser-induced thermal gradients.
Laser power directly influences upward (increase) or downward (decrease) particle motion.
Reversible axial displacement and a hysteretic jump in particle position were observed due to complex laser beam patterns.

Conclusions:

Janus particles can be precisely manipulated using a combination of optical and thermal effects.
The developed photonic micron-scale elevator system shows promise for advanced micromanipulation.
This technique has potential applications in thermal force studies, remote sensing, and optical/thermal experiments.