Optical manipulation and study of single gold nanoparticles in solution

Leiden Repository

Optical manipulation and study of single gold nanoparticles in solution

Title: Optical manipulation and study of single gold nanoparticles in solution
Author: Ruijgrok, Paul Victor
Publisher: Leiden Institute of Physics, Faculty of Science, Leiden University
Issue Date: 2012-05-10
Keywords: Acoustic vibration
Brownian motion
Gold nanoparticle
Gold nanorod
Nano-mechanics
Nano-optics
Optical torque
Optical trapping
Optical tweezer
Photothermal microscopy
Single-particle detection
Ultrafast spectroscopy
Abstract: We combine optical trapping and far-field optical detection techniques in a novel approach to study single metal nanoparticles in solution. We demonstrate the first measurements of the acoustic vibrations of single gold nanoparticles optically trapped in water, and find evidence for intrinsic damping mechanisms. Additionally, we explore the potential of single gold nanorods as ultra-small mechanical actuators: we quantify the optical forces and torques on a single trapped gold nanorod (25 nm diameter and 60 nm length) and show that the rod can simultaneously exert forces and torques that would be large enough to manipulate single (macro-) molecules. We developed techniques to measure the combined translational and rotational Brownian motion of a trapped nanorod. We determine the rod's heating by the trap beam and show that translational and rotational Brownian motion of a hot particle are described by different effective temperatures and viscosities.
Description: Promotor: M.A.G.J. Orrit. Co-promotor: P. Zijlstra
With summary in Dutch
Faculty: Faculteit der Wiskunde en Natuurwetenschappen
Citation: Ruijgrok, P.V., 2012, Doctoral thesis, Leiden University
Series/Report no.: Casimir PhD series;2012-10
ISBN: 9789085931225
Handle: http://hdl.handle.net/1887/18933
 

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application/pdf Chapter 1 Introduction 147.2Kb View/Open
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