Volume 126, Number 2, April 2019
|Number of page(s)||7|
|Section||Interdisciplinary Physics and Related Areas of Science and Technology|
|Published online||30 May 2019|
Disappearance and reappearance of an optical trap for silver nanoparticles under femtosecond pulsed excitation: A theoretical investigation
1 Department of Physical Sciences, Indian Institute of Science Education and Research (IISER) Mohali Knowledge City, Sector 81, SAS Nagar, Punjab 140306, India
2 Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali Knowledge City, Sector 81, SAS Nagar, Punjab 140306, India
Received: 16 February 2019
Accepted: 20 April 2019
Recently, the role of ultrafast pulsed excitation in laser trapping of dielectric nanoparticles has been explored and it was observed that the optical Kerr effect (OKE) plays an important role in determining the stability of the trap. Here, we theoretically investigate the trapping behaviour of metallic (silver) nanoparticles and study the effect of OKE (up to sixth order) under high repetition rate femtosecond pulsed excitation. We observe that the trapping potential is first stabilized, then destabilized and again stabilized with an increase in laser power. This work shows how one can fine-tune the stability of an optical trap for metallic nanoparticles through OKE.
PACS: 87.80.Cc – Optical trapping / 42.50.Wk – Mechanical effects of light on material media, microstructures and particles / 42.65.An – Optical susceptibility, hyperpolarizability
© EPLA, 2019
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