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Title

Low energy-density recording with a highrepetitionrate laser beam in gold-nanorodembedded discs

Author(s)

Ullah, Md Azim;  Li, Xiangping;  Cheng, Xueming;  Hao, Xiaojian;  Su, Yahui;  Ma, Jianshe;  Gu, Min

Abstract

In this paper, we report on the low energy-density recording with a high-repetition-rate femtosecond pulsed beam in homogenous goldnanoroddispersed discs by using low numerical aperture (NA) microoptics. By focusing a femtosecond pulsed beam at a repetition rate of 82 MHz using a low NA DVD optical head, the spatially-stretched energy density introduces a temperature rising of the polymer matrix. This temperature rising facilitates the surface melting of gold nanorods, which leads to over one-order-of-magnitude reduction in the energy-density threshold for recording, compared with that by focusing single pulses through a high NA objective. Applying this finding, we demonstrate the dual-layer recording in gold-nanorod-dispersed discs with an equivalent capacity of 69 GB. Our results demonstrate the potential of ultra-high density three-dimensional optical memory with a low-cost and DVDcompatible apparatus.

Publication type

Journal article

Research centre

Swinburne University of Technology. Faculty of Engineering and Industrial Sciences. Centre for Micro-Photonics

Source

Optics Express, Vol. 20, no. 22 (Oct 2012), pp. 24516-24523

Publication year

2012

FOR Code(s)

0205 Optical Physics;  0906 Electrical and Electronic Engineering;  1005 Communications Technologies

Keyword(s)

Energy density;  Femtosecond pulses;  Gold nanorods;  High repetition rate;  Laser beams;  Optical discs;  Optical recording

Publisher

Optical Society of America

ISSN

1094-4087

Publisher URL

http://dx.doi.org/10.1364/oe.20.024516

Copyright

Copyright © 2012 Optical Society of America. This paper was published in Optics Express and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://dx.doi.org/10.1364/oe.20.024516. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.

Research Projects

An accelerating journey to the new era of Petabyte optical memory systems, Australian Research Council grant number FL100100099

Full text

Peer reviewed