Low energy-density recording with a high-repetition-rate laser beam in gold-nanorod-embedded discs

Low energy-density recording with a high-repetition-rate laser beam in gold-nanorod-embedded discs

In this paper, we report on the low energy-density recording with a high-repetition-rate femtosecond pulsed beam in homogenous gold-nanorod-dispersed discs by using low numerical aperture (NA) micro-optics. By focusing a femtosecond pulsed beam at a repetition rate of 82 MHz using a low NA DVD optic...

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Veröffentlicht in:Optics express 2012-10, Vol.20 (22), p.24516-24523
Hauptverfasser: Ullah, Md Azim, Li, Xiangping, Cheng, Xueming, Hao, Xiaojian, Su, Yahui, Ma, Jianshe, Gu, Min
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container_issue 22
container_start_page 24516
container_title Optics express
container_volume 20
creator Ullah, Md Azim
Li, Xiangping
Cheng, Xueming
Hao, Xiaojian
Su, Yahui
Ma, Jianshe
Gu, Min
description In this paper, we report on the low energy-density recording with a high-repetition-rate femtosecond pulsed beam in homogenous gold-nanorod-dispersed discs by using low numerical aperture (NA) micro-optics. 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 DVD-compatible apparatus.
doi_str_mv 10.1364/OE.20.024516
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title Low energy-density recording with a high-repetition-rate laser beam in gold-nanorod-embedded discs
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