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All-optical phase-change memory in a single nanoparticle

All-optical phase-change memory in a single nanoparticle
All-optical phase-change memory in a single nanoparticle
Conventional electronic memories face a challenge in the reduction of size and power consumption as required for meeting the future demand on data storage and access. Phase-change memories have been suggested as candidates for solving this issue, with data recording done by switching the material between an amorphous and a crystalline phase, much in line with today's DVD/DVR technology for optical recording, and even the writing of individual dislocations has been reported. However, polymorphic systems exist in which other crystalline-to-crystalline transitions can provide for higher base logics. Here we demonstrate the principle of a four-level optical memory element obtained by using the phase of a single gallium nanoparticle of 80 nm size, with the four logical states of the memory written by optical pulses of a few pJ energy. The quaternary-logical memory element we demonstrate is comparable in size with the next-generation data storage elements and radically smaller than previously employed diffraction-limited optical memory elements. In addition, the energy required for switching the logical state of the nanoparticle is found to be one order of magnitude less than that of writing a bit in today's DVD/DVR or hard disk technology. This novel principle of operation has implications not only to optical memories and switching, but equally well applies as a key element for achieving plasmonic switching.
Soares, B.F.
89983b1e-0762-4343-b3f7-83e53ced4f36
Jonsson, F.
7c3532cd-4995-47d6-bae9-137d829afeb1
MacDonald, K.F.
76c84116-aad1-4973-b917-7ca63935dba5
Zheludev, N.I.
32fb6af7-97e4-4d11-bca6-805745e40cc6
Soares, B.F.
89983b1e-0762-4343-b3f7-83e53ced4f36
Jonsson, F.
7c3532cd-4995-47d6-bae9-137d829afeb1
MacDonald, K.F.
76c84116-aad1-4973-b917-7ca63935dba5
Zheludev, N.I.
32fb6af7-97e4-4d11-bca6-805745e40cc6

Soares, B.F., Jonsson, F., MacDonald, K.F. and Zheludev, N.I. (2006) All-optical phase-change memory in a single nanoparticle. 2nd Annual Workshop - Advances in Nanophotonics -PhOREMOST, Lithuania. 26 - 28 Sep 2006.

Record type: Conference or Workshop Item (Paper)

Abstract

Conventional electronic memories face a challenge in the reduction of size and power consumption as required for meeting the future demand on data storage and access. Phase-change memories have been suggested as candidates for solving this issue, with data recording done by switching the material between an amorphous and a crystalline phase, much in line with today's DVD/DVR technology for optical recording, and even the writing of individual dislocations has been reported. However, polymorphic systems exist in which other crystalline-to-crystalline transitions can provide for higher base logics. Here we demonstrate the principle of a four-level optical memory element obtained by using the phase of a single gallium nanoparticle of 80 nm size, with the four logical states of the memory written by optical pulses of a few pJ energy. The quaternary-logical memory element we demonstrate is comparable in size with the next-generation data storage elements and radically smaller than previously employed diffraction-limited optical memory elements. In addition, the energy required for switching the logical state of the nanoparticle is found to be one order of magnitude less than that of writing a bit in today's DVD/DVR or hard disk technology. This novel principle of operation has implications not only to optical memories and switching, but equally well applies as a key element for achieving plasmonic switching.

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More information

Published date: September 2006
Venue - Dates: 2nd Annual Workshop - Advances in Nanophotonics -PhOREMOST, Lithuania, 2006-09-26 - 2006-09-28
Organisations: Optoelectronics Research Centre, Physics & Astronomy

Identifiers

Local EPrints ID: 70961
URI: https://eprints.soton.ac.uk/id/eprint/70961
PURE UUID: 23dbff25-78d2-42d7-bb78-99edf6c879a9
ORCID for K.F. MacDonald: ORCID iD orcid.org/0000-0002-3877-2976
ORCID for N.I. Zheludev: ORCID iD orcid.org/0000-0002-1013-6636

Catalogue record

Date deposited: 11 Dec 2009
Last modified: 06 Jun 2018 13:09

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Contributors

Author: B.F. Soares
Author: F. Jonsson
Author: K.F. MacDonald ORCID iD
Author: N.I. Zheludev ORCID iD

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