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Antenna-assisted picosecond control of nanoscale phase-transition in vanadium dioxide

Antenna-assisted picosecond control of nanoscale phase-transition in vanadium dioxide
Antenna-assisted picosecond control of nanoscale phase-transition in vanadium dioxide
Nanoscale devices in which the interaction with light can be configured using external control signals hold great interest for
next-generation optoelectronic circuits. Materials exhibiting a structural or electronic phase transition offer a large modulation
contrast with multi-level optical switching and memory functionalities. In addition, plasmonic nanoantennas can provide an
efficient enhancement mechanism for both the optically induced excitation and the readout of materials strategically positioned
in their local environment. Here, we demonstrate picosecond all-optical switching of the local phase transition in plasmonic
antenna-vanadium dioxide (VO2) hybrids, exploiting strong resonant field enhancement and selective optical pumping in plasmonic hotspots. Polarization- and wavelength-dependent pump–probe spectroscopy of multifrequency crossed antenna arrays
shows that nanoscale optical switching in plasmonic hotspots does not affect neighboring antennas placed within 100 nm of the
excited antennas. The antenna-assisted pumping mechanism is confirmed by numerical model calculations of the resonant,
antenna-mediated local heating on a picosecond time scale. The hybrid, nanoscale excitation mechanism results in 20 times
reduced switching energies and 5 times faster recovery times than a VO2 film without antennas, enabling fully reversible switching at over two million cycles per second and at local switching energies in the picojoule range. The hybrid solution of antennas
and VO2 provides a conceptual framework to merge the field localization and phase-transition response, enabling precise, nanoscale optical memory functionalities.
1-9
Muskens, Otto L.
2284101a-f9ef-4d79-8951-a6cda5bfc7f9
Bergamini, Luca
4e685bdd-cf29-4779-b98b-e8076260975b
Wang, Yudong
c48bcc7c-4cb4-468c-af4e-d1e601222009
Gaskell, Jeffrey M.
9ee4a136-dcdc-4325-a6fb-509d55af6f1d
Zabala, Nerea
b0cfba0a-9b8d-4282-b75c-7af2faea5c81
de Groot, C.H.
92cd2e02-fcc4-43da-8816-c86f966be90c
Sheel, David W.
e18a1ba6-034a-475a-bd05-c2f1c333d351
Aizpurua, Javier
17705349-38e3-4089-adba-547d02449095
Muskens, Otto L.
2284101a-f9ef-4d79-8951-a6cda5bfc7f9
Bergamini, Luca
4e685bdd-cf29-4779-b98b-e8076260975b
Wang, Yudong
c48bcc7c-4cb4-468c-af4e-d1e601222009
Gaskell, Jeffrey M.
9ee4a136-dcdc-4325-a6fb-509d55af6f1d
Zabala, Nerea
b0cfba0a-9b8d-4282-b75c-7af2faea5c81
de Groot, C.H.
92cd2e02-fcc4-43da-8816-c86f966be90c
Sheel, David W.
e18a1ba6-034a-475a-bd05-c2f1c333d351
Aizpurua, Javier
17705349-38e3-4089-adba-547d02449095

Muskens, Otto L., Bergamini, Luca, Wang, Yudong, Gaskell, Jeffrey M., Zabala, Nerea, de Groot, C.H., Sheel, David W. and Aizpurua, Javier (2016) Antenna-assisted picosecond control of nanoscale phase-transition in vanadium dioxide. Light: Science & Applications, 5 (10), 1-9, [e16173]. (doi:10.1038/lsa.2016.173).

Record type: Article

Abstract

Nanoscale devices in which the interaction with light can be configured using external control signals hold great interest for
next-generation optoelectronic circuits. Materials exhibiting a structural or electronic phase transition offer a large modulation
contrast with multi-level optical switching and memory functionalities. In addition, plasmonic nanoantennas can provide an
efficient enhancement mechanism for both the optically induced excitation and the readout of materials strategically positioned
in their local environment. Here, we demonstrate picosecond all-optical switching of the local phase transition in plasmonic
antenna-vanadium dioxide (VO2) hybrids, exploiting strong resonant field enhancement and selective optical pumping in plasmonic hotspots. Polarization- and wavelength-dependent pump–probe spectroscopy of multifrequency crossed antenna arrays
shows that nanoscale optical switching in plasmonic hotspots does not affect neighboring antennas placed within 100 nm of the
excited antennas. The antenna-assisted pumping mechanism is confirmed by numerical model calculations of the resonant,
antenna-mediated local heating on a picosecond time scale. The hybrid, nanoscale excitation mechanism results in 20 times
reduced switching energies and 5 times faster recovery times than a VO2 film without antennas, enabling fully reversible switching at over two million cycles per second and at local switching energies in the picojoule range. The hybrid solution of antennas
and VO2 provides a conceptual framework to merge the field localization and phase-transition response, enabling precise, nanoscale optical memory functionalities.

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Accepted/In Press date: 2 June 2016
e-pub ahead of print date: 3 June 2016
Organisations: Quantum, Light & Matter Group

Identifiers

Local EPrints ID: 398078
URI: http://eprints.soton.ac.uk/id/eprint/398078
PURE UUID: 46dcf54d-08b2-41d6-926b-f70b12505789
ORCID for Otto L. Muskens: ORCID iD orcid.org/0000-0003-0693-5504
ORCID for C.H. de Groot: ORCID iD orcid.org/0000-0002-3850-7101

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Date deposited: 18 Jul 2016 08:48
Last modified: 15 Sep 2021 01:55

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Contributors

Author: Otto L. Muskens ORCID iD
Author: Luca Bergamini
Author: Yudong Wang
Author: Jeffrey M. Gaskell
Author: Nerea Zabala
Author: C.H. de Groot ORCID iD
Author: David W. Sheel
Author: Javier Aizpurua

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