1.Physics and Astronomy, Faculty of Physical Sciences and Engineering, University of Southampton, Southampton SO17 1BJ, UK
2.Department of Electricity and Electronics, FCT-ZTF, UPV-EHU, Bilbao 48080, Spain
3.Materials Physics Center, CSIC-UPV/EHU and DIPC, San Sebastian 20018, Spain
4.Nano Group, Faculty of Physical Sciences and Engineering, University of Southampton, Southampton SO17 1BJ, UK
5.Materials and Physics Research Centre, University of Salford, Manchester M5 4WT, UK
OL Muskens, Email: O.Muskens@soton.ac.uk
纸质出版日期:2016-12,
网络出版日期:2016-06-03,
收稿日期:2016-02-27,
修回日期:2016-05-31,
录用日期:2016-06-02
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Antenna-assisted picosecond control of nanoscale phase transition in vanadium dioxide[J]. LSA, 2016,5(4).
Muskens, O. L. et al. Antenna-assisted picosecond control of nanoscale phase transition in vanadium dioxide. Light: Science & Applications, 5, e16173 (2016).
Antenna-assisted picosecond control of nanoscale phase transition in vanadium dioxide[J]. LSA, 2016,5(4). DOI: 10.1038/lsa.2016.173.
Muskens, O. L. et al. Antenna-assisted picosecond control of nanoscale phase transition in vanadium dioxide. Light: Science & Applications, 5, e16173 (2016). DOI: 10.1038/lsa.2016.173.
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 (VO
2
) 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 VO
2
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 VO
2
provides a conceptual framework to merge the field localization and phase-transition response
enabling precise
nanoscale optical memory functionalities.
insulator-metal phase transitionnanoantennaplasmonicsVO2
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