期刊
NANOPHOTONICS
卷 10, 期 1, 页码 597-606出版社
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2020-0406
关键词
closed-loop control; coherent control; hot spot; nanoantenna; spectral phase control; ultrafast
资金
- European Commission (ERC Adv. Grant) [670949-LightNet]
- Spanish Severo Ochoa Programme for Centres of Excellence in RD [SEV-2015-0522]
- Plan National Project MICINN [FIS2012-35527]
- Fondo Europeo de Desarrollo Regional (FEDER)
- Catalan AGAUR [2014 SGR01540, 2017 SGR1369]
- Fundacio Privada Cellex
- Fundacio Privada Mir-Puig
- Generalitat de Catalunya through the Centres de Recerca de Catalunya (CERCA) program
- Spanish Government MINECO-FPI grant
- European Science Foundation under the PLASMON-BIONANOSENSE Exchange Grant program
- MICINN [TEC2011-22422]
- MINECO [TEC2014-52642-C2-1-R]
- Plan National Project MINECO [FIS2015-69258-P]
- Plan National Project MCIU [PGC2018-096875-B-I00]
Coherent control involves steering a system to an optimal state by adjusting the phase of an incident laser pulse, and in the case of gold nanoantennas, phase control of two-photon-induced photoluminescence (TPPL) has been shown to be possible, offering potential for nanoscale nonlinear coherent control.
Coherent control is an ingenious tactic to steer a system to a desired optimal state by tailoring the phase of an incident ultrashort laser pulse. A relevant process is the two-photon-induced photoluminescence (TPPL) of nanoantennas, as it constitutes a convenient route to map plasmonic fields, and has important applications in biological imaging and sensing. Unfortunately, coherent control of metallic nanoantennas is impeded by their ultrafast femtosecond dephasing times so far limiting control to polarization and spectral optimization. Here, we report that phase control of the TPPL in resonant gold nanoantennas is possible. We show that, by compressing pulses shorter than the localized surface plasmon dephasing time (<20 fs), a very fast coherent regime develops, in which the two-photon excitation is sensitive to the phase of the electric field and can therefore be controlled. Instead, any phase control is gone when using longer pulses. Finally, we demonstrate pure phase control by resorting to a highly sensitive closedloop strategy, which exploits the phase differences in the ultrafast coherent response of different nanoantennas, to selectively excite a chosen antenna. These results underline the direct and intimate relation between TPPL and coherence in gold nanoantennas, which makes them interesting systems for nanoscale nonlinear coherent control.
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