研究目的
Investigating the coherent control of two-photon photoluminescence in resonant gold nanoantennas through spectral phase manipulation.
研究成果
The study demonstrates that two-photon photoluminescence in resonant gold nanoantennas can exhibit coherent behavior when excited with pulses shorter than the plasmon dephasing time. This allows for pure spectral phase control of the nanoantenna response, with potential applications in nanoparticle labelled two-photon imaging.
研究不足
The study is limited by the intrinsic metal losses and the short dephasing times of plasmon oscillations in gold nanoantennas, which challenge the observation of coherent responses.
1：Experimental Design and Method Selection:
The study utilized a broadband titanium-sapphire laser for excitation, with a pulse shaper for spectral phase control. The two-photon response was detected using an avalanche photodiode or a spectrometer.
2：Sample Selection and Data Sources:
An array of Au nanoantennas with varying lengths was fabricated for resonance identification. BaTiO3 nanoparticles were used as a reference for SHG measurements.
3：List of Experimental Equipment and Materials:
A titanium-sapphire laser (Octavius 85M, Menlo Systems), high numerical aperture objective (Zeiss Axiovert 200, Zeiss Plan Apochromat 100x
4：46 Oil Objective), avalanche photodiode (APD), and electron multiplying CCD camera (Andor). Experimental Procedures and Operational Workflow:
The laser excited individual nanoparticles, with the TPPL/SHG signal collected in epi-fluorescence mode. A 4f pulse shaper exerted spectral phase control.
5：Data Analysis Methods:
The power dependence of TPPL was analyzed, and the phase response was investigated by adding a static π-phase step at the central frequency.
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