研究目的
Investigating the nonlinear light emission from spatially confined resonant gap-mode plasmons in a metal-dielectric-metal geometry and its deviation from spatially random systems.
研究成果
The study reveals that decreasing the spacer thickness in the MDM geometry reduces the values for p(ω) and leads to the appearance of two distinct linear regimes in the scaling exponent slope. These findings indicate that the physical mechanism of the nonlinear PL signal from thermalized hot electron relaxation requires further investigation.
研究不足
The physical mechanism of the nonlinear PL signal originating from thermalized hot electron relaxation needs to be revisited as proposed theories in previous works do not fully capture the observed effects.
1：Experimental Design and Method Selection:
The study uses a metal-dielectric-metal (MDM) geometry to control the degree of spatial confinement of the resonant gap-mode plasmons.
2：Sample Selection and Data Sources:
The samples consist of 30 nm thick Au nanowires with varying strip width separated from a 30 nm thick Au film by nanometric SiO2 layers of varying thickness.
3：List of Experimental Equipment and Materials:
Au layer and Au grating made using thermal evaporation and standard electron beam lithography, SiO2 layer made using atomic layer deposition (ALD).
4：Experimental Procedures and Operational Workflow:
The MDM nanostructures are excited on resonance with a 785 nm Ti:Saph pulsed laser, and the PL is collected through a polarizer aligned in the same way as the excitation light.
5：Data Analysis Methods:
The power exponent, p(ω), is calculated by fitting the spectral signals, SP (ω), to the corresponding laser powers, P.
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