研究目的
To investigate the nonlinear optical response of both individual and closely-packed assemblies of vertical hollow Ag nanopillars upon excitation with ultrafast laser pulses and to explore their potential applications in nonlinear photonics and sensing.
研究成果
The study demonstrates efficient TPPL emission accompanied by a clear SHG peak from both individual and closely-packed assemblies of vertical hollow Ag nanopillars. The intense nonlinear emission photon rate and the relatively low background allow envisioning the employment of these structures as nonlinear probes for analytes trapped between collapsed assemblies of nanopillars or flowing through the hollow channel of the single structures, making them appealing building blocks in multi-purpose devices for applications in nonlinear photonics and in broad-band biochemosensors.
研究不足
The study is conducted under ambient conditions where the oxidation of the Ag surface is known to take place more likely at local defects, leading to an inhomogeneous oxide coverage of the structure and favoring corrosion in the long term. This could hinder the performance of Ag-based plasmonic platforms due to the increasing losses of the material.
1：Experimental Design and Method Selection:
The study involves the fabrication of Ag-coated polymeric hollow nanopillars using Focused Ion Beam (FIB) lithography technique and their nonlinear optical characterization upon excitation with ultrafast laser pulses.
2：Sample Selection and Data Sources:
Samples consist of arrays of Ag-coated polymeric hollow nanopillars with an overall diameter of about 170 nm and a height of about 3 μm.
3：List of Experimental Equipment and Materials:
A home-made confocal setup, a Ti:Sapphire femtosecond laser, a beam splitter cube, an air objective with
4：9 numerical aperture, a piezo scanning stage, a silicon Single Photon Avalanche Detector (SPAD), and a commercial spectrometer coupled with a Peltier-cooled CCD camera. Experimental Procedures and Operational Workflow:
The nonlinear response of the nanopillars was investigated by exciting them with a Ti:Sapphire femtosecond laser, and the emitted radiation was collected in reflection geometry.
5：Data Analysis Methods:
The nonlinear emission spectra were analyzed to identify TPPL and SHG contributions, and power-dependent emission analysis was performed to confirm the nonlinear character of the emission.
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