研究目的
Investigating the nonlinear properties of plasmonic structures, specifically the plasmonic analog of electromagnetically induced absorption, to reveal minute structural asymmetries and their impact on nonlinear optical responses.
研究成果
The nonlinear response of plasmonic structures can reveal minute structural asymmetries not detectable in the linear regime. This sensitivity to asymmetries and the detailed understanding of nonlinear contributions can guide future research in tailoring the nonlinear optical properties of nanostructured matter.
研究不足
The study is limited by the fabrication imperfections of the plasmonic structures, which introduce minute asymmetries affecting the nonlinear response. Additionally, the experimental setup's sensitivity to structural asymmetries may not capture all possible nonlinear contributions.
1：Experimental Design and Method Selection:
The study involves nonlinear spectroscopy on plasmonic structures designed to mimic electromagnetically induced absorption. The methodology includes wavelength and polarization resolved studies to investigate nonlinear contributions.
2：Sample Selection and Data Sources:
Plasmonic dolmen structures fabricated using standard electron beam lithography on an ultraviolet transparent glass substrate.
3：List of Experimental Equipment and Materials:
Femtosecond Yb:KGW oscillator, fiber-feedback optical parametric oscillator (OPO), spectrometer (Acton 2500), Peltier-cooled charge coupled device (CCD) camera (Pixis 256E), and Fourier-transform infrared (FTIR) spectrometer (Bruker Vertex 80).
4：0). Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The OPO signal output is used as the exciting fundamental wave, focused onto the sample with polarization set along the dipole long axis. The generated TH signal is collected in transmission and analyzed.
5：Data Analysis Methods:
The TH signal is analyzed using a spectrometer and CCD camera, with data normalized to the TH emitted from a bare substrate to account for variations in pulse parameters and experimental setup.
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