研究目的
To control forced nanostructures by engineering a discrete set of nonmodal degrees of freedom, originating from joint nanostructure-source antiresonances, and to demonstrate the forced response of ultrathin gold films shaped by pairs of resonant-antiresonant plasmons.
研究成果
The study demonstrates that the forced response of nanostructures can be controlled by engineering a discrete set of nonmodal degrees of freedom, originating from joint nanostructure-source antiresonances. It shows that ultrathin gold films can exhibit strong spectroangular wideband absorption by tuning the excitation of resonant-antiresonant plasmon pairs.
研究不足
The spectral range of measurement is limited by the transmission band of the optical fiber, and the angular range is limited by a systemic offset error caused by refraction inside the coupling prism.
1：Experimental Design and Method Selection:
The experiment involves measuring the reflectance of ultrathin gold films of different thicknesses (44, 21, and 11 nm) atop fused silica right-angle prisms using a spectroscopic ellipsometer. The measurements are taken at high angular resolution over a wide range of illumination wavelengths.
2：Sample Selection and Data Sources:
Three gold films of different thicknesses are fabricated atop fused silica right-angle prisms. The reflectance measurements are taken as a function of incidence angle and illumination wavelength.
3：List of Experimental Equipment and Materials:
A J.A. Woollam variable angle spectroscopic ellipsometer (VASE) operated in RT data acquisition mode using focusing lenses, a wideband xenon lamp, and a monochromator.
4：Experimental Procedures and Operational Workflow:
The light source is filtered by a monochromator, TM polarized, and focused onto the coupling prism. The sample is mounted on a rotation stage, and the specular reflection is collected by a rotating detection arm.
5：Data Analysis Methods:
The reflectance data is analyzed to identify the contributions of resonant (SPPs) and antiresonant (APPs) plasmonic degrees of freedom to the forced response of the nanostructures.
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