研究目的
Investigating the far-field spectral and near-field spatial responses of an individual metal-insulator-metal nanoantenna using thermal fluctuations as an internal source of the electromagnetic field.
研究成果
The study demonstrates the ability to measure the far-field thermal emission spectrum and map the near-field thermal radiation of individual nanoantennas. It shows that the fundamental mode of a nanoantenna can be excited at distinct wavelengths around a resonance of the effective index of the plasmonic cavity. The methods developed can be applied to other nanostructures in the mid-IR range.
研究不足
The technique is sensitive enough to extract the radiation of a nanoantenna that is both isolated and sub-λ in all directions, but the background thermal radiation poses a challenge. The MIM antenna geometry is unfavorable for near-field measurements with a TRSTM due to the confinement of electromagnetic energy under the gold patch.
1：Experimental Design and Method Selection:
The study combines Fourier transform infrared spectroscopy with spatial modulation based on a light falloff effect in a confocal geometry for far-field measurements and uses thermal radiation scanning tunneling microscopy for near-field imaging.
2：Sample Selection and Data Sources:
Individual metal-insulator-metal nanoantennas are used as samples.
3：List of Experimental Equipment and Materials:
A FTIR spectrometer, IR microscope, Cassegrain objective, ZnSe lens, nitrogen-cooled mercury cadmium telluride IR detector, piezoelectric translation stage, and thermal radiation scanning tunneling microscope are used.
4：Experimental Procedures and Operational Workflow:
The sample is heated, and its position is controlled with a piezoelectric stage. The thermal radiation signal is modulated spatially to extract the nanoantenna's contribution.
5：Data Analysis Methods:
The signal is analyzed using lock-in demodulation at modulation frequencies, and numerical simulations support the experimental findings.
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