研究目的
Investigating the use of metallic single walled carbon nanotubes (SWNTs) as ultra-compact and low-loss Fabry-Perot plasmonic resonators for deep subwavelength manipulation of light matter interactions.
研究成果
Metallic SWNT nanocavities serve as one of the most compact nano-plasmonic elements with exceptional tunability and low loss, offering a viable route towards exceedingly strong and efficient light-matter interaction regime and showing great promises in various appealing applications such as nanoscale lasers and amplifiers, quantum nano-optics, nonlinear nano-optics and ultra-sensitive plasmonic nanosensors potentially down to single molecules.
研究不足
The accuracy of the cavity length achievable by the top-down nanolithography method is limited by the radius of the tip apex, which is ~ 20 nm in the experiment.
1：Experimental Design and Method Selection:
Advanced scanning probe lithography (SPL) is used to tailor SWNTs into ultraclean nanocavities of controllable sizes. Infrared nano-imaging is employed to investigate plasmon modes in these nanocavities.
2：Sample Selection and Data Sources:
High-quality SWNTs are directly grown by chemical vapor deposition (CVD) onto hexagonal boron nitride (h-BN) flakes exfoliated on SiO2/Si substrate.
3：List of Experimental Equipment and Materials:
Infrared scanning near-field optical microscope (IR-SNOM), quantum cascade laser (QCL), gold-coated AFM tip, mercury cadmium telluride (MCT) detector.
4：Experimental Procedures and Operational Workflow:
The scattering-type IR-SNOM is based on a tapping mode AFM. A QCL laser with tunable wavelength is focused onto the apex of a gold-coated AFM tip. The backscattered signal from the tip-sample system is captured by an MCT detector.
5：Data Analysis Methods:
The near-field responses are analyzed to extract plasmon wavelength and quality factor, and the results are compared with a Fabry-Perot resonator model.
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