Nano-plasmonic dual-mode probe for near-vector field scanning optical microscopy

Area of Science:

• Nanophotonics
• Optical Microscopy

Background:

• Scanning near-field optical microscopy (SNOM) relies on probes to capture high-frequency sample information.
• Current SNOM probes are limited to detecting either transverse or longitudinal fields independently.
• This limitation increases costs and results in information loss, restricting SNOM's utility.

Purpose of the Study:

• To develop a novel nano-plasmonic probe for SNOM.
• To enable simultaneous characterization of both transverse and longitudinal near-fields with a single probe.
• To overcome the limitations of single-polarization probes in SNOM.

Main Methods:

• Design of a nano-plasmonic probe featuring a nanoparticle-on-aperture structure on a tapered fiber tip.
• Utilizing optical tweezers technology for probe fabrication analysis.
• Development of a single system capable of dual-mode transmission for near-field characterization.

Main Results:

• The proposed probe integrates a nanoparticle-on-aperture in a film structure on a fiber tip.
• The nano-plasmonic probe demonstrates two transmission modes for comprehensive near-field analysis.
• Feasibility of fabrication using optical tweezers technology is confirmed.

Conclusions:

• The developed nano-plasmonic probe effectively characterizes both transverse and longitudinal near-fields simultaneously.
• This dual-mode capability addresses key limitations of existing SNOM probes.
• The probe shows significant potential for advancing SNOM applications and imaging capabilities.