Hyper-spectral confocal nano-imaging with a 2D super-lens

Area of Science:

• Optics and Photonics
• Nanotechnology
• Biophysics

Background:

• Achieving sub-100 nm resolution in nano-imaging of cell-surface interfaces across visible wavelengths remains a significant challenge.
• Existing techniques like metamaterial super-lenses and near-field optics are limited to single wavelengths and lack access to cell-surface interfaces.

Purpose of the Study:

• To investigate a broadband 2D lens capable of sub-100 nm resolution for nano-imaging.
• To enable high-resolution, hyper-spectral imaging of cell-surface interfaces.

Main Methods:

• Investigated a broadband 2D lens composed of an oblate spheroidal dielectric cavity beneath a planar metal surface.
• The lens focuses asymmetric plasmon energies at sub-100 nm scale on a thin metal film.
• Proposed integration of the lens into a high-resolution far-field confocal microscopy setup.

Main Results:

• Demonstrated a broadband 2D lens operating at sub-100 nm scale.
• The lens focuses plasmon energies adiabatically, enabling sub-100 nm resolution.
• The system is suitable for surface-field imaging.

Conclusions:

• The developed broadband 2D lens offers a pathway to sub-100 nm resolution imaging.
• The proposed confocal microscopy setup with the lens is a promising tool for cell-surface interfacial studies.
• This technique facilitates hyper-spectral imaging analysis at the nanoscale for biological interfaces.