Subwavelength field localization based on dielectric mesoscale particle with single and blind nanohole array

TL;DR

This paper introduces a novel dielectric mesoscale particle with nanoholes that can localize electromagnetic fields at subwavelength scales, surpassing traditional diffraction limits for near-field imaging.

Contribution

It proposes a new nanohole-structured dielectric particle design that acts as a near-field probe with enhanced localization capabilities, enabling sub-diffraction focusing.

Findings

Nanohole array acts as near-field probes for surface illumination

Resonance mode determined by nanohole size, not wavelength

Achieves sub-diffraction-limited focusing at the particle exit

Abstract

Some new unusual physical phenomena and effects associated with dielectric mesoscale particles with Mie size parameter near 10 were studied and have been discovered during the last decade. In this paper, we propose nanoholes structured wavelength-scaled dielectric cubic particle with refractive index near two, where the array of nanoholes can act as a plurality of near-field probes to simultaneously illuminate the sample surface and it has the potential of surpassing the performance of most existing nearfield imaging approaches. We also offer the concept of the single nano-structuring of a dielectric cylinder or sphere made from conventional optical materials. The choice of the diameter of the nanohole in the particle "transfers" it into the resonance mode, when the characteristics of the field localized in the shadow part of the particle are determined not by the wavelength, but by the size of the nanohole. Thus, the diameter of the focused spot at the exit from the particle can be much smaller than the solid immersion diffraction limit.