# Nano-jet Related to Bessel Beams and to Super-Resolutions in Micro-sphere Optical Experiments

## TL;DR

This paper analyzes the nano-jet phenomenon in micro-sphere optics, relating it to Bessel beams and super-resolution imaging, by using subwavelength apertures and evanescent wave superposition to enhance imaging detail.

## Contribution

It introduces a novel approach linking nano-jet formation to Bessel beams and demonstrates super-resolution imaging through evanescent wave superposition in micro-sphere systems.

## Key findings

- Enhanced optical depth in imaging process.
- Resolution of fine object structures via evanescent wave modulation.
- Improved phase contrast measurements with interferometry.

## Abstract

The appearance of a Nano-jet in the micro-sphere optical experiments is analyzed by relating this effect to non-diffracting Bessel beams. By inserting a circular aperture with a radius which is in the order of subwavelength in the EM waist, and sending the transmitted light into a confocal microscope, EM fluctuations by the different Bessel beams are avoided. On this constant EM field evanescent waves are superposed. While this effect improves the optical-depth of the imaging process, the object fine-structures are obtained, from the modulation of the EM fields by the evanescent waves. The use of a combination of the micro-sphere optical system with an interferometer for phase contrast measurements is described.

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Source: https://tomesphere.com/paper/1703.00553