Extended depth of field of diffraction limited imaging system using spatial light modulator based intensity compensated polarization coded aperture

TL;DR

This paper demonstrates an innovative method using polarization coded apertures with spatial light modulators to extend the depth of field in diffraction-limited imaging systems, overcoming aperture size limitations and enhancing axial intensity.

Contribution

It introduces intensity compensated polarization encrypted apertures designed with LC-SLM for improved depth of field and axial intensity in optical imaging.

Findings

Enhanced depth of field in diffraction-limited systems.

Validated axial intensity improvement with polarization coded apertures.

Achieved these results despite nominal intensity loss.

Abstract

Reducing the aperture size is a conventional technique to obtain enhanced image resolution in optics but it is obscured by depleting illumination. Polarization coded apertures (PCAs) can be employed to circumvent this critical artifact. We experimentally demonstrate intensity compensated polarization encrypted apertures, which are designed using the polarization modulation characteristics of LC-SLM. PCAs are not limited by the aperture size and hence far-field point spread function (PSF) can be more conveniently recorded using these PCAs. We experimentally validate that Depth of field (DOF) of a diffraction-limited lens and axial intensity of binary Fresnel zone plate (BFZP) is enhanced using PCAs with nominal intensity loss.