Date of Award

5-2024

Document Type

Thesis

Department

Department of Physics and Optical Engineering

First Advisor

Hossein Alisafaee

Second Advisor

Syed Reza

Third Advisor

Edward Wheeler

Abstract

A novel optical system designed to image light emitted from a CO 2 laser (10.6 μm) is presented here. This system utilizes a positive conventional lens and a negative all silicon metalens. Demonstrated here is the ability of metalenses to replace a combination of optical elements to produce more compact and light-weight optical systems. It also shows how metalenses can replace comparatively expensive custom-manufactured lenses. Several systems that utilize meta-surfaces are explored, including positive and negative metalenses, a meta-corrector, a metalens doublet imaging system that corrects for 0 th -order images overlapping 1 st -order images, and several telephoto optical systems. To further this, several meta-atom geometries, heights, and unit cell sizes are explored and compared to determine which design fulfills the requirements of this system best. The optical system, as designed, is based on the telephoto system but the negative metalens placed in front of a positive lens which is integral to the system creating a reverse-telephoto lens system. The final design uses a –20mm focal metalens with a diameter of 6.4 mm in the reverse telephoto. Electron lithography has been used to fabricate the metalens.

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