Fibonacci terahertz imaging by silicon diffractive optics

TL;DR

This paper demonstrates Fibonacci bifocal terahertz imaging using silicon diffractive zone plates, achieving simultaneous multi-plane imaging with high spatial resolution at 0.6 THz, and compares it with conventional methods.

Contribution

It introduces a novel Fibonacci silicon diffractive zone plate for terahertz imaging, enabling multi-focus imaging and analyzing its performance across frequencies.

Findings

Successful experimental demonstration at 0.6 THz

Achieved spatial resolution of wavelength scale

Good agreement between experiments and simulations

Abstract

Fibonacci or bifocal terahertz (THz) imaging is demonstrated experimentally employing silicon diffractive zone plate (SDZP) in a continuous wave mode. Images simultaneously recorded in two different planes are exhibited at 0.6 THz frequency with the spatial resolution of wavelength. Multi-focus imaging operation of the Fibonacci lens is compared with a performance of the conventional silicon phase zone plate. Spatial profiles and focal depth features are discussed varying the frequency from 0.3 THz to 0.6 THz. Good agreement between experimental results and simulation data is revealed.