3D-printed diffractive terahertz optical elements through computational design

Sourangsu Banerji; Berardi Sensale-Rodriguez

doi:10.1117/12.2518805

13 May 2019 3D-printed diffractive terahertz optical elements through computational design

Sourangsu Banerji, Berardi Sensale-Rodriguez

Proceedings Volume 10982, Micro- and Nanotechnology Sensors, Systems, and Applications XI; 109822X (2019) https://doi.org/10.1117/12.2518805
Event: SPIE Defense + Commercial Sensing, 2019, Baltimore, MD, United States

Abstract

This manuscript reviews our previously reported progress on the computational design of terahertz diffractive optical elements (DOEs). A scalar diffraction approach is advantageous due to its ease of modeling and fabrication which renders it to be ultra-thin (1.5-3λ₀), and relatively error-tolerant. In the recent past, there have been several reports in the literature on the design and fabrication of various terahertz DOEs; primarily; in the area of diffractive terahertz lens design, where a demonstration of compact, large aperture, and aberration-free lenses had already been shown. However, the biggest challenge is the lack of a systematic framework towards the design of DOEs at terahertz wavelengths. In this manuscript, we highlight our recent findings on that by enabling a computational design -based approach towards the modeling of terahertz DOEs; optimal DOE solutions with reduced (up to > 10X-100X time faster convergence) computational costs are indeed possible. This is enabled by the careful utilization of a robust scalar diffraction -based wave propagation model in combination with an optimization-based search algorithm; namely, the Gradient Descent Assisted Binary Search (GDABS) algorithm.

Citation Download Citation

Sourangsu Banerji and Berardi Sensale-Rodriguez "3D-printed diffractive terahertz optical elements through computational design", Proc. SPIE 10982, Micro- and Nanotechnology Sensors, Systems, and Applications XI, 109822X (13 May 2019); https://doi.org/10.1117/12.2518805

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