Version 1
: Received: 27 August 2020 / Approved: 30 August 2020 / Online: 30 August 2020 (11:03:51 CEST)
How to cite:
Gurwich, I.; Greenberg, Y.; Harush, K.; Tzabari, Y.T. Enhancement of the Transparency and Flatness of Engraved Facets in a Broadband Range by Optimizing Its Engraved Structure. Preprints2020, 2020080656. https://doi.org/10.20944/preprints202008.0656.v1
Gurwich, I.; Greenberg, Y.; Harush, K.; Tzabari, Y.T. Enhancement of the Transparency and Flatness of Engraved Facets in a Broadband Range by Optimizing Its Engraved Structure. Preprints 2020, 2020080656. https://doi.org/10.20944/preprints202008.0656.v1
Gurwich, I.; Greenberg, Y.; Harush, K.; Tzabari, Y.T. Enhancement of the Transparency and Flatness of Engraved Facets in a Broadband Range by Optimizing Its Engraved Structure. Preprints2020, 2020080656. https://doi.org/10.20944/preprints202008.0656.v1
APA Style
Gurwich, I., Greenberg, Y., Harush, K., & Tzabari, Y.T. (2020). Enhancement of the Transparency and Flatness of Engraved Facets in a Broadband Range by Optimizing Its Engraved Structure. Preprints. https://doi.org/10.20944/preprints202008.0656.v1
Chicago/Turabian Style
Gurwich, I., Kobi Harush and Yarden Tzabari Tzabari. 2020 "Enhancement of the Transparency and Flatness of Engraved Facets in a Broadband Range by Optimizing Its Engraved Structure" Preprints. https://doi.org/10.20944/preprints202008.0656.v1
Abstract
Achieving devices to be transparent is the task considered in the last time in many aspects and for different purposes. One issue of these problems is making anti-reflective surfaces in a wide wavelength range and keeping it flat enough. The authors of the previous publication showed that one could enhance a flat facet's transmission efficiency by suitable engraving. They used smoothed conical fingers and holes. Here, we widen the class of anti-reflective metasurfaces under consideration, following the requirements of the model developed in the previous paper. We involve also smoothed pyramidal fingers. The obtained results provide the improved engraved structure, with parameters dependent on the required spectral range, and the facet format. The predicted level of transmittance is close to 99\%, and the flatness(estimated by the standard deviation) as 0.2\%. This improvement is significant enough for high and broadband transmittance. In this work, we show that the randomization of the engraving parameters does not provide any significant effect for small facets. We also discuss a simple way of comparing experimental and theoretical results for a waveguide with the considered input and output features. In this study, as well as in our previous work, we restrict ourselves by rectangular facets. We also discuss the limitations that originated from the size and shape of the waveguide facets.
Keywords
transmission; engraving; unit-cell; fingers; facet; gradient index
Subject
Physical Sciences, Optics and Photonics
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
