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Article
Peer-Review Record

Considering Grayscale Process and Material Properties for Robust Multilevel Diffractive Flat Optics

Photonics 2024, 11(12), 1200; https://doi.org/10.3390/photonics11121200
by Diogo E. Aguiam *, Ana Dias, Manuel J. L. F. Rodrigues, Aamod Shanker, Filipe Camarneiro, Joana D. Santos, Pablo Valentim, Joao Cunha and Patrícia C. Sousa
Reviewer 1: Anonymous
Reviewer 2: Anonymous
Photonics 2024, 11(12), 1200; https://doi.org/10.3390/photonics11121200
Submission received: 29 November 2024 / Revised: 11 December 2024 / Accepted: 18 December 2024 / Published: 20 December 2024
(This article belongs to the Special Issue Recent Advances in Diffractive Optics)

Round 1

Reviewer 1 Report

Comments and Suggestions for Authors

The authors undertook a study of multilevel diffractive optical elements in particular looking at the impact of various design and fabrication parameters on the final element performance. Finally they did an experimental demonstration of such an element.

Overall the paper was well written and very informative on the many aspects of DOE fabrication which would be of interest to researchers in this field, hence I recommend publication. I have some comments below which should be addressed.

1. There is a comma or full stop at the end of the equations which should be deleted

2. Line 187 seems to be incomplete or missing a word“ Nonetheless, there is a spectral region around the design wavelength where the efficiency at the desired focal point 𝑓0”

3. Figure 6a, the refractive index was experimentally measured, but no experimental details seem to be given

4. Table 1, Pixel size should be delta x, delta y ( I presume..)

5. In Figure 7b the left axis is listed at Height [um] instead of micron.

6.In  Figure 8 the profilometer lines are very hard to see, you should change to a darker color. Also the numbers/labels are not very visible.

 

 

Author Response

Dear Reviewer,

Thank you very much for taking the time to review this manuscript and for your constructive feedback. Please find in attachment the detailed responses and the corresponding manuscript revisions highlighted and in track changes in the re-submitted files.

Thank you,

Diogo Aguiam

Author Response File: Author Response.pdf

Reviewer 2 Report

Comments and Suggestions for Authors

In this manuscript, the authors we evaluate the impact of the greyscale laser lithography resolution and geometry constraints on the efficiency of surface relief diffractive lenses, and analyse the process parameter space that limit lens performance. Overall, this is a meaningful work with reasonable theoretical analysis and experimental verifications. However, several points must be carefully addressed before the paper can be accepted for publication.

1. According to Equation (3), It seems that the diffraction efficiency is related with the incident wavelength. Can the author explain the inner relationship between the incident wavelength and the diffraction efficiency.

2. For the fabrication process, whether there is a splicing problem during the DLW process, how it affect the focusing performance?

3. It seems the depth of focus of the experimental results much larger than the simulation results. Pls explain the reason.

Comments for author File: Comments.pdf

Author Response

Dear Reviewer,

Thank you very much for taking the time to review this manuscript and for your constructive feedback. Please find in attachment the detailed responses and the corresponding manuscript revisions highlighted and in track changes in the re-submitted files.

Thank you,

Diogo Aguiam

Author Response File: Author Response.pdf

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