Dual-Wavelength Polarization Multifunction Metalens Based on Spatial Multiplexing
Round 1
Reviewer 1 Report
Comments and Suggestions for AuthorsIn this work, the authors proposed a spatial multiplexing method to achieve dual-wavelength multiplexed metalenses. It tries to demonstrate the feasibility of working at discretized wavelengths, which is beneficial for compact and multifunctional optoelectronic devices. However, I cannot recommend it to be accepted because of the inconsistent arrangement of the context.
1. In Figure3, the authors proposed two spatial multiplexing schemes, including fan-shaped sparsity and annular sparsity. However, only fan-shaped sparsity was discussed in Figure 4. And the random design comes suddenly and the annular shape is not mentioned at all. So the content is not consistent.
2. For experimental validation, only the result at a single frequency is shown with x and y polarization excitations. The function of dual band is not mentioned, which is incomplete.
3. In Figure 10, the field pattern in (b) and (d) is not consistent. So I doubt about the accuracy of the result.
4. The bandwidth expansion is actually another design using a newly built data pool. So it does not add much significance.
Author Response
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Author Response.pdf
Reviewer 2 Report
Comments and Suggestions for AuthorsIn the submitted manuscript, the authors have shown a large aperture and dual-function multiplexing metalens in the mid-wave infrared region. Specifically, they using FDTD method numerically and give the fabricated sample experimentally to showcase the performances of this hybrid all-dielectric metasurface. This manuscript is suggested to be major revision before final decision. The comments are given below.
1. In the Introduction part, the state-of-the-art dual-wavelength or multiple band metalenses are not included. The literatures review are not complete and lacking some important papers, e. g.:
[1] Baek, S., Kim, J., Kim, Y., Seok Cho, W., Badloe, T., Moon, S. W., ... & Lee, J. L. (2022). High numerical aperture RGB achromatic metalens in the visible. Photonics Research, 10(12), B30-B39.
[2] He, M., Wu, J., Chen, H., Wang, H., Wu, X., Feng, Q., ... & Wu, L. (2024). High efficiency independent modulation at dual-wavelength based on Pancharatnam–Berry and propagation phases. JOSA B, 41(5), 1076-1083.
[3] Xu, F., Liu, P., Chen, W., Li, M., & Chen, Y. (2024). Polarization-modulated dual-wavelength metalens to overcome the diffraction limit. Optics Communications, 572, 130975.
2. Fig. 1 gives the transmission of meta-atom. The pictures of unit cell should be added in a separate figure with its detailed structural parameters.
3. The comprehensive performances of this dual-function metalens should be compared to the-state-of-the-art dual-wavelength metalens by spatial multiplexing, e. g., focusing efficiency, NA, aperture size and so on.
4. The abstract is too short. The detailed focusing performances from simulation and measurement results should be added to show its novelty of this work. It is suggested to refer to: Nanomaterials 2024, 14, 513.
5. In section of “Results and discussion”, it would be helpful if the discussion included a comparison of the findings with other published works. Such a comparison would strengthen the novelty and significance of the current work. Additionally, it is advisable to consider the provision of tables to assist with the comparative data visualization.
6. How about the working angle on oblique incident of proposed dual-wavelength or dual-function metalens? It is suggested to refer to some recent works: Optical Materials, 134, 113105. and Materials & Design, 240, 112879.
Author Response
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Author Response File: Author Response.pdf
Reviewer 3 Report
Comments and Suggestions for AuthorsThe authors present a dual-wavelength polarization multifunction metalens using spatial multiplexing, targeting 3.75 μm and 4.25 μm in the mid-wave infrared spectrum. They achieve high phase fidelity, scalability, and dual-functionality, validated through simulations and experiments. Eventhough recently alot of work is done on multifuctional metasurfaces but still i think this work have suffecient novelity to get published. The methodology and results also look ok. I recommend accepting this manuscript for publication.
Comments on the Quality of English Languagecan be improved.
Author Response
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Round 2
Reviewer 1 Report
Comments and Suggestions for AuthorsThe issues have been addressed in the revised version. I think it can be accepted.
Author Response
We sincerely appreciate your thorough review of our manuscript submitted to Photonics. We are delighted to know that you have recommended acceptance of our paper, and we are deeply grateful for your valuable feedback and support throughout the review process.
Reviewer 2 Report
Comments and Suggestions for AuthorsThe revised manuscript gives some new results and performance comparisons to previous works. However, the detailed focusing comparisons in the Table 1 can be added to further enhance its quality of this work.
Author Response
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Author Response File: Author Response.pdf
