Numerical Analysis of Structural Color for Photonic Crystal Hydrogel
Round 1
Reviewer 1 Report
In this paper, the authors design and control the structural color of photonic crystal through controlling of colloidal particle size, temperature and humidity changes, and carried out numerical analysis of the CIELAB color space to explore the color regulation method for photonic crystal hydrogel. This is an interesting work, but some points should be addressed.
1. There are many abbreviations without giving any definition. Abbreviation should be given at the first time in use. For example, CIELAB, RGB, CRT, CC, and etc.
2. The Table 1-Table 4 in the supplementary material should be described in the manuscript and changed into Table S1-Table S4.
3. The Table 5 should be changed into Table.
4. The Fig.5 should be Fig.3 and resupplied.
5. The English need to be polished. Some spelling mistakes and language expressions should be checked carefully during the revision.
Author Response
Thank you very much for your review, we have made corresponding modifications. Please see the attachment.
Author Response File: 
Author Response.docx
Reviewer 2 Report
The authors investigated the structural color of the hydrogel photonic crystal structure. It aimed to investigate the influence of particle size, temperature and humidity on the color change. The work may be interesting, but the current manuscript is much lower than the standard of this journal. I list the questions below.
1. The title is “Numerical analysis…”, but the main text seems to give the experimental contents, not “numerical”.
2. The introduction is too lengthy. It should focus on the main point of this study. Besides, some very related works seems to be missing, such as the magnetically “responsive photonic”, which may be worth surveying. An example is IEEE Sensors Journal 22(24), 23786-23792 (2022).
3. The “Figure 2” on Page 2 should be “Figure 1”.
4. The details of the fabrication should be provided, such as the reagents. It is necessary to provide the micrographs and characterization for the as-fabricated polystyrene microspheres.
5. Fig. 2 gives the mains results, but the resolution is too low and it is hard to understand.
6. The “Table 5” in the text should be “Table 1”. The tables in the supporting information should not be numerated with the main text together.
7. The analysis of the physical mechanism accounting for the observed phenomena seems to be too weak.
8. “FIG. 3” in Line 240-241 is not found in the text. Fig. 5 is not necessary as it is very fundamental. The Chinese characters should not be given in Fig. 5. Fig. 4 is not found.
9. It is suggested to give the spectral variation with the external parameters, such as temperature, humidity.
10. The authors concluded that “the manipulation law of particle size, temperature and humidity on the color change of photonic crystal hydrogel is verified…”. More experimental details and results should be presented in the main text.
Author Response
Thank you very much for your review, we have made corresponding modifications. Please see the attachment.
Author Response File: Author Response.docx
Reviewer 3 Report
In this research study, the authors designed and controlled the structural color of photonic crystal through controlling of colloidal particle size, temperature and humidity changes, and carried out numerical analysis of the CIELAB color space to explore the color regulation method for photonic crystal hydrogel.In general, the idea of the paper may have some novelty. However, the present form of this paper is not suitable for publication. I believe that this study needs for a MAJOR revision to be suitable for publication in PHOTONICS Journal. The authors should carefully consider the following: -
1- The abstract must be rewrote and reorganized to present a clear and simple description of the idea of the paper.
2- The introduction contains many abbreviations such as RGB, CRT and CC that must be defined.
3- Although the mainstay of this paper is about photonic crystals, the introduction does not contain sufficient information about the characteristics and the role of photonic crystals in the different applications.
4- The author devotes ample space to the discussion of the different types of photonic crystals. I think that this part should be summarized.
5- The authors should mention the novelty of their work over the previous published papers.
6- Although the title of the manuscript contains the item, "numerical analysis", there is no any discussion about the theoretical framework or the initial conditions regarding the considered software such as the meshing size and the boundary conditions.
7- The parameters in equation (1) should be clearly defined and explained.
8- The materials used in the design of your photonic crystals should be defined besides the explanation of the reasons behind your choice.
9- The refractive indices of the considered materials should be mentioned and discussed.
10- The authors should consider the transmission spectra of the suggested design.
11- The authors should mention the equations that govern the role of temperature and humidity on the constituent materials.
12- Figure (5) must be modified especially it contains a mix of English and Chinese.
13- The conclusion should contains some numeric values.
Author Response
Thank you very much for your review, we have made corresponding modifications. Please see the attachment.
Author Response File: Author Response.docx
Round 2
Reviewer 2 Report
The authors have revised the manuscript to a certain extents according to the previous comments. It may be acceptable for Photonics this time.
Further minor correction: the cited Ref. 32 in the reference list should be transfered into English.
Author Response
Thanks for your advice, we fixed some language errors and redrew Figure 2. Please see the revised version.
Reviewer 3 Report
The paper could be accepted in it's present form
Author Response
Thanks for your advice, we fixed some language errors and redrew Figure 2. Please see the revised version.
