Hat-Top Beams for Generating Tunable THz Radiations Using a Medium of Conducting Nanocylinders

Round 1

Reviewer 1 Report

Perhaps the authors may disagree with me, but as far as I’m concerned, there are not any experiment simulations nor sketches illustrating the system's practical functioning (i.e., nanocylinders in a medium interacting with the laser beams). Personally speaking, this essay would have been more interesting to the researchers and the readership of the topic, if these elements were included.

I placed some annotations and suggestions throughout the manuscript to be checked thoroughly by the authors.

Comments for author File: Comments.pdf

Author Response

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Author Response File: Author Response.docx

Reviewer 2 Report

Unfortunately the paper is lack of the experimental investigation of the THz signal generation and its tunability. I also suggest authors to decrease the number of references in the manuscript. The content of the paper is mainly based on the theory and simulation. Thus I regret to say that the paper should not be accepted.

Author Response

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Author Response File: Author Response.docx

Reviewer 3 Report

Authors in this article have proposed and demonstrated the generation of THz radiation by the interaction of two hat-top laser beams with the medium containing graphite nanocylinders, as these beams result in highly nonlinear interaction because of a smooth dip in their peak intensity and a fast rise and fall in the overall intensity pattern. The idea and concept of the paper are interesting, and promising results have been achieved and then validated. The proposed design validity can be increased by providing a fair comparison with prior and recent arts. The proposed design seems to be attractive for electromagnetic and communication societies which are dealing with millimeter-waves and terahertz components. However, prior to final recommendation the paper's organization needs to be improved and the following points should be carefully addressed within the manuscript to improve its quality.

1) The target of the proposed work should be more clarified and discussed in the abstract. To have more space in this section, please note that first two sentences of this part are more related to the introduction and then they can be removed.

2) It would be nice also to add some numerical results in the abstract section to better following the work by readers.

3) At the end of the abstract section please highlight the advantages and possible disadvantages of the proposed work along with its practical applications.

4) Introduction section is not well referenced. For example antenna systems are very important for THz applications which need to be mentioned in the introduction section along with proper references. In below there are appropriate suggestions.

"On-Chip Antenna Design Using the Concepts of Metamaterial and SIW Principles Applicable to Terahertz Integrated Circuits Operating over 0.6–0.622 THz" International Journal of Antennas and Propagation, Volume 2020, Article ID 6653095, 9 pages, https://doi.org/10.1155/2020/6653095.

"High-Isolation Antenna Array Using SIW and Realized with a Graphene Layer for Sub-Terahertz Wireless Applications", Scientific Reports, 11, 10218, 2021.

"Study on on-Chip Antenna Design Based on Metamaterial-Inspired and Substrate-Integrated Waveguide Properties for Millimetre-Wave and THz Integrated-Circuit Applications", Journal of Infrared, Millimeter, and Terahertz Waves 42, 17–28 (2021).

"High-Gain On-Chip Antenna Design on Silicon Layer with Aperture Excitation for Terahertz Applications", IEEE Antennas and Wireless Propagation Letters, vol. 19, no. 9, pp. 1576-1580, Sept. 2020.

5) Some interesting equations have been presented in the manuscript. Authors are requested to provide more elaborations on how to extract them? This will help readers to better understanding the concept of the paper.

6) In sections 2 and 3 authors have discussed the "origination of ponderomotive force", and "nonlinear current and THz generation". It would be nice to support these parts with some plots or figures.

7) Dependence of efficiency on the normalized frequency for different values of beam width ?₀ and ripple density are presented in Fig.5. Please provide more discussions on this figure.

8) To increase the validity of the proposed work it is suggested to compare it with state-of-the-art literature. The results from this comparison can be summarized in a table. This section can be added before the conclusion section.

9) Conclusion section can be more supportive adding some numerical achievements. The style of conclusion is not also usual. Please modify it.

10) Reference part needs to be improved by a proper extension as per suggested above.

Author Response

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Author Response File: Author Response.docx

Round 2

Reviewer 1 Report

The manuscript describes a theoretical essay on how to generate a tunable THz radiation by the interaction of two top-hat laser beams using graphite nanocylinders.

It seems the manuscript has been extensively improved with sketches illustrating the system's practical functioning (i.e., nanocylinders in a medium interacting with the laser beams). In my standpoint, all in all, the authors have successfully gone over manuscript, and looks now well done.

Author Response

Thank you very much for appreciating the revised manuscript.

Reviewer 2 Report

I repeat myself that unfortunately the paper is lack of the experimental investigation of the THz signal generation and its tunability. The content of the paper is mainly based on the theory and simulation. The research should be extended with the experimental study. And the theoretical study/simulations should be supported by experimental results. Thus I regret to say that the paper should not be accepted.

Author Response

"Please see the attachment"

Author Response File: Author Response.pdf