Review Reports

Round 1

Reviewer 1 Report

The authors reported the coupling of photonic and plasmonic modes for double nanowire cavities. A redshift of the resonant frequency of symmetric mode and a blueshift of the resonant frequency of antisymmetric mode were observed with the decrease of spacing between nanowires. The Q factors of antisymmetric supermodes of double nanowires can be greatly improved, when comparing with single nanowire cavity modes. The mechanisms of Q factor improvement for photonic modes and plasmonic modes were studied based on the field distribution of radiations from the modes. It is a good paper and needs minor revision by the following comments.

1. The references for research status need to be updated.

2. I suggest that the authors include a discussion on relevant papers including Nanophotonics, 2022, 11(3): 603–611, Journal of Physical Chemistry C, 2022, 126, 17141−17151, Nanomaterials, 2022, 12, 1242: 1–25, Materials, 2021,14, 2230.

3. Whether the coupling of photonic and plasmonic modes for double nanowire cavities has universality, otherwise it is recommended to add “perovskite” to the title.

4. As a contrast, the size of coupled photonic DNC and coupled plasmonic DNC should be consistent? Please explain.

Author Response

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Author Response File: Author Response.docx

Reviewer 2 Report

The manuscript reports a numerical study on the coupling effects of double nanowire (DN) cavities for both photonic and plasmonic modes. This is an interesting topic for research fields of nanowire lasers and nanowire laser arrays. Mode splitting is observed where the resonant frequencies of longitudinal symmetric mode and antisymmetric mode of different mode indices can overlap. This frequency overlap (disadvantage) should be taken into account when one wants to design a single mode DN laser. On the other hand, the higher Q factors of the antisymmetric modes are advantageous which might be applied in DN lasers. The presented mechanism for the Q factor changes are reasonable. I recommend that this paper be accepted for publication after minor revisions:

1) Please specify the chemical formula of the hybrid perovskite semiconductor used in the manuscript.

2) There are some typos in the text, including subscripts and superscripts. Please check the manuscript carefully and correct them.

Author Response

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Author Response File: Author Response.docx

Reviewer 3 Report

Please see attached.

Comments for author File: Comments.pdf

Author Response

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Author Response File: Author Response.docx

Reviewer 4 Report

The manuscript entitled “Coupling of Photonic and Plasmonic Modes for Double Nanowire Cavities” by Pen et al. is devoted to study of the coupling between the two optical cavities represented by nanowires. The manuscript contain some interesting results on the occurrence of symmetric and antisymmetric modes.

I believe, the paper should proceed major revision before the acceptance for publication.

Please address the following comments:

1) The introduction lacks discussion of some important late results on the photonic properties of nanowires as optical cavities, e.g. [10.1126/sciadv.aat8896], [10.3390/nano13010056], [10.1063/5.0045834],  [10.1039/D2NR04571K], [10.1088/1361-6463/ab7d68].

2) Why did authors choose the refractive index for dielectric NWs of 2.59-0.015i and what perovskite compound is under consideration? Also, it should be discussed why scalar refractive index instead of its tensor representation has been used?

3) From the text it is not quite clear what are the numerical simulations parameters (mesh shape, type and spatial step size) and software was utilized for the calculations.

4) As I understood, there was the comparison between two cases: perovskite NWs in air and perovskite NWs on Ag substrate. In my opinion it would be great to demonstrate the influence of dielectric substrate (for example SiO2) to take into account the effects of field delocalization and its displacement into the substrate because it could critical for Q-factor.

5) It is not clear why there are two sets of Symmetric+AS plots in Fig. 1f and Fig. 3c? Why there are two vertical axes with the right one being longer wavelength?

Author Response

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Author Response File: Author Response.docx

Round 2

Reviewer 4 Report

The authors have addressed all the comments adequately.

The only concern to the revised versiion: I consider the authors to put paragraph started with "Hybrid perovskite (CH3NH3PbI3) is chosen as the material of the nanowires in..." - form the discussion into the  section 2 "Coupling of double nanowire cavities for photonic mode".

The rest is good to go publishing.

Author Response

Dear reviewer,

 

Thank you very much for your advice. We have revised the manuscript as the suggestion.

 

Yours sincerely,

Xuanran Peng

Email: pengxuanran@semi.ac.cn

Corresponding author: Zhaofeng Li

Email: lizhaofeng@semi.ac.cn