Optical Response of CVD-Grown ML-WS2 Flakes on an Ultra-Dense Au NP Plasmonic Array
, Lorenzo Ramò 1, Domenica Convertino 2,3, Giorgio Orlandini 2, Simona Pace 2,3, Ilya Milekhin 4,5, Michele Magnozzi 1, Mahfujur Rahaman 4,5, Dietrich R. T. Zahn 4, Camilla Coletti 2,3, Maurizio Canepa 1 and Francesco Bisio 6,*Round 1
Reviewer 1 Report
I understand the relevance of the topic. I understand that a lot of work has been done in order to fabricate these materials. However I fail at understanding if there is any novelty. The study presents some basic characterisation of the fabricated material.
As a suggestion, measuring the optical transmittance with an out-of-plane polarized light (illumination under oblique incidence) could bring a more visible interaction between the two components of the hybrid system.
Author Response
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Reviewer 2 Report
In this manuscript the authors present an interesting analysis on the optical response of CVD-grown ML-WS2 flakes on an ultra-dense Au NP plasmonic array. The manuscript is clear, well organized and nicely presented.
I have only small suggestions before the acceptance:
- Since the LSPR peak is highly influenced by the shape and size of the gold nanoparticles, how much are these parameters important in this kind of analysis?
- Regarding the hybrid system, in Figure 2c are shown the micro-absorbance spectra as a function of the LiF dielectric thickness (t). Can the authors give more detail on why the LSPR peak fades at increasing t?
- I would also suggest to change the color of the spectra in Figure 2 since the ones related to t=0nm and t=3nm are not distinguishable.
- Some typos are present in the text, please check.
Author Response
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Reviewer 3 Report
In the manuscript, the authors prepared a hybrid system of monolayer WS2 flakes grown by chemical vapour deposition and ML-WS2 on a densely-packed array of Au nanoparticles, and investigated the optical properties of ML-WS2 flakes and ML-WS2 on Au NPs. In the 75-350 K range, the optical response was measured as a function of the thickness of a dielectric spacer intercalated between the two materials and of the system temperature of ML-WS2 and ML-WS2 /Au NPs. The idea of the manuscript seems applicable. There are some issues that need to be addressed:
Point 1: The closely-packed array of the plasmonic Au nanoparticles promotes a high confinement of the electromagnetic field, whether it can be illustrated by electric field distribution diagram?
Point 2: The increasing of thickness of the intercalated LiF layer will lead to a gradual redshift of the LSPR in Figure 2 (b), the author should discuss and add the physical mechanism.
Point 3: What are the practical applications of the hybrid system of monolayer WS2 and ML-WS2 on a densely-packed array of Au nanoparticles?
Author Response
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Round 2
Reviewer 3 Report
I think the article can be accepted now.
Author Response
Dear Reviewer,
thank you for your reply.
With best regards,
on behalf of all co-authors,
Marzia Ferrera and Francesco Bisio
