Four-Polarisation Camera for Anisotropy Mapping at Three Orientations: Micro-Grain of Olivine
, Daniel Smith 2,†, Meguya Ryu 3, Soon Hock Ng 2, Hsin-Hui Huang 2, Pegah Maasoumi 2, Jitraporn Vongsvivut 4, Daniel Moraru 5, Tomas Katkus 2, Saulius Juodkazis 2,6,* and Junko Morikawa 1,6,*
Round 1
Reviewer 1 Report
Dear Authors,
In the study, four polarization cameras were used to map the absorption of olivine microparticles before and after high temperature annealing. Different operating modes of the polarization controlled polariscope were used before and after the sample in transmission and reflection modes.
This work adds to the literature by using polarization-resolved imaging at visible wavelengths (and comparable resolution) to map the complex morphologies of naturally occurring microcrystals.
The paper is generally well written, but the following minor corrections are required:
1. The advantage of the method should be emphasized by comparing it with other techniques in the literature.
2. The obtained data should be compared numerically with the literature and the accuracy of the method should be verified.
3. The scope of the method should be specified by applying it to different materials.
4. The results section should be expanded to be more inclusive.
Regards,
Minor editing of English language required.
Author Response
Only critical remarks answered:
In the study, four polarization cameras were used to map the absorption of olivine microparticles before and after high temperature annealing. Different operating modes of the polarization controlled polariscope were used before and after the sample in transmission and reflection modes.
This work adds to the literature by using polarization-resolved imaging at visible wavelengths (and comparable resolution) to map the complex morphologies of naturally occurring microcrystals.
The paper is generally well written, but the following minor corrections are required:
1. The advantage of the method should be emphasized by comparing it with other techniques in the literature.
Answer. It is done by comparison of fig 5 (3 points method introduced in this study) which is compared with 4 points method shown in fig 3. there are no other optical methods to determine anisotropy from single measurement. several separate measurements needs to be carried out for the same result, but are not reliable due to lateral shifts of the image. this is already discussed in introduction.
2. The obtained data should be compared numerically with the literature and the accuracy of the method should be verified.
Answer. Fig 3 vs 5 are compared by showing standard deviation.
3. The scope of the method should be specified by applying it to different materials.
Answer. Indeed this is important and is discussed in conclusions and outlook section.
4. The results section should be expanded to be more inclusive.
Answer. The current version is already long and shows detailed analysis at different polarisations in reflection and transmission modes. The purpose of the study was to introduce 3-point approach in detection of anisotropy and has been already achieved with this length. We consider that results section is already detailed enough.
Reviewer 2 Report
The article is devoted to the description of one of the possible applications of the four-polarisation camera: for polarization analysis at visible spectral range of 3D complex samples which are usually further scrutinized under IR and THz spectral range. The main attention is paid to the method of applying the four-polarization camera. The results of approbation of this method in the study of olivine are also presented. In particular, it is shown that high temperature annealing of olivine xenolith at above 1200∘C in O2 flow makes it magnetized.
On the whole, the article makes a positive impression: the installations and methods used are fully disclosed, the conclusions are substantiated, etc. But in accordance with the theme of the «Coatings» and this special issue of «New Advances in Novel Optical Materials and Devices», it is better to describe in more detail the mineral analyzed in the article - olivine.
Сomments:
1) It is recommended to exclude formulas from the annotation.
2) Not enough references:
- In the first paragraph of the introduction.
- After the thesis «Usually, such 0.1-1 mm grains are analysed at IR wavelengths at the chemical fingerprinting spectral range of λ (12 - 2) μm (in wavenumbers = (833 - 5000) cm-1), where spatial resolution is markedly reduced ∝ λ.» (line 36).
- After the thesis «Moreover, the crystalline and glass absorption at specific phonon modes defining micro-volumes of specific materials/crystals is carried out even at the longer wavelengths in THz domain with wavenumbers 20 - 700 cm-1 or λ = (500 - 14) μm at a further reduced spatial resolution» (line 39).
- Lines 62-63. Provide a link to a source that describes in detail the principle of operation and the device of the four-polarization camera.
3) The article should describe in more detail the mineral used (olivine). For example, its structure (crystal cell), basic properties, etc.
4) References to figures are given in the text out of order. This makes it difficult to understand the material.
Author Response
Thank you. Only critical remarks have been answered:
The article is devoted to the description of one of the possible applications of the four-polarisation camera: for polarization analysis at visible spectral range of 3D complex samples which are usually further scrutinized under IR and THz spectral range. The main attention is paid to the method of applying the four-polarization camera. The results of approbation of this method in the study of olivine are also presented. In particular, it is shown that high temperature annealing of olivine xenolith at above 1200∘C in O2 flow makes it magnetized.
On the whole, the article makes a positive impression: the installations and methods used are fully disclosed, the conclusions are substantiated, etc. But in accordance with the theme of the «Coatings» and this special issue of «New Advances in Novel Optical Materials and Devices», it is better to describe in more detail the mineral analyzed in the article - olivine.
Сomments:
1) It is recommended to exclude formulas from the annotation.
Answer: Formulas are very simple and allows more dense packing of information. We prefer to keep current style.
2) Not enough references:
- In the first paragraph of the introduction.
Answer: Aim of references is to introduce prior concepts and results. They are used for that purpose and we consider it is enough.
- After the thesis «Usually, such 0.1-1 mm grains are analysed at IR wavelengths at the chemical fingerprinting spectral range of λ (12 - 2) μm (in wavenumbers = (833 - 5000) cm-1), where spatial resolution is markedly reduced ∝ λ.» (line 36).
Answer: added.
- After the thesis «Moreover, the crystalline and glass absorption at specific phonon modes defining micro-volumes of specific materials/crystals is carried out even at the longer wavelengths in THz domain with wavenumbers 20 - 700 cm-1 or λ = (500 - 14) μm at a further reduced spatial resolution» (line 39).
Answer: added.
- Lines 62-63. Provide a link to a source that describes in detail the principle of operation and the device of the four-polarization camera.
Answer. Required information is introduced at the Methods section. Also catalog number in Thorlabs is given.
3) The article should describe in more detail the mineral used (olivine). For example, its structure (crystal cell), basic properties, etc.
Answer: crystal cell is added.
4) References to figures are given in the text out of order. This makes it difficult to understand the material.
Answer. Thank you. Mended.
Reviewer 3 Report
The article calls: "Four-polarisation camera for anisotropy mapping at three orientations: micro-grain of olivine" and concerned of polarimetry measurements of material under test. The advantage of article is technique of measurement and long references list (23 ones).
The main disadvantage of article is absence of explanation of object under research (micro-grain of olivine). Why has chosen such object of research?
Author Response
Replies to:
The article calls: "Four-polarisation camera for anisotropy mapping at three orientations: micro-grain of olivine" and concerned of polarimetry measurements of material under test. The advantage of article is technique of measurement and long references list (23 ones).
The main disadvantage of article is absence of explanation of object under research (micro-grain of olivine). Why has chosen such object of research?
Answer: We have explained that olivine was used as a prototype material for characterisation of anisotropies at visible and IR spectral ranges. This and followed by a short explanation of importance of olivine. We consider this to be enough for the current study. We are currently working of a continuation of this first study and will devote more space for description of Olivine. In particular, future studies will look for correlation between optical anisotropies and change of magnetic properties. Few edits added in revision.
