The Role of the Directivity of Various THz Detectors in Multiplexing Systems
Round 1
Reviewer 1 Report
The authors present the role of the directivity of various THz detectors in
multiplexing systems. They design three-focal-spot diffractive lenses and also optimize and manufacture them to verify the influence of focal length, focal position shift, and deflection angle on the proper detection and separation of focal spots using different receivers. They also present recommendations for the best setup in various settings.
Their methodology is sound and well explained. Experiments in different settings have been performed and methods for THz optics with small f-number values have been characterised.
Author Response
Dear reviewer,
Thank you for taking the time to review our manuscript.
The article has been additionally verified by the English lector and some grammatical improvements have been applied. All changes in the text are marked in red.
Best regards,
Paweł Komorowski, on behalf of all co-authors
Reviewer 2 Report
Decision: Accept for publication.
Author have done good job.
In this article, authors has present a complex analysis of the applicability of various detectors for the characterization of highly convergent and off-axis beams.
Four different detectors have been used in the experimental evaluation. Three of them are based on Schottky diodes and the fourth is based on field-effect transistor (FET).
The experiments have proven that 3D-printed DOEs designed using the iterative algorithm and convolution method of light propagation can efficiently redirect THz radiation into three separate focal spots.
Author Response
Dear reviewer,
Thank you for taking the time to review our manuscript.
The article has been additionally verified by the English lector and some grammatical improvements have been applied. All changes in the text are marked in red.
Best regards,
Paweł Komorowski, on behalf of all co-authors
Reviewer 3 Report
The paper is a study of directivity of various THz detectors and its implications on the possibility of signal multiplexing in THz wireless links. The reported study is detailed and sound, and will be of interest to readers. Minor points:
- It would be helpful to mention in the abstract and introduction that the study refers to wireless communications. The word "wireless" is absent from the manuscript.
- It would be of interest to see the beam pattern from the described lenses characterised using a detector with no input optics, such as a pyroelectric or Golay. Please explain why this was not done.
- Please comment on the absorption losses in the lens materials.
Author Response
Dear Reviewer,
please find our response letter in the attachment.
Best regards,
Paweł Komorowski, on behalf of all co-authors
Author Response File: 
Author Response.docx
