Progress on the Microcavity Lasers Based on Microstructured Optical Fiber

Round 1

Reviewer 1 Report

1. Authors should focus on the fabrication part in each sensor.

2. fig. 10 should be descriptive with other means of similar sensors.

Author Response

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Reviewer 2 Report

Micro cavity lasers are widely applied in bio-chemical sensing, molecular targeted detection, integrated labeling source and optofluidic control. Particularly, micro-structured optical fiber-based laser is expected as a promising candidate for its high-quality factor, low threshold, high integration, and low energy consumption. Moreover, the latest nano technology improves their lasing performances in spectral range, linewidth and circling lifetime. Considering the specificity in this paper, the discussion presented herein focuses on several typical cases of the micro cavity lasers  integrated in micro-structured optical fiber over the past decades. These micro- and nano-scaled lasers are expected to become a priority in next-generation integrated optics and biomedical photonics. 

This review is well written and well organized. I recommend its publication after some minor modifications.

Please cite this WGM work: "Meridian whispering gallery modes sensing in a sessile microdroplet on micro/nanostructured superhydrophobic chip surfaces" , Microfluidics and Nanofluidics 23, 1-13, 2019.

Please cite this Bragg grating filter work "A tunable optical Bragg grating filter based on the droplet sagging effect on a superhydrophobic nanopillar array" Sensors 19 (15), 3324, 2019

Author Response

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Reviewer 3 Report

This review paper summarizes recent progress in the field of micro cavity lasers based on micro-structed optical fiber. It describes typical modes and various gain medium used in the micro cavity lasers. It is a very interesting review with latest published results. However, I still have one question for the authors, although most of the research are still in the stage of proof of principle, could you please make some discussion on the most important factors or parameters that matters the practical use of these mico-structed fibers?

Author Response

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Reviewer 4 Report

The submitted review focuses on micro-cavity lasers on the basis of micro-structured optical fibres. I have the following comments thereabout:

1. It is necessary to explain which resonant cavities are the subject of the work. If they are stand-alone passive micro-cavities, then, probably, they are not lasers, but rather converters of the pump radiation spectrum. If they are stand-alone active micro-cavities, then which active micro-structured fibres are used in them? If these cavities are part of larger laser resonators, then, perhaps, one should speak about them as elements of large resonators. The Authors need to explain in more detail, which new radiation properties (apart from low threshold) are achieved specifically in micro-cavities, and in which particular ones.

2. The review title uses the term “Micro-structed optical fibre”, but such fibre in its conventional understanding (https://www.sciencedirect.com/topics/materials-science/microstructured-optical-fiber) is hardly mentioned. Correspondingly, it is necessary to use a different term for the fibres mentioned in the manuscript.

3. This review has no conclusion. It should be added and appropriate conclusions drawn that follow from the presented analysis in connection with promising solutions.

If these concerns are addressed by the Authors in a further revision of their manuscript, it may be published in Electronics

Author Response

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