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Manuscript ID: xxxxxxx Type: Regular
Title: xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
Author: xxxxxxxxxxxxxx
Dear Sir/Madam:
A decision has been made on the above manuscript. As a co-author, I thought you'd be interested in seeing the referee comments. In view of their recommendations, I cannot accept the manuscript for publication in Optics Letters. If there are no reviewer comments below, please contact the corresponding author to view them.
Sincerely,
xxxxxxxxxx
Topical Editor, Optics Letters
---------------------------
Reviewer comments are provided here:
Reviewer 1
The paper presents a study of light tunneling through a metamaterial around the negative-zero-positive frequency, tracing parallels to similar effects and results obtained in electron transport in graphene. The lateral shift is shown to vary from positive to negative values depending on which side of the Dirac Point the simulations is performed. Results for tunneling time and velocity are also presented.
My recommendation is that this work should be accepted with a few changes pointed below.
1 - Missing reference at "It has been shownthat,when ¦Øep=¦Ømp=¦ØD and ¦Ã=0 (noloss), the dispersion of the NZPIM satisfies a linear equation k2(¦Ø)=(¦Ø−¦ØD)/¦ÔD."
2 - In the text where fig 2a and b are explained, the authors referred to "the saturation value" when they seem to mean the magnitude (abs) of this value.
3 - The numerical values for some parameters could not be found in the paper, making it impossible to reproduce, in special ¦ØD and ¦Ã.
4 -Ref. 16 is wrong; the correct volume for this publication is 65, not 4. Please check other references carefully.
5 - The authors seem to use ¦Ã=0, but that is not explicit in the paper. If that is the case, it's important to discuss the effects of a larger ¦Ã, specially since all current metamaterial implementations show significant losses. How would those impact the results in an experimental setup?
Reviewer 2
The authors discussed the interesting Goos-Hanchen shift and Hartman effect in negative-zero-positive index materials (NZPIMs). I really approciate the selection of this topic while there are quite some questions to be answered in the current manuscript and quite some corrections are needed.
1. One interesting property of a NZPIM is the refractive index can be negative, positive and ZERO. The authors discussed the properties at frequencies with either negative and positive material while left zero-index material intact;
2. The hartman effect in NZPIM is to be discovered and I am expecting to obtain some physical explanation of the saturation time/length, for instance the magnitude or the origin. While I don't see any explanation but only numerical observations;
3. The dramatic change of tunneling time when barrier thickness is an interesting observation. It can vary from negative to positive. The author need to present more results (at least more incident angles) before a conclusion is drawn due to "linear dispersion of NZPIM" though I can barely follow the logic;
4. Figure 2 is poorly organized. symbols are missing in legend. Given the extra space left, my advice is to seperate Figure 2;
5. I guess, wD, an important parameter is set at 10GHz while it never appear anywhere in the main text;
6. Equ (1) and (2) are for e2 and u2 instead of e1 and u1. Equ (8) is unreadable. Even a typo at address.
Unfortunatly, I cannot recommend the publication of this manuscript based on current quality.
[ Last edited by avast2009 on 2013-6-19 at 21:12 ] |