Design of Dual-Band Terahertz Perfect Metamaterial Absorber Based on Circuit Theory

Round 1

Reviewer 1 Report

The authors proposed a design of perfect absorber using graphene metasurface. The authors should answer the following questions:

1. The proposed perfect absorber is narrowband, what is the advantage of it compared to other narrowband perfect absorber?
2. In the paper, the author assumed the conductivity of gold is a constant. In the reality, the conductivity changes with frequency. Will the results change a lot considering the varying conductivity?
3. Although it is a theoretical work, the author should discuss the potential way to fabricate this perfect absorber.

Author Response

Please see the attachment.

Author Response File: Author Response.doc

Reviewer 2 Report

• The authors should clarify the following sentence (see page 4):

"To better material selection and geometry optimization, we consider a central frequency defined as ω₀ = (ω₁ + ω₂)/2 and apply an additional condition on the structure by setting β|_ω=ω0d = π/2"

The authors should explain why they apply this additional condition. What is its physical meaning?

• In order to demonstrate the polarization-insensitive behavior of the proposed metamaterial absorber, the absorption spectrum should be evaluated for different values of the azimuthal angle (ranging from 0° up to 360°) of the impinging plane wave. Please include this information.

 

• Figure 3 is incomplete; I cannot see part (b). Please, add Fig. 3(b).

 

Author Response

Please see the attachment.

Author Response File: Author Response.doc

Round 2

Reviewer 2 Report

The English language is not always adequate, so I suggest to find a fluent English speaker to revise the whole manuscript.