Table 2 Comparison between the proposed frequency-multiplexed tunable metamaterial logic device and recent works.

From: Frequency-multiplexed tunable logic device based on terahertz graphene-integrated metamaterial composed of two circular ring resonator array

Ref.

Logic functions

ER range (dB)

Material structure

Dimensions (µm)2

Operating frequency (THz)

Input signal

ECM

17

AND

6.0–14.0

Graphene/SiO2

25.9*25.9

3–7

Phase difference between two input signals

No

XOR

25

OR

12.06–26.3

Graphene/dielectric/

graphene/dielectric/

gold

2*4

5–8

Difference in the Fermi level of resonators

Yes

XNOR

NAND

NOT

26

NAND

3.73–10.38

Graphene/Si

11*6

0.1–9

Difference in rotation angle

No

AND

XNOR

OR

27

OR

6.0–25.8

Silver

1*0.819

200–333

Difference in rotation angle

No

AND

NOR

NOT

This work

OR

22.38–65.66

Graphene/PTFE/gold

13.2*6.2

1–2.6

Difference in the Fermi level of resonators

Yes

XNOR

NAND

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