Layered Graphene Transmission Line as a Tunable Band Stop Filter and Amplitude Modulator at Terahertz Frequencies

Document Type : Research Paper

Author

Faculty of Technical and Engineering, Imam Khomeini International University, Qazvin, Iran.

10.22075/mseee.2025.37048.1202

Abstract

In this paper, the effects of loading the substrate of a series of graphene transmission lines, in a terahertz frequency band, by longitudinal graphene strips, are investigated and numerically simulated. Two applications of a tunable band-stop filter and amplitude modulator are designed. At first, a single graphene strip is inserted in the substrate of a series transmission. It is shown that by changing the chemical potential of the inserted graphene strip, in the range of 0-0.6 eV with step of 0.2 eV, a tunable band-stop filter which supports four cases of all-pass response and 10-dB rejection bands of 1.77-2.55 THz (36.1%), 2.55-3.47 THz (30.5%) and 3.13-4.1 THz (26.8%) in the frequency range of 1-5 THz is obtained. Then, to generalize the structure to obtain more flexibility and cover a wider range of applications, three parallel longitudinal strips are placed in the substrate, and the transmission response with varying chemical potential of all the graphene strips is calculated. It is observed that, with changing chemical potential of graphene elements in the range 0-1.4 eV, a tunable band-stop filter with lower bandwidths of 1.94-2.49THz (24.8%), 3.52-3.68THz (4.4%), 4.25-4.82THz (12.56%), which is applicable for high quality systems, as well as an amplitude modulator with more than 10 cases of modulation depths ranging from 0 to 100%, in the frequency range of 3.4-3.8 THz, and with optimum performance at the frequency of 3.6 THz, are obtained.

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Main Subjects


[1]
J.-S. Gómez-Díaz and J. Perruisseau-Carrier, "Graphene-based plasmonic switches at near infrared frequencies," Optics Express, vol. 21, no. 13, pp. 15490-15504, 2013.
[2]
I. Al-Naib, "Biomedical sensing with conductively coupled terahertz metamaterial resonators," IEEE Journal of Selected Topics in Quantum Electronics, vol. 23, no. 4, pp. 1-5, 2016.
[3]
P. Zamzam, P. Rezaei, S. A. Khatami and Z. Mousavirazi, "Convertible Perfect Absorber with Single Ring Resonator: Tunable Single Band/Dual-Band Visible," Modeling and Simulation in Electrical and Electronics Engineering, vol. 1, no. 4, pp. 7-13, 2022.
[4]
M. Ghaderi and P. Rezaei, "Wide Band THz Transmitarray Antenna Based on Graphene Slotted Lattice," Modeling and Simulation in Electrical and Electronics Engineering, pp. 1-8, 2025.
[5]
M. PourHosseini, S. Jarchi, P. Rezaei, and Z. Ghattan Kashani, "High gain multi-band circularly polarized bi-layered metasurface patch array antenna with dual-orthogonal feeds," Optical and Quantum Electronics, vol. 57, no. 2, p. 155, 2025.
[6]
M. PourHosseini, S. Jarchi, P. Rezaei, and Z. Ghattan Kashani, "Terahertz microstrip array antenna with metasurface polarization conversion using silicon dioxide as dielectric layer," Optical and Quantum Electronics, vol. 56, no. 5, p. 796, 2024.
[7]
Q. Zheng, L. Xia, L. Tang, C. Du and H. Cui, "Low voltage graphene-based amplitude modulator for high efficiency terahertz modulation," Nanomaterials, vol. 10, no. 3, p. 585, 2020.
[8]
Y. Yao, X. Cheng, S.-W. Qu, J. Yu and X. Chen, "Graphene-metal based tunable band-pass filters in the terahertz band," IET Microwaves, Antennas & Propagation, vol. 10, no. 14, pp. 1570-1575, 2016.
[9]
A. Shubham, D. Samantaray, S. K. Ghosh, S. Dwivedi, and S. Bhattacharyya, "Performance Improvement of a Graphene Patch Antenna using Metasurface for THz Applications," Optik, vol. 264, p. 169412, 2022.
[10]
S. Armaghani, S. Khani and M. Danaie, "Design of all-optical graphene switches based on a Mach-Zehnder interferometer employing optical Kerr effect," Superlattices and Microstructures, vol. 135, p. 106244, 2019.
[11]
M. Yaghobi, R. Rezaei and M. M. Fakharian, "Graphene-Based Planar Microstrip Patch Antenna with Circular Polarization Capability," Modeling and Simulation in Electrical and Electronics Engineering, vol. 1, no. 3, pp. 41-45, 2021.
[12]
C. Casiraghi, A. Hartschuh, E. Lidorikis, H. Qian, H. Harutyunyan, T. Gokus, K. S. Novoselov and A. C. Ferrari, "Rayleigh imaging of graphene and graphene layers," Nano letters, vol. 7, no. 9, pp. 2711-2717, 2007.
[13]
A. Adetayo and D. Runsewe, "Synthesis and fabrication of graphene and graphene oxide: a review," Open Journal of Composite Materials, vol. 9, no. 02, p. 207, 2019.
[14]
D. Correas-Serrano, J. S. Gomez-Diaz, J. Perruisseau-Carrier, and A. Alvarez-Melcon, "Graphene-based plasmonic tunable low-pass filters in the terahertz band," IEEE Transactions on Nanotechnology, vol. 13, no. 6, pp. 1145-1153, 2014.
[15]
H. Deng, Y. Yan, and Y. Xu, "Tunable flat-top bandpass filter based on coupled resonators on a graphene sheet," IEEE Photonics Technology Letters, vol. 27, no. 11, pp. 1161-1164, 2015.
[16]
R. Emadi, A. Amirhosseini, M. Karimi, R. Safian, and A. Z. Nezhad, "Design of low-loss waveguide switch using graphene strips at THz frequencies," in 2016 Fourth International Conference on Millimeter-Wave and Terahertz Technologies (MMWaTT), 2016.
[17]
Y. Zhang, Y. Feng, B. Zhu, J. Zhao, and T. Jiang, "Graphene-based tunable metamaterial absorber and polarization modulation in terahertz frequency," Optics Express, vol. 22, no. 19, p. 2274322752, 2014.
[18]
N. Kakenov, M. S. Ergoktas, O. Balci, and C. Kocabas, "Graphene-based terahertz phase modulators," 2D Materials, vol. 5, no. 3, p. 035018, 2018.
[19]
Y. Feng, Y. Liu, X. Wang, D. Dong, Y. Shi and L. Tang, "Tunable multichannel plasmonic filter based on a single graphene sheet on a Fibonacci quasiperiodic structure," Plasmonics, vol. 13, no. 2, pp. 653-659, 2018.
[20]
E. Shokati, S. Asgari and N. Granpayeh, "Dual-band polarization-sensitive graphene chiral metasurface and its application as a refractive index sensor," IEEE Sensors Journal, vol. 19, no. 21, pp. 9991-9996, 2019.
[21]
N. Kiani, F. T. Hamedani and P. Rezaei, "Designing of a circularly polarized reconfigurable graphene-based THz patch antenna with cross-shaped slot," Optical and Quantum Electronics, vol. 55, no. 4, p. 356, 2023.
[22]
B. Khodadadi, P. Rezaei and S. Hadipour, "Accurate graphene-based absorber for slight leakage detection of Radon and chloroform air-pollution," Results in Physics, vol. 71, p. 108196, 2025.
[23]
S. E. Hosseininejad, K. Rouhi, F. Wang, M. Khalily and R. Tafazolli, "High-speed terahertz communication with graphene-based time-modulated low-bit phase coding metasurfaces: A novel architecture for enhanced performance," Materials Today Communications, vol. 40, p. 109726, 2024.
[24]
I. Marasco, C. Cantore, G. V. Bianco, G. Bruno, A. D’orazio, and G. Magno, "Transparent Graphene-Based RIS for 6G Communications in the THz Spectrum," IEEE Open Journal of Antennas and Propagation, 2024.
[25]
J. Muheki, J. Wekalao, H. B. Albargi, M. Jalalah, A. H. Almawgani, and S. K. Patel, "A graphene gold metasurface inspired surface plasmon resonance sensor designed for terahertz applications in sensing and detection of heavy metals in water," Plasmonics, vol. 20, no. 1, pp. 289-303, 2025.
[26]
S. Khani, "Compact and Tunable Microstrip Bandpass Filter Using a Disk Resonator and a U-shaped Waveguide for Wi-MAX and WLAN Applications," Modeling and Simulation in Electrical and Electronics Engineering, vol. 3, no. 2, pp. 29-35, 2023.
[27]
A. Parsa, P. Rezaei, A. Amne Elahi, and Z. Mousavirazi, "High-Efficiency Slot Array Antenna Fed by a Microstrip Line to ESIW Transition for X-band Applications," Modeling and Simulation in Electrical and Electronics Engineering, vol. 3, no. 1, pp. 47-52, 2023.
[28]
S. Jarchi, "Amplitude Modulator Design Using Series Graphene Transmission Lines in Terahertz Frequency Band," IEEE Transactions on Nanotechnology, vol. 23, pp. 323-328, 2024.
[29]
M. Mokhayer, S. Jarchi and R. Faraji-Dana, "Multifunctional reconfigurable metasurfaces for manipulation of transmitted wave in THz Band," Optical and Quantum Electronics, vol. 56, no. 6, p. 1038, 2024.
[30]
M. Mokhayer, S. Jarchi and R. Faraji-Dana, "Miniaturized meandered ring graphene-metal metasurface with wide angle control on the transmitted wave," AEU-International Journal of Electronics and Communications, vol. 187, p. 155566, 2024.