Manipulating electromagnetic waves on graphene-based optical device with mixer application: equivalent circuit model approach

• Published in: Indian journal of physics Vol. 98; no. 5; pp. 1827 - 1832
• Main Authors: Khani, Amir Ali Mohammad, Rezaei, Ilghar, Soldoozy, Ali, Aghaee, Toktam
• Format: Journal Article
• Language: English
• Published: New Delhi Springer India 01.05.2024; Springer Nature B.V
• Subjects: Astrophysics and Astroparticles; Bias; Channels; Electromagnetic radiation; Equivalent circuits; Graphene; Impedance matching; Medical imaging; Original Paper; Physics; Physics and Astronomy; Terahertz frequencies; Optoelectronic device; Equivalent circuit model; Electromagnetic waves; Mixer application
• ISSN: 0973-1458; 0974-9845
• DOI: 10.1007/s12648-023-02942-2

In this paper, a simple structure benefits from biased graphene rings with a nonlinear THz wave mixer application. According to the impedance matching concept, the device impedance is set to minimize absorption while transmission and reflection channels can be considered as outputs. Exploiting both full wave approach and equivalent circuit model simulations results in two distinct sources involving 1–2 THz and 4–6 THz simultaneously while different biases result in multiple functionalities. Interestingly both output channels show some frequencies between 2 and 4 THz which are produced by the nonlinear intrinsic resonance of the device and intervention caused by two distinct source radiations. The presented structure can be considered as an adjustable device to manipulate THz waves regarding transmitting and reflection. Such a simple and sensitive structure to external bias stimulation is in great demand for medical imaging, security, indoor communication, and wave detection sensors.