Temperature-controlled adjustable metamaterial terahertz demultiplexer design

Abstract This paper introduces a novel temperature-controlled terahertz metamaterial demultiplexer that capitalizes on the phase transition characteristics of vanadium dioxide (VO 2 ). The proposed demultiplexer is structured in three distinct layers: the top layer serves as a reflective layer, comprising a double-open resonance ring and a factory rectangular metal sheet; the middle layer is a polyimide dielectric isolation layer; and the bottom layer is a cross-shaped VO 2 temperature-controlled layer. This design enables the effective separation of four distinct terahertz frequency bands: 0.72 THz, 1.11 THz, 0.98 THz, and 1.26 THz. Notably, the demultiplexer achieves high isolation levels exceeding −20 dB across all target frequencies, while maintaining an insertion loss of less than 1 dB. The device also exhibits extremely low insertion loss and high isolation properties, which are crucial for terahertz communication applications. Therefore, the presented design holds significant potential for application and development in the realm of terahertz communication technology, offering a viable solution for frequency separation in upcoming high-speed and broadband communication systems.