Guidance of Terahertz Wave over Commercial Optical Fiber

This work proposes a new flexible terahertz subwavelength fiber using commercial optical fiber as the core medium. The proposed dual-band fiber allows the optical signals to propagate in the innermost two layers and the THz signal to distributed over the optical fiber and mostly in the lossless foam cladding. The propagation loss at 1550 nm and 500 μm are 0.2 dB/km and 0.034 dB/mm, respectively. The proposed fiber is compact and cost-effective, making it a promising candidate for optical and terahertz fusion sensing, imaging, and nonlinear optoelectronics applications.