Fig. 1. Cross sectional structure of proposed THz-PCF. (a) Cladding region; (b) core region

Fig. 2. Birefringence of proposed THz-PCF changing with frequency when independent structural parameters are changed by control variable method. (a) Different r₁; (b) different r₂; (c) different d₁; (d) different d₂; (e) different d₃; (f) different l; (g) different R; (h) different Λ

Fig. 3. Birefringence and effective refractive index of proposed THz-PCF changing with frequency in the frequency range of 2-6 THz

Fig. 4. Confinement loss for proposed THz-PCF changing with frequency in the frequency range of 2-6 THz

Fig. 5. Effective absorption loss for proposed THz-PCF changing with frequency in the frequency range of 2-6 THz

Fig. 6. Bending loss of optical fiber bent along x and y directions respectively at the operating frequency of 4 THz changing with bending radius, and the illustrations show mode field distribution of TM mode with bending radius is (a) 1 cm, (b) 2 cm, and (c) 3 cm

Fig. 7. Power fraction in air and material for proposed THz-PCF changing with frequency in the frequency range of 2-6 THz

Fig. 8. Waveguide dispersion for proposed THz-PCF changing with frequency in the frequency range of 2-6 THz

Fig. 9. Relationship between PMD and frequency

Fig. 10. Mode field distribution of x-polarization and y-polarization under different frequencies. (a) TE, f=1.5 THz; (b) TE, f=2 THz; (c) TE, f=3 THz; (d) TE,f=4 THz; (e) TM, f=1.5 THz; (f) TM, f=2 THz; (g) TM, f=3 THz; (h) TM, f=4 THz