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The recent development of the terahertz waveguide makes it an excellentplatform for integrating many intriguing functionalities, which offerstremendous potential to build compact and robust terahertz systems. In thecontext of next-generation high-speed communication links at the terahertzband, engineering the dispersion and birefringence of terahertz waves isessential. Here, we experimentally demonstrate subwavelength birefringentwaveguide gratings based on the low-loss cyclic olefin copolymer exploitingmicro-machining fabrication techniques. Asymmetric cross-section andperiodic-structural modulation along propagation direction are introduced toachieve birefringent THz grating for filtering and dispersion compensation.Because of strong index modulation in the subwavelength fiber, a high negativegroup velocity dispersion of -188 (-88) ps/mm/THz is achieved at 0.15 THz forx-polarization (y-polarization), i.e., 7.5 times increase compared to thestate-of-the-art reported to date. Such high negative dispersion is realized ina 43 mm grating length, which is less than half of the length reported untilnow (e.g., 100 mm). Further, the subwavelength fiber grating filters twoorthogonal polarization states and exhibits transmission dips with 8.5-dB and7.5-dB extinction ratios for x and y polarization, respectively. Our experimentdemonstrates the feasibility of using polymer-based terahertz gratings as adispersion compensator in terahertz communications and steering polarizedterahertz radiations for polarization-sensitive THz systems.

Terahertz birefringent gratings for filtering and dispersion compensation