Terahertz photonic circuits possible with active and passive components

https://www.laserfocusworld.com/optics/article/14287990/terahertz-photonic-circuits-possible-with-active-and-passive-components

"integrates terahertz photonics with planarized low-loss polymers—enabling signal propagation with passive elements and coherent source integration for broadband sensing and telecommunication... coherent comb sources, passive waveguides, reflectors, out-couplers, amplitude and phase control elements, and more... improving laser and frequency comb performance—it significantly improves dispersion, RF, and thermal properties... we’re hopefully not far from room temperature operation"

Related: Integrated photonic circuits could help close the 'terahertz gap'

https://techxplore.com/news/2023-01-photonic-circuits-terahertz-gap.html