Generation of terahertz wave by multiplying microwaves generated by optical beats

The use of terahertz waves in the boundary region between optical and radio waves is attracting attention. Although terahertz waves, which have frequencies ranging from 100 GHz to 10 THz, experience significant attenuation during atmospheric propagation, their high directionality makes them promising for applications such as sensing technology. In this study, we propose using a laser and optical fiber in the 1.5 μm band, which has low attenuation, to transmit laser light via the optical fiber and generate terahertz waves at the sensing location using the laser light. While there are methods to directly generate terahertz waves from laser light, this study proposes using established microwave photonics technology to generate microwaves from laser light and then amplify the generated microwaves to produce terahertz waves.