Abstract
A scheme for monochromatic terahertz (THz) generation via cascading
enhanced Cherenkov-type difference frequency generation (DFG) in a sandwich-like
waveguide is proposed. The novel scheme has the potential to overcome the
quantum-defect limit and to provide an efficient output coupling. This process
is elucidated by developing a coupled-mode theory and taking into account
the pump depletion, waveguide mode properties, and THz output coupling. The
effect of cascading enhancement is analyzed by comparing with non-cascaded
DFG situation. It is predicted that THz power can be boosted by nearly 8-fold
with a 400 MW/cm2 pump in a 40-mm-long Si-LiNbO3-Si waveguide.
© 2013 IEEE
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