Presentation Information
[16a-M_107-4]Theoretical Investigation on a Coupled Microcavity for Highly Efficient THz-DFG
〇Takahiro Kitada1, Mihiro Kameyama1 (1.NIT of Matsue)
Keywords:
coupled optical microcavity,difference frequency generation,terahertz source
Theoretical investigations were performed on a GaAs-based coupled optical microcavity composed of two cavity layers and three distributed Bragg reflectors (DBRs). Two cavity modes are realized in the center of the stop band, and its frequency difference can be tuned in the THz region. The difference frequency generation (DFG) of two modes was found to be enhanced by a factor of 10 when the sign inversion of the second-order nonlinear optical susceptibility is introduced in the middle of the structure. We also found that further enhancement of THz-DFG efficiency would be possible by an additional factor of 10 when THz reflector is placed on the backside to enable the multiple reflection of THz wave inside the structure.