Theoretical demonstration of highly efficient cw THz generation by using composite photonic-structure elements

A. Oyamada; H. Kitaguchi; K. Ebata; H. Ishihara

doi:10.2971/jeos.2013.13023

Journal of the European Optical Society - Rapid publications, Vol 8 (2013)

Theoretical demonstration of highly efficient cw THz generation by using composite photonic-structure elements

A. Oyamada, H. Kitaguchi, K. Ebata, H. Ishihara

Abstract

We theoretically propose one-dimensional composite photonic structures for high-resolution THz spectroanalysis. We compare the performance of two GaAs/AlAs composite photonic-structure devices, one with usual 1/4-wavelength layers of distributed Bragg reflectors (DBRs), and the other with the designed DBRs. The device with designed DBRs shows the optical-to-terahertz conversion efficiency up to 10^-5 and wide frequency tunability ranging from sub-THz to 3 THz. We found that the composite photonic structure allows us to control photonic modes with a high degree of freedom by flexible structure designs. This device achieve a cw THz source with a highly narrow bandwidth operating at room temperature.

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