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Phase-shifted Fresnel zone lenses for photomixing generation of coherent THz wave
Date Issued
01-07-2012
Author(s)
Vijayakumar, Anand
Uemukai, Masahiro
Suhara, Toshiaki
Abstract
Novel optics configurations simplified by using phase-shifted Fresnel zone lenses (FZLs) are proposed for THz wave generation by mixing optical beams from integrated twin lasers on GaAs photomixers. The phase-shifted FZL superimposes and collinearly collimates the beams from the closely-aligned twin lasers, or superimposes and focuses them directly onto a photomixer, with a high efficiency. Phase-shifted binary and analog FZLs were designed and fabricated by electron beam writing. Good performances close to the theoretical prediction were obtained, and THz wave generation was successfully demonstrated.© 2012 The JPN Society of Applied Physics.
Volume
51