Proposal for THz generation by an unbiased and antenna-coupled CW terahertz photomixer

We introduce an array of new antenna-coupled and unbiased terahertz photomixer. Unlike previous structures, this emitter does not require any external bias voltage. In this work, we show that an array of asymmetric (bi-metallic) MSM structures, whose unit cell (pitch) is made of a pair of dissimilar Schottky contacts on LTG-GaAs can act as bias free CW THz photomixer emitters. For photocarrier acceleration it rather makes use of the built-in electrostatic Schottky contact field formed at the electrode-photoconductor interface. Moreover, we demonstrate 5 μW of THz power radiation in the 0.5 THz can be achieved by using a dipole antenna integrated with the proposed unbiased photomixer. A hybrid numerical simulation method is used to model and analyze this phenomenon.