Abstract
A new integrated lens-antenna is designed and implemented for a nanocontact based terahertz (THz) photomixer. The new design replaces the standard conventional bulky silicon lens, which normally no THz photomixer can avoid. The Fresnel Zone Plate is used to design the new lens-antenna and is simulated by the MIT open-source tool called Meep. The final design showed, with only two simple fabrication technology processing steps (standard optical lithography) that the lens-antenna can be monolithically integrated with the THz nanophotomixer. With its compact design, the THz measurements showed a comparable behavior to the conventional bulky silicon lens, therefore it would be ready for photonic integrated circuits based THz systems.
Highlights
Available based THz systems have already demonstrated great potential in terms of high tunability, standard room temperature operation, and signal quality, they are still suffering from many drawbacks, such as big size equipment, mechanical disturbance, high power consumption, and low flexibility system[2]
Nanocontact photomixers were already reported in[5] to overcome the failure mechanisms of the conventional photomixer. It shows a large reduction of the capacitance and increase of the photocurrent as compared to conventional photomixers
A Fresnel zone plate has been chosen to be integrated with the photomixer due to its planar structure and directivity characteristics
Summary
A new integrated lens-antenna is designed and implemented for a nanocontact based terahertz (THz) photomixer. The new design replaces the standard conventional bulky silicon lens, which normally no THz photomixer can avoid. This will be described in detail in the 2D Simulation section. The design and implementation of the integrated lens-antenna will be described and compared with the typically used Si-lens
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