Title :
A Novel Sub-THz Photomixer With Nano-Trapezoidal Electrodes
Author :
Khiabani, N. ; Yi Huang ; Garcia-Munoz, Luis Enrique ; Yao-chun Shen ; Rivera-Lavado, Alejandro
Author_Institution :
Dept. of Electr. Eng. & Electron., Univ. of Liverpool, Liverpool, UK
Abstract :
A new sub-terahertz (THz) photomixer with nano-trapezoidal fingers is analyzed, designed, fabricated, and measured. The results are compared with conventional THz photomixers without fingers (or bare gap) and with rectangular fingers. The new design is employed as an emitter as well as a detector and much improved THz power and signal-to-noise ratio (SNR) are obtained. As compared to the antenna with the bare gap and the antenna with rectangular finger tips under the same condition for the optical power and bias voltage, the new photomixer shows seven and two times power enhancement in the emission side, respectively, while in the detection side, it gives a better SNR of 15 and 10 dB, respectively.
Keywords :
photoconducting devices; terahertz wave devices; THz power; bare gap; bias voltage; detection side; emission side; nanotrapezoidal electrodes; nanotrapezoidal fingers; optical power; power enhancement; rectangular finger tips; rectangular fingers; signal-to-noise ratio; sub-THz photomixer; sub-terahertz photomixer; Antenna measurements; Antennas; Capacitance; Detectors; Electrodes; Geometry; Substrates; Nano-trapezoidal fingers; THz detection; THz emission; THz photomixer;
Journal_Title :
Terahertz Science and Technology, IEEE Transactions on
DOI :
10.1109/TTHZ.2014.2320824
