Millimeter Wave Characterization of a Catadioptric Lens for Imaging Applications

B. Banik, J. Vukusic, J. Stake
2009 IEEE Microwave and Wireless Components Letters  
Cover: THz imaging of a partially dead leaf employing a catadioptric lens coupled WR-10 horn antenna in a transmission-mode CW imaging setup at 108 GHz. Abstract This thesis deals with the analysis and optimisation of the uni-travelling-carrier photodiode (UTC-PD) for continuous-wave generation in terahertz (THz) frequency range. Photonic THz generation using UTC-PDs is extremely promising as it offers wide tunability, adequate output power and room temperature operation. Furthermore, a novel
more » ... d compact catadioptric lens is proposed and investigated for realising compact sensing systems. Radiating elements and components can be physically coupled to the lens in order to achieve short-range focusing and sensing ability. Using physical device modelling, the limitations and optimisation of InGaAs/InP based UTC-PDs for attaining higher bandwidth as well as higher output power are discussed. A hydrodynamic (HD) carrier transport model is used to analyse the device. Optimising for output power requires trade-offs involving the epitaxial layer design, optical coupling, circuit design and antenna design. An example of UTC-PD epitaxial layer optimisation for continuous-wave THz generation at 340 GHz is shown using the HD model. The output power and the optimum embedding impedance for the UTC-PD, as a function of device parameters, are also studied at different optical injection levels. Several plausible integration schemes and antenna design examples at 340 GHz are explored. A novel catadioptric lens, suitable for microwave and terahertz applications, is presented. The focusing property of the lens is investigated using 3D full-wave electromagnetic solvers. The proposed catadioptric lens is designed and fabricated from Delrin and Macor. Simulation and characterisation results are presented at microwave and terahertz frequencies (108 GHz). The results show that although being a few wavelengths (λ) in dimension, the catadioptric lens provides short-range focusing in the close vicinity (~λ) and therefore provides a compact solution for short-range imaging systems. Finally, several short-range imaging examples at 108 GHz, employing the catadioptric lenses, are also presented and discussed. Keywords: III-V semiconductors, catadioptric lens, dielectric loaded antennas, lens antennas, microwave imaging, millimetre wave and submillimetre wave generation, millimetre wave and submillimetre wave imaging, nondestructive evaluation, photomixers, semiconductor device modelling, uni-travelling-carrier photodiodes, terahertz imaging, terahertz sources. iv v List of appended papers The thesis is based on the following papers:
doi:10.1109/lmwc.2009.2031997 fatcat:ap3bwujcyngjdgqkzovb5ajav4