Title :
THz Field Enhancement by Antenna Coupling to a Tapered Thick Slot Waveguide
Author :
Smith, Lee ; Ahmed, Foisal ; Jooshesh, Afshin ; Jinye Zhang ; Jun, Myung-Chul ; Darcie, Thomas
Author_Institution :
Fac. of Eng., Univ. of Victoria, Victoria, BC, Canada
Abstract :
We demonstrate experimentally the coupling of a THz beam into a laser-machined double-tapered thick slot waveguide operating between 0.3 and 2 THz. Simulation reveals that the THz field generated by a standard photoconductive antenna coupled to an undoped aspheric HRFZ-silicon focusing lens can be enhanced by 30 dB in the 40 μm taper waist, relative to a traditional Gaussian beam waist (at 1 THz). Analysis of the 8 dB insertion loss reveals positive implications for coupling between THz transceivers and in-plane-emitting antennas or low-loss THz waveguides.
Keywords :
aspherical optics; laser beam machining; laser materials processing; lenses; microwave photonics; optical couplers; optical focusing; optical losses; optical waveguides; photoconducting devices; photodetectors; silicon; terahertz wave generation; Gaussian beam waist; Si; frequency 0.3 THz to 2 THz; gain 30 dB; in-plane-emitting antennas; laser-machined double-tapered thick slot waveguide; loss 8 dB; low-loss terahertz waveguides; photoconductive antenna; size 40 mum; terahertz field enhancement; terahertz field generation; terahertz transceivers; undoped aspheric HRFZ-silicon focusing lens; Conductors; Couplings; Laser beams; Lenses; Optical waveguides; Principal component analysis; Waveguide lasers; Parallel plate waveguide; tapered waveguide; terahertz; terahertz field enhancement;
Journal_Title :
Lightwave Technology, Journal of
DOI :
10.1109/JLT.2014.2321992
