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A novel terahertz (THz) top hat loaded photomixer antenna is proposed in order to enhance the output power. This device consists of trapezoidal nano-electrodes in the photomixer part and a full wavelength dipole loaded with planar hat loads in the antenna part. Considering the effect of the new photomixer configuration on the antenna source resistance, a new top hat loaded antenna with high input...
Terahertz (THz) antennas based upon photoconduction techniques in THz pulsed and continuous-wave (CW) systems are introduced and compared. It is addressed that the differences in the excitation of these antennas lead to different design requirements. In both antenna types, optical-to-electrical conversion efficiency is very low - this means that employing techniques which can enhance the generated...
The main parameters of terahertz (THz) photoconductive (PC) antennas, when employed as emitters in THz pulsed systems, have been reviewed and discussed with the emphasis on the THz output power and optical-THz conversion efficiency. The discussion is supported by the results from many published papers and the conclusion is drawn on a simplified block diagram which shows the role of each parameter...
Photoconductive antennas have been widely used to generate and detect THz waves in recent years. Because the thickness of the substrate is usually larger than the wavelength of THz waves, surface/substrate modes may be generated and the effect of the substrate cannot be ignored - this has not been properly investigated. This paper is therefore to investigate this problem using a numerical simulation...
Terahertz (THz) wave has attracted a lot of attention in recent years because of its huge potential applications. The most widely used structure for THz generation and detection is photoconductive dipole antenna which has an omni-directional radiation pattern, so how to generate THz wave efficiently in a desired direction is still a problem to be resolved. This paper introduces a new type of photoconductive...
The terahertz (THz) band is generally referred to as the electromagnetic spectrum between 0.1 and 10 THz. Because of its attractive features such as chemical specificity, penetration capability, non-ionisation, and wide bandwidth, this least explored frequency band has become the focus of many researchers. Currently the photoconductive antenna is widely used to generate THz waves. However, the THz...
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