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We developed a THz imaging system based on a broadband thermal source (at 500 °C) and an asymmetric semiconductor nanochannel, the self-switching nanodiode (SSD), as a room-temperature detector. The maximum resolution was better than 0.5 mm full width at half maximum. The radiation was coupled to the SSD through a microantenna, whose geometry determined the frequency bandwidth of the system. While...
Diffraction efficiencies of antireflective microstructures (AMSs) were calculated using a rigorous coupled wave analysis (RCWA) method for mid-infrared applications. The results show the effect of height, period, and shape of AMSs on the reflection. We also discuss optimum geometry of AMSs for mid-infrared application.
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