Lying between the microwave and infrared frequencies,the electromagnetic spectrum band,normally defined as^0.1 THz to 10.0 THz,was often referred to as a'terahertz(THz)gap'due to the difficulties in efficiently generating,manipulating,and detecting THz radiation.However,driven by the promising applications ranging from non-destructive imaging,spectroscopic sensing,to ultra-high bit rate wireless communications,continuous efforts have been devoted to
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