Transmission characteristics of dichroic filters measured by THz time-domain spectroscopy

摘要: The transmission characteristics of perforated flat plates which act as dichroic filters or frequency selective surfaces were measured in the far-infrared (FIR) region by Terahertz Time-Domain Spectroscopy (THz-TDS). me- chanically made designed for cutoff frequencies 155, 586 ,a nd773 GHz. Due to their sharp cut- off characteristics, are used quasi-optical systems compact, high-pass throughout sub- millimeter wave and FIR region. Knowledge response such is important various applications mixing multiplying experiments microwave spectrum a freely propa- gating THz pulse with without filter was electro-optic sampling ZnTe crystal. experimental results dependence transmittance good agreement calculations based on theory given Chen (1).