Publications [#357719] of Michael E. Gehm

Papers Published

1. Zhang, J; Ng, WR; Tuo, M; Liang, M; Golish, DR; Gehm, ME; Xin, H, Theoretical and experimental study of a terahertz time-domain spectrometer based on photoconductive antenna, 2014 United States National Committee of URSI National Radio Science Meeting, USNC-URSI NRSM 2014 (October, 2014), ISBN 9781479931200 [doi]
   (last updated on 2024/12/31)

   Abstract:
   We construct a terahertz time-domain spectrometer (THz-TDS) system based on photoconductive antenna (PCA). A 800 nm Ti:sapphire femtosecond laser with 80 MHz repetition rate provides the pump and probe laser pulse, which has a 45 fs pulse width (as short as 15 fs is available) and as much as 400 mW power. Two commercial PCAs with 34 um and 6 um gap size are used as the emitter and receiver, respectively. We characterize this system by measuring its absolute radiated THz power, spectral bandwidth, signal-to-noise ratio (SNR) and dynamic range. Using this system, we study the response of the PCA as the emitter and receiver to the laser power and/or biased DC voltage, as well as their influences on the SNR and dynamic range of the TDS system.