이중변조를 적용한 테라헬츠파 신호대 잡음비의 향상

초록

The interest of THz technology has been growing fast due to the potential of its vast applications. Today's THz technology pursues semiconductor based miniature electronic devices operating at undeveloped electromagnetic frequency band between 100 GHz and 10 THz. Tremendous research progresses on THz technology have been made for decades. However, it is limited in the power and performance of THz sources and systems for real applications. Recently, there are encouraging breakthrough in THz sources. THz technology has been extended its applications to imaging, warfare agent detection, medical diagnosis, material characterization. For these applications, THz-TDS (THz time-domain spectroscopy has been widely utilized [1]. In the characterizations of aqueous materials, absorptions of THz waves are enormous so that the difficulties of the weak THz wave detections are occurred. In this paper, to improve signal-to-noise ratios (SNR) in the THz wave detection, the double modulation technique has been applied.