Imaging with terahertz electromagnetic pulses

테라헤르츠 전자기파 펄스의 변조를 이용한 이미징의 해상도 연구

  • 오승재 (서울시립대학교 물리학과) ;
  • 강철 (서울시립대학교 물리학과) ;
  • 손주혁 (서울시립대학교 물리학과)
  • Published : 2004.02.01


Images were acquired by the modulation of terahertz electromagnetic signals and compared by modulation frequencies. For the real-time acquisition of images a fast scanning method has been adopted utilizing a galvanometer. The acquired time domain waveforms were transformed into frequency domain data by fast Fourier transformations (FFT). We chose some frequency components to compare the resolution of images. The beam profiles at the focal position were measured by a knife-edge technique. Beam diameter was shown to decrease as the frequency increased. By scanning one- and two-dimensional samples a significant image enhancement was observed with the frequency increment. A nondesouctive imaging system using ㎔ electromagnetic pulses was also demonstrated.


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