ISSTT Proceedings

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Time-Domain Pulsed THz Near-Field Scanning Microscope with ~ λ/50 Resolution

Authors:
Oleg Mitrafanov, Mark Lee, John Federici
Abstract:
The technique of time gating single-cycle picosecond pulses is known to have several advantages over continuous wave (CW) methods in far-infrared spectroscopy. Because the short pulses have a very broad frequency content typically peaked around 1 THz, a large spectral range can be covered simultaneously with a single source. Also, because measurements are in the time domain, full phase information is maintained when performing a Fourier transform, something generally not done with CW methods. The absorption resonances many chemicals, dielectrics, and organic materials have in the THz frequency range make THz spectroscopy very useful. Unfortunately, with a free-space wavelength of order ~300 µm, diffraction-limited THz spectroscopy lacks the spatial resolution necessary to study the internal structure of electronic devices and biological cells. To do this requires resolution < 10 µm.
Categories:
Poster Session
Year:
2001
Session:
5
Full-text:
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Page Number(s):
182