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Sub-Wavelength THz ...
Abstract
Ämnesord
Stäng
- By focusing a femtosecond laser beam onto the lateral face of a periodically poled KTP crystal, we generate a THz pulse through optical rectification of the laser pulse. The THz signal is recorded by means of a common THz time-domain technique, which allows us to obtain both the magnitude and sign of the THz waveform, and then the magnitude and phase of its spectral components thanks to a numerical Fourier-transform. By moving the laser beam along the crystal, we record a THz signal that renders for the alternative orientation of the crystal domains, with a lateral resolution as good as 10 mu m, whatever the THz wavelength. This demonstrates the potential of the Optical Rectification TeraHertz Imaging (ORTI) technique to produce sub-wavelength THz images.
Ämnesord
- NATURVETENSKAP -- Fysik -- Atom- och molekylfysik och optik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Atom and Molecular Physics and Optics (hsv//eng)
Nyckelord
- Optical rectification
- Periodically poled crystals
- THz microscopy
- THz time-domain spectroscopy
- Crystal orientation
- Crystals
- Laser beams
- Crystal domain
- Lateral resolution
- Optical rectifications
- Periodically poled KTP
- Spectral components
- Terahertz imaging
- Time-domain technique
- Time domain analysis
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
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