Open AccessNear-field THz imaging of free induction decay from a tyrosine crystal
Author(s) -
Akira Doi,
F. Blanchard,
Hideki Hirori,
Kōichiro Tanaka
Publication year - 2010
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.18.018419
Subject(s) - terahertz radiation , optics , free induction decay , microscope , image resolution , crystal (programming language) , terahertz spectroscopy and technology , electric field , resolution (logic) , signal (programming language) , materials science , microscopy , physics , medicine , spin echo , quantum mechanics , artificial intelligence , computer science , magnetic resonance imaging , radiology , programming language
We demonstrate images of free induction decay (FID) signals from a grain of tyrosine in the near-field of the THz frequency region. By combining electro-optic sampling with a charge-coupled-device (CCD) camera, our near-field THz microscope allows us to visualize the electric field blinking with the FID signal with spatial resolution of better than 70 microm. The oscillating frequency of the FID signal centered at approximately 1 THz corresponds to the vibrational mode of the tyrosine crystal. These results confirm that the THz near-field microscope can take spectroscopic images with subwavelength spatial resolution (approximately lambda/4).