Terahertz near-field spectroscopy of filled subwavelength sized apertures in thin metal films.

@article{Knab2013TerahertzNS,
  title={Terahertz near-field spectroscopy of filled subwavelength sized apertures in thin metal films.},
  author={Joseph R. Knab and Aur{\`e}le J. L. Adam and E. A. Shaner and H J A J Starmans and Paul C. M. Planken},
  journal={Optics express},
  year={2013},
  volume={21 1},
  pages={1101-12}
}
We have measured terahertz near-field spectra of cesium iodide crystals as small as ~10 μm in diameter, which were deposited on single, sub-wavelength-sized apertures created in thin gold films on a substrate. The advantage of using small apertures for terahertz microspectroscopy is that only terahertz light that has interacted with the cesium iodide is observed. We find that around the transverse optical phonon frequency of cesium iodide, the amplitude transmission is as much influenced by the… CONTINUE READING