Analysis of phase contrast imaging of terahertz phonon-polaritons

Slit waveguide based terahertz near-field microscopy: Prospects and limitations

“…26 The detection process is based on the electro-optic effect where the terahertz electric field induces a change in the refractive index at an optical probe wavelength. 27 Since the wavelength of the probe pulse is significantly shorter than the wavelength of the polariton field the terahertz wave form can be sampled with very high spatial resolution. 23 The forward wave vector components are phase-matched so that the probe pulse integrates over the induced refractive index change along the entire path through the crystal.…”

Spatiotemporal Visualization of THz Near-Fields in Metamaterial Arrays

“…The probe pulse is typically expanded so that it illuminates the entire sample region and experiences a local phase shift at those positions where it spatially overlaps with the THz field. The phase modulation is converted into an amplitude modulation through the Talbot effect while the probe pulse is transmitted onto a CCD camera for real-space imaging [21]. Since the wavelength of the probe pulse is significantly shorter than the wavelength of the THz electric field the waveforms can be sampled with very high spatial resolution.…”

Direct visualization of terahertz electromagnetic waves in classic experimental geometries

“…11 These techniques have been used to study terahertz generation, [12][13][14] and the interaction of terahertz waves with various structures. [15][16][17][18][19] Recent advancements in imaging [20][21][22] have made it possible to collect high resolution, in-focus videos of terahertz waves interacting with a variety of fabricated structures. These recent developments were incorporated in this study to make the images and videos as clear and understandable as possible.…”