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Terahertz imaging through emissivity control
Michal Mrnka, Harry Penketh, Ian R. Hooper +5
Adoption of terahertz technologies is hindered by the lack of cost-effective THz sources. Here we demonstrate a fundamentally new way to generate and control THz radiation, via spa…
Space-squeezing optics in the microwave spectral region
Michal Mrnka, Euan Hendry, Jaroslav Láčík +4
Optical systems often consist largely of empty space, as diffraction effects that occur through free-space propagation can be crucial to their function. Contracting these voids off…
Spatiotemporal refraction of light in an epsilon-near-zero ITO layer
Justus Bohn, Ting Shan Luk, Euan Hendry
When light travels through a medium in which the refractive index is rapidly changing with time, the light will undergo a shift in its frequency. Large frequency shifting effects h…
Approximations used in the analysis of signals in pump-probe spectroscopy
Peter Karlsen, Euan Hendry
In pump-probe spectroscopy, one often needs to analyse the transmission or reflection of electromagnetic waves through optically pumped media. Here, it is common practice to approx…
Impact of pump wavelength on terahertz emission of a cavity-enhanced spintronic trilayer
Rosamund I. Herapath, Sam M. Hornett, T. Seifert +5
We systematically study the pump-wavelength dependence of terahertz pulse generation in thin-film spintronic THz emitters composed of a ferromagnetic Fe layer between adjacent nonm…
Subwavelength THz imaging of graphene photoconductivity
Samuel M. Hornett, Rayko I. Stantchev, Martha Z. Vardaki +2
Using a spatially structured, optical pump pulse with a THz probe pulse, we are able to determine spatial variations of the ultrafast THz photoconductivity with sub-wavelength reso…