Rosamund Herapath presents at TERANET UK-THz Symposium

On 4th and 5th December 2019, fourth year PGR Rosamund HerapathDr. Lauren Barr (alumna of the CDT) and Prof. Euan Hendry went to National Physical Laboratory (NPL) for the ‘TERANET UK-THz Symposium’.

The event included 23 speakers from around the UK to discuss recent advances made in the field of mm-wave and THz research, alongside updates from ongoing collaborations and larger scale THz projects. There was also a poster session and evening meal. Topics included: THz imaging, photomodulators, THz metamaterials and others.

Rosamund at Teranet Dec 2019
Dr. Lauren Barr at Teranet Dec 2019

Rosamund presented her work ‘Terahertz Emission from a Cavity- enhanced Spintronic Trilayer’.
Lauren presented ‘Using geometry to improve modulation for single-pixel THz imaging’.
Euan presented a keynote talk ‘Computational mm-wave and THz imaging’.

Teranet UK is an EPSRC network for THz science and technology research in the UK, and encourages collaborations and communication across UK THz groups at Universities and other facilities to take advantage of the high number of THz groups in the UK.

Prof. Euan Hendry at Teranet Dec 2019

Impact of pump wavelength on terahertz emission of a cavity-enhanced spintronic trilayer


FIG. 1.
Schematic of a spintronic trilayer with added dielectric cavity, grown on 0.5 mm of sapphire (Al2O3). The near-infrared pump pulse, incident through the substrate, is partially absorbed in the metallic layers, launching a spin current from the ferromagnetic (FM) layer into the nonmagnetic (NM) layers. The inverse spin Hall effect converts this ultrashort out-of-plane spin current into an in-plane charge current resulting in the emission of THz radiation into the optical far-field. A weak in-plane magnetic field (B) determines the magnetization direction and the linear polarization of the emitted THz field.

Congratulations to third year CDT PGR Rosamund Herapath for her recent publication of Impact of pump wavelength on terahertz emission of a cavity-enhanced spintronic trilayer in Applied Physics Letters.

In this paper, the authors enhance the THz generation of a novel, thin-film THz emitter by adding a set of dielectric overlayers. In doing so, they not only increase the intensity of the THz emitter by a factor of 4 in intensity, but also reduces the amount of IR pump beam transmitted (This will enable the emitter to be used within delicate systems).

She presented her findings in December 2018 at University of Warwick.