LN prism to study Terahertz Optomagnetism: Nonlinear THz Excitation of GHz Spin Waves

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Featured research:
Terahertz Optomagnetism: Nonlinear THz Excitation of GHz Spin Waves in Antiferromagnetic FeBO3
E. A. Mashkovich, K. A. Grishunin, R. V. Mikhaylovskiy, A. K. Zvezdin, R. V. Pisarev, M. B. Strugatsky, P. C. M. Christianen, Th. Rasing, and A. V. Kimel
Phys. Rev. Lett. 123, 157202 – Published 11 October 2019

A nearly single cycle intense terahertz (THz) pulse with peak electric and magnetic fields of 0.5 MV/cm and 0.16 T, respectively, excites both modes of spin resonances in the weak antiferromagnet FeBO3. The high frequency quasiantiferromagnetic mode is excited resonantly and its amplitude scales linearly with the strength of the THz magnetic field, whereas the low frequency quasiferromagnetic mode is excited via a nonlinear mechanism that scales quadratically with the strength of the THz electric field and can be regarded as a THz inverse Cotton-Mouton effect. THz optomagnetism is shown to be more energy efficient than similar effects reported previously for the near-infrared spectral range.

We offer several MgO doped LiNbO3 prisms for THz generation using tilted wavefronts:
1. Aperture size 5x5 and 10x10
2. MgO - 0.6% and 1%
3. AR coating for all different wavelenght from 700nm to 1100 nm (800nm is one of the options).

Featured research:
My current research interests are in ultrafast phenomena in condensed matter, instrument development, nanofabrication and computer modeling. The work of my group is typified by experimental studies of materials and devices using femtosecond pump-probe techniques. In particular, we use a particular specialization of this method known as time domain terahertz (THz) spectroscopy. We have used this technique to study the dynamics of electrons, phonons and plasmons in semiconductor nanostructures and the propagation of light on microstructured metal-dielectric surfaces. We have also developed an ultrabroadband and polarization sensitive THz spectrometer and a fibre coupled THz near field microscope. Current or planned projects involve near THz field imaging of microstructured waveguides, establishing techniques to measure THz circular dichroism in biomaterials, the development of a cheap THz instrument for assessing drought stress in crops, THz electro-chemical sensing and femtosecond studies of graphene.