Magneto-optical Kerr effect (MOKE) Spectrometer in Broad TeraHertz (THz) Frequency Range

Fig. 1: Top: Schematics of proposed sub-THz Martin-Puplett scanning interferometer for MOKE spectroscopy. Bottom: Prototype test bench in development.

Invention Summary:

Quantum magnetism effects are extensively sought for in contemporary materials research. Recent studies of magneto-optical polar Kerr effect (MOKE), in which rotation of polarization is detected with high precision for beam reflected from surface of a quantum material, have emerged as key experimental probe to identify time-reversal-symmetry-breaking. Gaining the insights to the underlying mechanisms leading to the novel properties requires precise MOKE spectroscopy at sub-THz frequencies, which is extremely challenging with only limited toolset available.

Rutgers researchers have developed a novel magneto-optical polar Kerr effect spectrometer with unprecedented sub-mrad angular accuracy at sub-THz frequencies and high spectral resolution (Fig. 1).

Market Applications:

  • Spectroscopy of quantum materials
  • Spectroscopy of chiral superconductors and anomalous Hall effect materials
  • Spontaneously induced magnetic moments in quantum materials including quantum magnets and unconventional superconductors


  • Unprecedented accuracy in complex Kerr angle measurements as a function of frequency in the sub-THz range

Intellectual Property & Development Status: Provisional patent application filed, patent pending. Available for licensing and/or research collaboration. For any business development and other collaborative partnerships contact



Patent Information:
Maricely Ramírez-Hernández
Licensing Manager
Rutgers, The State University of New Jersey