Magneto-optical properties of InSb for terahertz applications

Abstract

Magneto-optical permittivity tensor spectra of undoped InSb, n-doped and p-doped InSb crystals were determined using the terahertz time-domain spectroscopy (THz-TDS) and the Fourier transform far-infrared spectroscopy (far-FTIR). A Huge polar magneto-optical (MO) Kerr-effect (up to 20 degrees in rotation) and a simultaneous plasmonic behavior observed at low magnetic field (0.4 T) and room temperature are promising for terahertz nonreciprocal applications. We demonstrate the possibility of adjusting the the spectral rage with huge MO by increase in n-doping of InSb. Spectral response is modeled using generalized magneto-optical Drude-Lorentz theory, giving us precise values of free carrier mobility, density and effective mass consistent with electric Hall effect measurement.

Thermal spin photonics in the near-field of nonreciprocal media

“…We consider doped Indium Antimonide (InSb) slab which has been most widely studied in the context of coupled magneto-plasmon surface polaritons [41,42] and whose material permittivity dispersion has been wellcharacterized experimentally [43][44][45][46]. For the sake of completeness of our study, we extend the known permittivity model in [44][45][46] to the case of an arbitrarily oriented magnetic field in our geometry and obtain the semi-analytic form of permittivity given by e e w w w where m e =9.109 4×10 −31 kg is electron mass. Because of the antisymmetric (gyroelectric-type) permittivity tensor (e e = -T ) of InSb in presence of magnetic field, it is nonreciprocal and can lead to persistent features in its thermal near-field.…”

“…Γ denotes the optical phonon damping constant while γ is the free-carrier damping constant. All parameters are obtained from[45,46] for InSb sample of doping density n=10 17 cm −3 . e = ¥ 15.7, ω L =3.62×10 13 rad s -1 , w =3.39 10 T 13 rad s -1 , ω p =3.14×10 13 rad s -1 , G =5.65 10 11 rad s -1 , γ=3.39×10 12 rad s -1 ,…”

Plasmonic behavior of III-V semiconductors in far-infrared and terahertz range

“…These effects combined explain the differences in obtained values. For measurement with higher doping levels see [32]. …”

Quadratic magneto-optic Kerr effect spectroscopy of Fe epitaxial films on MgO(001) substrates

“…Our separation process of different QMOKE contributions is stemming from 8-directional method [10], but we use a combination of just 4 directions and a sample rotation by 45 • as will be described later in the text. This approach allows us to isolate QMOKE spectra that stem mostly from individual MO parameters and thus subsequently determine spectral dependencies of G s = G 11 − G 12 and 2G 44 , denoting MO parameters quadratic in M [17,[38][39][40]. Therefore, we start our study on FM bcc Fe thin films grown on MgO(001) substrates to get a basic understanding of QMOKE spectroscopy for further studies of AFMs.…”

“…In the dc spectral range we can mention the well known anomalous Hall effect [41], being linear in M , and anisotropic magnetoresistance (AMR) [42] together with the planar Hall effect, both being quadratic in M . Recently, in the terahertz region, an MO effect of free carriers, the so-called optical Hall effect [43], has also received much attention [44]. From the x-ray family there is the well known x-ray magnetic circular (linear) dichroism and birefringence, being linear (quadratic) in M [45,46].…”