Modifying the polarization state of terahertz radiation using anisotropic twin-domains in LaAlO_3

Lloyd‐Hughes, James; Jones, S. P. P.; Castro-Camus, E.; Doig, K. I.; MacManus‐Driscoll, Judith L.

doi:10.1364/ol.39.001121

Cited by 16 publications

(20 citation statements)

References 22 publications

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“…(1). The refractive indices of the LISe crystal exhibit orientation dependence, which was also observed from the polarization-resolved THz time-domain spectroscopy of LaAlO 3 [16]. The values of n Y and n Z are very close, which indicates that the refractive index ellipsoid in bcut principle plane is close to circular.…”

Section: Resultssupporting

confidence: 63%

Optical properties of LiInSe_2 in the THz frequency regime

Liang

Wang

Tao

et al. 2014

Opt. Mater. Express

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We investigate the optical properties of LiInSe 2 (LISe) by THz time-domain spectroscopy (THz-TDS). The experimental results indicate that LISe has excellent transparency in the THz frequency region. We determine quantitatively the birefringence of LISe. The refractive index and absorption coefficient along the three dielectric axes of LISe are reported in the THz frequency region. The lattice vibrations of LISe are analyzed on the basis of the THz-TDS measurement in combination with infrared and Raman spectra. The origin of the low-frequency vibrational modes below 3 THz as interatomic bond-bending modes is revealed.

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Section: Resultssupporting

confidence: 63%

Optical properties of LiInSe_2 in the THz frequency regime

Liang

Wang

Tao

et al. 2014

Opt. Mater. Express

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“…A wire grid polariser was placed after the THz emitter. THz pulses were focused on samples placed in a superconducting magnet in the Faraday geometry, where = -B 0.0 7.5 T was applied along the growth axis in 0.1 T steps, and at T=3 K. To investigate the longitudinal and transverse response of HHs to an ac electric field, the orthogonal components of the THz radiation were probed using electro-optic sampling with a 〈111〉-oriented ZnTe crystal [17,18]. This directly yields the complex transverse conductivity .…”

Section: Experimental Methodsmentioning

confidence: 99%

Terahertz quantum Hall effect for spin-split heavy-hole gases in strained Ge quantum wells

et al. 2016

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Spin-split heavy-hole gases in strained germanium quantum wells were characterized by polarisationresolved terahertz time-domain spectroscopy. Effective masses, carrier densities, g-factors, transport lifetimes, mobilities and Rashba spin-splitting energies were evaluated, giving quantitative insights into the influence of strain. The Rashba coefficient was found to lower for samples with higher biaxial compressive strain, while heavy-hole mobilities were enhanced to over1.5 10 6 cm 2 V −1 s −1 at 3 K. This high mobility enabled the observation of the optical quantum Hall effect at terahertz frequencies for spin-split two-dimensional heavy-holes, evidenced as plateaux in the transverse magnetoconductivity at even and odd filling factors.

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“…5(a), and is flat and featureless for the PTFO-100 and PTFO-200 samples in the range below 10 meV. Above 10 meV all samples exhibit a sharp rise in transmission, an artifact which arises from the LaAlO 3 substrate, which acts as a half wave plate at these frequencies40. The response for the PTFO-300 film displays a prominent reduction in transmission around 9 meV in Fig.…”

Section: Resultsmentioning

confidence: 93%

“…Data were averaged over four possible orientations of the PTFO samples and a blank substrate (VV, VH, HV, HH, where H/V represent horizontal or vertical orientation of the sample and substrate respectively). This removes the influence of substrate anisotropy40.…”

Section: Methodsmentioning

confidence: 99%

Structural, optical and vibrational properties of self-assembled Pbn+1(Ti1−xFex)nO3n+1−δ Ruddlesden-Popper superstructures

Doig

Peters

Nawaz

et al. 2015

Sci Rep

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Bulk crystals and thin films of PbTi1−xFexO3−δ (PTFO) are multiferroic, exhibiting ferroelectricity and ferromagnetism at room temperature. Here we report that the Ruddlesden-Popper phase Pbn+1(Ti1−xFex)nO3n+1−δ forms spontaneously during pulsed laser deposition of PTFO on LaAlO3 substrates. High-resolution transmission electron microscopy, x-ray diffraction and x-ray photoemission spectroscopy were utilised to perform a structural and compositional analysis, demonstrating that and . The complex dielectric function of the films was determined from far-infrared to ultraviolet energies using a combination of terahertz time-domain spectroscopy, Fourier transform spectroscopy, and spectroscopic ellipsometry. The simultaneous Raman and infrared activity of phonon modes and the observation of second harmonic generation establishes a non-centrosymmetric point group for Pbn+1(Ti0.5Fe0.5)nO3n+1−δ, a prerequisite for (but not proof of) ferroelectricity. No evidence of macroscopic ferromagnetism was found in SQUID magnetometry. The ultrafast optical response exhibited coherent magnon oscillations compatible with local magnetic order, and additionally was used to study photocarrier cooling on picosecond timescales. An optical gap smaller than that of BiFeO3 and long photocarrier lifetimes may make this system interesting as a ferroelectric photovoltaic.

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Modifying the polarization state of terahertz radiation using anisotropic twin-domains in LaAlO_3

Cited by 16 publications

References 22 publications

Optical properties of LiInSe_2 in the THz frequency regime

Optical properties of LiInSe_2 in the THz frequency regime

Terahertz quantum Hall effect for spin-split heavy-hole gases in strained Ge quantum wells

Structural, optical and vibrational properties of self-assembled Pbn+1(Ti1−xFex)nO3n+1−δ Ruddlesden-Popper superstructures

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