Thales V. A. G. de Oliveira
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View article: Magnetization-controlled terahertz harmonic generation with grating and cavity structures
Magnetization-controlled terahertz harmonic generation with grating and cavity structures Open
Spintronic terahertz (THz) frequency conversion in ferromagnet/heavy metal (FM/HM) heterostructures has the potential to enhance high-speed data communication and advance ultrafast magnetic memory applications. By leveraging ultrafast spin…
View article: Plasmonic metamaterial time crystal
Plasmonic metamaterial time crystal Open
Periodically driven optical materials and metamaterials have recently emerged as a promising platform for realizing photonic time crystals (PTCs) -- systems whose optical properties are strongly and periodically modulated on time scales co…
View article: Highly efficient broadband THz mixing and upconversion with Dirac materials
Highly efficient broadband THz mixing and upconversion with Dirac materials Open
The use of the THz frequency domain in future network generations offers an unparalleled level of capacity, which can enhance innovative applications in wireless communication, analytics, and imaging. Communication technologies rely on fre…
View article: Time-resolved nanospectroscopy of III–V semiconductor nanowires
Time-resolved nanospectroscopy of III–V semiconductor nanowires Open
We investigate ultrafast electron dynamics in GaAs/InGaAs core–shell nanowires. Our findings highlight the potential of time-resolved nanoscopy for contactless probing of carrier mobility and recombination dynamics in nanostructures.
View article: Highly efficient broadband THz upconversion with Dirac materials
Highly efficient broadband THz upconversion with Dirac materials Open
The use of the THz frequency domain in future network generations offers an unparalleled level of capacity, which can enhance innovative applications in wireless communication, analytics, and imaging. Communication technologies rely on fre…
View article: Terahertz harmonic generation across the Mott insulator-metal transition
Terahertz harmonic generation across the Mott insulator-metal transition Open
We demonstrate terahertz (THz) harmonic generation across the Mott insulator-metal transition in rare-earth nickelates (RNiO$_3$, R = rare-earth atom). The THz harmonic generation is observed in all the three different phases with distinct…
View article: FPGA-based measurements of the relative arrival time of a high-repetition rate, quasi-cw fourth generation light source
FPGA-based measurements of the relative arrival time of a high-repetition rate, quasi-cw fourth generation light source Open
In this paper, we demonstrate the successful implementation of reconfigurable field-programmable gate array technology into a pulse-resolved data acquisition system to achieve a femtosecond temporal resolution in ultrafast pump–probe exper…
View article: THz Second and Third Harmonic Generation in PdCoO$_2$ Thin Films
THz Second and Third Harmonic Generation in PdCoO$_2$ Thin Films Open
Terahertz high harmonic generation (THz HHG) is a common property of nonlinear systems. Recently it has been used to investigate fundamental principles that govern transport and nonlinear dynamics in novel quantum materials like graphene, …
View article: Terahertz-to-Visible Light Conversion in Graphene Metamaterials Controlled by Electrostatic Gate
Terahertz-to-Visible Light Conversion in Graphene Metamaterials Controlled by Electrostatic Gate Open
We have demonstrated gate-tunable sub-nanosecond conversion of THz light to visible UV light in graphene [1]. Electrostatic gating in the range of 1-2 V allows to change the conversion efficiency by a factor of 30. An additional metallic g…
View article: Tracing the dynamics of superconducting order via transient terahertz third-harmonic generation
Tracing the dynamics of superconducting order via transient terahertz third-harmonic generation Open
Ultrafast optical control of quantum systems is an emerging field of physics. In particular, the possibility of light-driven superconductivity has attracted much of attention. To identify nonequilibrium superconductivity, it is necessary t…
View article: Spin-orbit interaction driven terahertz nonlinear dynamics in transition metals
Spin-orbit interaction driven terahertz nonlinear dynamics in transition metals Open
The interplay of electric charge, spin, and orbital polarizations, coherently driven by picosecond long oscillations of light fields in spin-orbit coupled systems, is the foundation of emerging terahertz spintronics and orbitronics. The es…
View article: Tunable room temperature nonlinear Hall effect from the surfaces of elementary bismuth thin films
Tunable room temperature nonlinear Hall effect from the surfaces of elementary bismuth thin films Open
The nonlinear Hall effect (NLHE) with time-reversal symmetry constitutes the appearance of a transverse voltage quadratic in the applied electric field. It is a second-order electronic transport phenomenon that induces frequency doubling a…
View article: Giant THz Nonlinearity in Topological and Trivial HgTe-Based Heterostructures
Giant THz Nonlinearity in Topological and Trivial HgTe-Based Heterostructures Open
Nonlinear phenomena in the THz spectral domain are important for understanding the optoelectronic properties of quantum systems and provide a basis for modern information technologies. Here, we report a giant THz nonlinearity in high-mobil…
View article: Terahertz Twistoptics -- engineering canalized phonon polaritons
Terahertz Twistoptics -- engineering canalized phonon polaritons Open
The terahertz (THz) frequency range is key to study collective excitations in many crystals and organic molecules. However, due to the large wavelength of THz radiation, the local probing of these excitations in smaller crystalline structu…
View article: Impulsive Fermi magnon-phonon resonance in antiferromagnetic $CoF_{2}$
Impulsive Fermi magnon-phonon resonance in antiferromagnetic $CoF_{2}$ Open
Understanding spin-lattice interactions in antiferromagnets is one of the most fundamental issues at the core of the recently emerging and booming fields of antiferromagnetic spintronics and magnonics. Recently, coherent nonlinear spin-lat…
View article: Terahertz Harmonic Generation from Graphite Pencil Drawings
Terahertz Harmonic Generation from Graphite Pencil Drawings Open
The third harmonic generation (THG) of graphite layers on paper substrate upon excitation with intense (up to 100 kV cm −1 ) narrowband terahertz (THz) pulses is studied. Highest THG efficiencies are comparable with those of chemical vapor…
View article: Ultrafast Tunable Terahertz-to-Visible Light Conversion through Thermal Radiation from Graphene Metamaterials
Ultrafast Tunable Terahertz-to-Visible Light Conversion through Thermal Radiation from Graphene Metamaterials Open
Several technologies, including photodetection, imaging, and data communication, could greatly benefit from the availability of fast and controllable conversion of terahertz (THz) light to visible light. Here, we demonstrate that the excep…
View article: Tracing the dynamics of superconducting order via transient third harmonic generation
Tracing the dynamics of superconducting order via transient third harmonic generation Open
Ultrafast optical control of quantum systems is an emerging field of physics. In particular, the possibility of light-driven superconductivity with ultrashort laser pulses has attracted much of attention. To identify non-equilibrium superc…
View article: Germanium Monosulfide as a Natural Platform for Highly Anisotropic THz Polaritons
Germanium Monosulfide as a Natural Platform for Highly Anisotropic THz Polaritons Open
Terahertz (THz) electromagnetic radiation is key to access collective excitations such as magnons (spins), plasmons (electrons), or phonons (atomic vibrations), thus bridging topics between optics and solid-state physics. Confinement of TH…
View article: Field-resolved THz-pump laser-probe measurements with CEP-unstable THz light sources
Field-resolved THz-pump laser-probe measurements with CEP-unstable THz light sources Open
Radiation sources with a stable carrier-envelope phase (CEP) are highly demanded tools for field-resolved studies of light-matter interaction, providing access both to the amplitude and phase information of dynamical processes. At the same…
View article: Terahertz-slicing — an all-optical synchronization for 4<sup>th</sup> generation light sources
Terahertz-slicing — an all-optical synchronization for 4<sup>th</sup> generation light sources Open
A conceptually new approach to synchronizing accelerator-based light sources and external laser systems is presented. The concept is based on utilizing a sufficiently intense accelerator-based single-cycle terahertz pulse to slice a thereb…
View article: Spin-orbit torque mediated coupling of terahertz light with nanometer-wavelength magnon modes
Spin-orbit torque mediated coupling of terahertz light with nanometer-wavelength magnon modes Open
Nonvolatile and energy-efficient spin-based technologies call for new prospects for realization of logic devices able to operate at terahertz (THz) frequencies. For instance, magnonic elements require an efficient generation of high-energy…
View article: Germanium monosulfide as a natural platform for highly anisotropic THz polaritons
Germanium monosulfide as a natural platform for highly anisotropic THz polaritons Open
Terahertz (THz) electromagnetic radiation is key to optically access collective excitations such as magnons (spins), plasmons (electrons), or phonons (atomic vibrations), thus bridging between optics and solid-state physics. Confinement of…
View article: Terahertz signatures of ultrafast Dirac fermion relaxation at the surface of topological insulators
Terahertz signatures of ultrafast Dirac fermion relaxation at the surface of topological insulators Open
Topologically protected surface states present rich physics and promising spintronic, optoelectronic, and photonic applications that require a proper understanding of their ultrafast carrier dynamics. Here, we investigate these dynamics in…