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Hexagonal LuFeO3 is a multiferroic showing ferroelectricity and antiferromagnetism at room temperature. Below TR=130 K, it becomes ferrimagnetic. Ultrafast optical pump-probe measurements reveal that the dynamics are correlated with the structural changes responsible for ferrimagnetism.
We directly resolve energy transfer pathways from electrons to magnons in multiferroic HoMnO3 using ultrafast optical/terahertz spectroscopy. This reveals that energy is initially transferred from electrons to phonons and subsequently to magnons through spin-lattice relaxation.
We use ultrafast optical microscopy to investigate carrier dynamics in single flakes of atomically thin molybdenum disulfide. By tuning the probe wavelength through the bandgap, we reveal the influence of layer thickness on carrier dynamics.
We demonstrate a new paradigm for all-optical detection and control of interfacial magnetoelectric coupling on ultrafast timescales, achieved by using time-resolved second harmonic generation (SHG) in a ferroelectric/ferromagnet oxide heterostructure.
We demonstrate ultrafast optical control of near field coupled metamaterial resonances. We observed dynamical transition of the metamaterial resonances to change its state from coupled to decoupled, and back to the coupled state under photoexcitation.
Ultrafast optical pump-probe spectroscopy is used to study a heterostructure consisting of superconducting and antiferromagnetic films. We observed a new slow relaxation process that reveals the interaction between superconducting and antiferromagnetic order at the interface.
Terahertz time-domain spectroscopy and temperature dependent femtosecond optical pump-probe spectroscopy are used to track quasiparticle dynamics at the interface between superconducting and ferromagnetic oxide layers.
We demonstrate the ultrafast switching and tuning of the resonance in high temperature superconducting YBCO metamaterial excited by near infrared femtosecond laser pulses. The infrared photons break the Cooper pairs thus destroys the metamaterial resonance.
We map space-and-time-dependent carrier dynamics in single silicon nanowires firstly, using ultrafast optical microscopy. This enables us to directly measure acoustic phonon oscillations and carrier velocities in Si and Si/SiO2 core-shell nanowires.
We present the first ultrafast time-resolved, polarization-dependent experiments on both single- and ensemble-silicon nanowires using non-degenerate spectroscopy. Anisotropy was observed for polarizations perpendicular and parallel to the nanowire.
Spatially-resolved ultrafast transient absorption measurements on a single GaN nanowire give insight into carrier relaxation dynamics as a function of the laser polarization and position on the nanowire on a femtosecond timescale.
Temperature-dependent femtosecond optical spectroscopy is used to track polaron dynamics in the spin and charge frustrated system LuFe2O4, revealing the influence of charge and spin ordering on polaron excitation, redressing, and coupling to on-site excitations.
Visible pump-probe spectroscopy isolates the femtosecond Drude response of a photogenerated electron-hole plasma in monolayer graphene. The observed Vn scaling versus carrier density reveals the relativistic nature of the electron-hole plasma.
We demonstrate active tuning of coupled inductive-capacitive resonance in a multi-layer metamaterial. Our experiment reveals that one resonance mode of a coupled pair can be selectively switched off by driving the metamaterial with infrared light.
An optically-stabilized femtosecond laser optical frequency comb can serve as a source of optical and microwave waveforms with absolute integrated timing jitter on the scale of a few femtoseconds. This ultralow jitter is due to the stability of a passive optical cavity, which is the frequency reference for the system. We will present recent results in the generation of low phase noise 10 GHz signals...
We report a novel ultrafast optical system capable of directly pumping low energy excitations in complex materials and probing the photoinduced changes in their properties with terahertz pulses, benchmarked through mid-infrared-pump, THz-probe measurements on InSb.
We demonstrate an ultrafast (600 fs) dual-band optical switching device using a negative-index metamaterial. A large switching ratio is achieved at both the fundamental (70%) and higher order coupling bands (20%) of the negative-index resonance.
In this paper, an approach employing a 180-MHz repetition rate, diode-pumped Yb-doped tungstate (Yb:KYW) frequency comb is demonstrated. This approach to low noise microwave generation requires the Yb:KYW laser be self-referenced and phase-locked to a stable continuous wave (CW) laser. The Yb:KYW laser functions as an optical-to-microwave frequency divider. An octave spanning spectrum (650-1400 nm)...
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