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The near-field tip-antenna enhanced signal transduction with femtosecond laser pulses allows for spatio-spectral and spatio-temporal imaging and quantum coherent control with the perspective to reach the single electronic or vibrational quantum level.
Terahertz radiation permits resonant and sensitive probing of electron transport, spin precession and ion vibration in solids. Recently developed sources of strong-field terahertz pulses even allow one to gain control over these fundamental modes.
We observe a giant magnetoresistance effect in CoFe/Cu-based multistack using THz time-domain spectroscopy. The magnetic field-dependent dc conductivity, electron scattering time, as well as spin-asymmetry parameter of the structure are successfully determined.
We have observed coherent cyclotron resonance oscillations from a two-dimensional electron gas by combining a rapid scanning terahertz time-domain spectrometer with a table-top mini-coil pulsed magnet.
We demonstrate time- and space-resolved luminescence measurements of quantum degenerate paraexcitons in cuprous oxide. We report dynamics of ultracold excitons such as the drift in a trap potential, cooling process, and lifetime of exctions.
We generated ultrabroadband coherent infrared pulses by focusing hollow-fiber compressed intense 10-fs pulses in air. We also coherently detected the electric-field profiles in the whole infrared range through the field-induced second harmonic generation in air.
We demonstrate a plasmonically enhanced infrared spectroscopy technology that enables in-situ and real-time measurements of protein and nano particle interactions at ultra-high sensitivity by overcoming fundamental water absorption limitations.
Electrons in graphene are described by massless Dirac Fermions with unusual electrical and optical properties. The Moire superlattice in graphene/boron nitride heterostructure strongly modifies the electronic structure, and leads to unusual changes in infrared absorption.
We demonstrate phase-coherent, frequency-stabilized dual-comb system at 2µm, extendable to mid-IR via phase-coherent frequency conversion in a doubly-resonant GaAs OPO. Results of dual-comb molecular spectroscopy with ∼1M spectral points taken in ∼1ms will be presented.
Label free mid-infrared photothermal imaging on bird brain slices is presented. The Amide-I vibrational band is excited by a quantum cascade laser and an Er:doped fiber measures the photothermal response.
An accurate, continuously tunable, terahertz synthesizer was proposed by photomixing of two continuous-wave lasers phase-locked to dual optical combs. This synthesizer enables us to perform the precise THz spectroscopy secured by microwave frequency standard.
We demonstrated combination of spectrally interleaved terahertz (THz) frequency comb with dual-comb spectroscopy, enabling us to achieve the spectral sampling equal to linewidth of the comb tooth in the low-pressure gas spectroscopy in THz region.
We combine ultrafast multi-terahertz spectroscopy and near-field microscopy to achieve sub-wavelength spatial (∼15 nm) and sub-cycle temporal (∼9 fs) resolution. We apply our novel system to photoexcited InAs nanowires and resolve femtosecond carrier dynamics - spatially, temporally and spectrally.
We characterize a new table-top, tunable XUV source spanning 8 to 25 eV based on a femtosecond enhancement cavity. This source is designed to investigate correlated electron systems with angle and time resolved photoemission spectroscopy.
Principles of asynchronous optical parametric oscillator frequency combs are introduced and their performance in dual-comb mid-infrared molecular spectroscopy is presented, including a specific demonstration of methane absorption spectroscopy with a resolution of 0.2 cm−1.
Several common polymers are characterized in the ultra-broadband Terahertz frequency window 2–15 THz using a THz time-domain spectrometer solely based on air-photonics. The spectral features relevant for materials science and THz photonics are revealed.
We probe porous metal-organic framework materials (MOFs) using broadband terahertz (THz) pulses. Water molecules that are absorbed by the pores of the material display intermolecular dynamics differing from those of free water.
We have developed a nonlinear spectral unmixing algorithm that separates fluorescence excitation-emission matrix of multiple fluorophores affected by the inner filter effect. We evaluate this technique on simulated data and demonstrate its superior performance experimentally for a mixture of fluorophores.
We investigate the carrier relaxation dynamics in graphene oxide (GO) using ultrafast optical-pump terahertz-probe spectroscopy. Unlike graphene, we observe the dynamics of GO show rapid percolation behaviors related to the multi-particle Auger scattering.
We demonstrate 2D coherent spectroscopy of CdSe/ZnS nanocrystals and measure the exciton homogeneous linewidth. The 2D spectra also reveal an off-diagonal peak that oscillates as a function of the waiting time T.
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