Yusuke Arashida
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View article: Ultrafast Surface Phenomena Studied by Lightwave-driven Scanning Tunneling Microscopy
Ultrafast Surface Phenomena Studied by Lightwave-driven Scanning Tunneling Microscopy Open
View article: Ultrafast dynamics of carrier relaxation determining the quasi-1D and non-1D electronic behaviors in carbon nanostructures
Ultrafast dynamics of carrier relaxation determining the quasi-1D and non-1D electronic behaviors in carbon nanostructures Open
View article: Next-Generation Time-Resolved Scanning Probe Microscopy
Next-Generation Time-Resolved Scanning Probe Microscopy Open
Understanding the nanoscale carrier dynamics induced by light excitation is the key to unlocking futuristic devices and innovative functionalities in advanced materials. Optical pump-probe scanning tunneling microscopy (OPP-STM) has opened…
View article: Polphylipoprotein-induced autophagy mechanism with high performance in photodynamic therapy
Polphylipoprotein-induced autophagy mechanism with high performance in photodynamic therapy Open
View article: Time-resolved force microscopy using the delay-time modulation method
Time-resolved force microscopy using the delay-time modulation method Open
We developed a time-resolved force microscopy technique by integrating atomic force microscopy using a tuning-fork-type cantilever with the delay time modulation method for optical pump-probe light. We successfully measured the dynamics of…
View article: Electronic intraband scattering in a transition-metal dichalcogenide observed by double-excitation ultrafast electron diffraction
Electronic intraband scattering in a transition-metal dichalcogenide observed by double-excitation ultrafast electron diffraction Open
Electronic dynamics in the excited state of transition-metal dichalcogenides (TMDs) has attracted great interest. To understand the ultrafast intraband scattering process of excited electrons in the conduction band, we demonstrated ultrafa…
View article: Pulse-to-pulse ultrafast dynamics of highly photoexcited Ge<sub>2</sub>Sb<sub>2</sub>Te<sub>5</sub> thin films
Pulse-to-pulse ultrafast dynamics of highly photoexcited Ge<sub>2</sub>Sb<sub>2</sub>Te<sub>5</sub> thin films Open
Observing ultrafast pulse-to-pulse dynamics of highly photoexcited materials could foster a comprehensive understanding of the initial stage of irreversible photoinduced events, such as phase change, structural deformation, and laser ablat…
View article: Cell-Level Analysis Visualizing Photodynamic Therapy with Porphylipoprotein and Talaporphyrin Sodium
Cell-Level Analysis Visualizing Photodynamic Therapy with Porphylipoprotein and Talaporphyrin Sodium Open
We revealed the difference in the mechanism of photodynamic therapy (PDT) between two photosensitizers: porphylipoprotein (PLP), which has recently attracted attention for its potential to be highly effective in treating cancer, and talapo…
View article: Ultrafast nanoscale exciton dynamics via laser-combined scanning tunneling microscopy in atomically thin materials
Ultrafast nanoscale exciton dynamics via laser-combined scanning tunneling microscopy in atomically thin materials Open
Long-term stable excitons, bound pairs of electrons and holes, in van der Waals materials were found to be handled at room temperature, paving the way to develop optoelectronic/photonic devices for future high-speed communication technolog…
View article: Phase-controllable multi-laser system with coaxially combined near-infrared and subcycle mid-infrared and THz pulsed beams
Phase-controllable multi-laser system with coaxially combined near-infrared and subcycle mid-infrared and THz pulsed beams Open
With the progress of infrared high-intensity pulse technology, the ultrafast control of electronic states has been attracting considerable attention. Most elementary excitations of solids have resonance energy in the mid-infrared (MIR) fre…
View article: Laser-combined multiprobe microscopy and its application to the materials with atomic layer thickness
Laser-combined multiprobe microscopy and its application to the materials with atomic layer thickness Open
We have developed a method of evaluating the photo-induced carrier dynamics of nanostructures by combining optical technologies with multiprobe microscopy techniques. Using multiple probes, measurement can be carried out even for a small s…
View article: Ultrafast Dynamics Measurement by STM Combined with Advanced Optical Technologies
Ultrafast Dynamics Measurement by STM Combined with Advanced Optical Technologies Open
In recent years, the rapid development of technology coupling optical light with Scanning Probe Microscopes has made it possible to investigate the quantum dynamics of materials and unravel the light-matter interaction on the atomic scale …
View article: Low-frequency multiplex CARS microscopy with a high-repetition near-infrared supercontinuum laser
Low-frequency multiplex CARS microscopy with a high-repetition near-infrared supercontinuum laser Open
We have developed a multiplex coherent anti-Stokes Raman scattering microscope effective for low-wavenumber measurement by combining a high-repetition supercontinuum light source of 1064 nm and a near-infrared high-sensitivity InGaAs diode…
View article: Observation of ultrafast amorphization dynamics in GeCu2Te3 thin films using echelon-based single-shot transient absorbance spectroscopy
Observation of ultrafast amorphization dynamics in GeCu2Te3 thin films using echelon-based single-shot transient absorbance spectroscopy Open
The compound GeCu2Te3 (GCT) has attracted considerable attention because of its several advantages for next-generation nonvolatile memories, including its higher thermal stability and lower volume change, with large optical contrast betwee…
View article: Terahertz Scanning Tunneling Microscopy for Visualizing Ultrafast Electron Motion in Nanoscale Potential Variations
Terahertz Scanning Tunneling Microscopy for Visualizing Ultrafast Electron Motion in Nanoscale Potential Variations Open
Studying the microscopic behavior of free carriers in materials at an ultrashort time scale is critical to developing semiconductor, optoelectronic, and other technologies satisfying the ever-increasing requirements for smaller sizes and h…
View article: High-throughput terahertz spectral line imaging using an echelon mirror
High-throughput terahertz spectral line imaging using an echelon mirror Open
This work demonstrates terahertz (THz) line imaging that acquires broadband spectral information by combining echelon-based single-shot THz spectroscopy with high-sensitivity phase-offset electrooptic detection. An approximately 40 dB sign…
View article: Nanoscale phase change on Ge2Sb2Te5 thin films induced by optical near fields with photoassisted scanning tunneling microscope
Nanoscale phase change on Ge2Sb2Te5 thin films induced by optical near fields with photoassisted scanning tunneling microscope Open
A scanning probe microscope coupled with either femtosecond laser pulses or terahertz pulses holds great promise not only for observing ultrafast phenomena but also for fabricating desirable structures at the nanoscale. In this study, we d…
View article: Sub-cycle Manipulation of Electrons in a Tunnel Junction with Phase-controlled Single-cycle THz Near-fields
Sub-cycle Manipulation of Electrons in a Tunnel Junction with Phase-controlled Single-cycle THz Near-fields Open
By utilizing terahertz scanning tunneling microscopy (THz-STM) with a carrier envelope phase shifter for broadband THz pulses, we could successfully control the near-field-mediated electron dynamics in a tunnel junction with sub-cycle prec…
View article: Ultrafast carrier generation in Bi<sub>1-<i>x</i></sub>Sb<sub><i>x</i></sub> thin films induced by intense monocycle terahertz pulses
Ultrafast carrier generation in Bi<sub>1-<i>x</i></sub>Sb<sub><i>x</i></sub> thin films induced by intense monocycle terahertz pulses Open
Using terahertz-pump and terahertz-probe spectroscopy, we investigated terahertz-induced carrier generation processes in Bi 1- x Sb x thin films. The field dependence of the terahertz-induced transmittance change indicates distinct nonline…
View article: Terahertz-field-induced carrier generation in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi mathvariant="normal">B</mml:mi><mml:msub><mml:mi mathvariant="normal">i</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:mi mathvariant="normal">S</mml:mi><mml:msub><mml:mi mathvariant="normal">b</mml:mi><mml:mi>x</mml:mi></mml:msub></mml:mrow></mml:math> Dirac electron systems
Terahertz-field-induced carrier generation in Dirac electron systems Open
Terahertz-field-induced carrier generation processes were investigated in Dirac electron systems, single-crystalline bismuth antimony alloy thin films (Bi1−xSbx; 0≤x≤0.16). This investigation was performed by precisely tuning, via the subs…
View article: Simultaneous acquisition of complex transmittance and birefringence with two counter-rotating, circularly polarized THz pulses
Simultaneous acquisition of complex transmittance and birefringence with two counter-rotating, circularly polarized THz pulses Open
Here we demonstrate simultaneous measurements of the complex transmittance and birefringence using left- and right-handed circularly polarized terahertz (THz) pulses. We change the polarization of the THz pulses periodically by modulating …
View article: Ultrafast optical control of multiple coherent phonons in silicon carbide using a pulse-shaping technique
Ultrafast optical control of multiple coherent phonons in silicon carbide using a pulse-shaping technique Open
We demonstrated ultrafast optical control of multiple coherent phonons in silicon carbide (SiC) using a pulse-shaping technique combined with sub-10-fs optical pulses and a two-dimensional spatial light modulator. Because our technique pro…
View article: Nonlinear terahertz dynamics of Dirac electrons in Bi thin films
Nonlinear terahertz dynamics of Dirac electrons in Bi thin films Open
By using both linear and nonlinear terahertz spectroscopy on epitaxial Bi and Bi1-xSbx thin films, we systematically investigated the linear and nonlinear terahertz dynamics of Dirac electrons. The linear terahertz transmittance was analyz…
View article: Tailoring Single-Cycle Near Field in a Tunnel Junction with Carrier-Envelope Phase-Controlled Terahertz Electric Fields
Tailoring Single-Cycle Near Field in a Tunnel Junction with Carrier-Envelope Phase-Controlled Terahertz Electric Fields Open
Light-field-driven processes occurring under conditions far beyond the diffraction limit of the light can be manipulated by harnessing spatiotemporally tunable near fields. A tailor-made carrier envelope phase in a tunnel junction formed b…
View article: Anharmonic phonon-polariton dynamics in ferroelectric LiNbO3 studied with single-shot pump-probe imaging spectroscopy
Anharmonic phonon-polariton dynamics in ferroelectric LiNbO3 studied with single-shot pump-probe imaging spectroscopy Open
We demonstrate that single-shot pump-probe imaging spectroscopy with an echelon mirror enables us to disclose the ferroelectric phonon-polariton dynamics across a wide temperature range from 10 K to 375 K while avoiding the photorefractive…