RIKEN Center for Advanced Photonics

Observation of near-infrared fluorescence from within biological specimens using X-ray light-sheet microscopy for deep-tissue imaging

Abstract Light-sheet fluorescence microscopy enables rapid three-dimensional imaging of biological specimens with low phototoxicity and high signal-to-noise ratio, but its imaging depth is limited by optical scattering and absorption in tissue. X-ray light-sheet microscopy, terme...

REAP1/AtSWAP70 integrates RAB5 and ROP signalling during sexual reproduction

Small GTPases of the Ras superfamily are critical regulators of diverse cellular processes. While crosstalk between their signalling pathways has been documented in animals, similar mechanisms remain unexplored in plants, where small GTPases have undergone unique evolutionary div...

Phase-shift Instanton Approach to Tunneling Duality in Read–Rezayi State

We study the duality between quasi-particle and electron tunneling in point-contact geometries of fractional quantum Hall states. To treat non-Abelian edge operators, we introduce a “phase-shift instanton” that incorporates phase factors from primary fields into the instanton gas...

Strong coupling between RF photons and plasmons of electrons on liquid helium

Plasmons, arising from the collective motion of electrons, can interact strongly with electromagnetic fields or photons; this capability has been exploited across a broad range of applications, from chemical reactivity to biosensing. Recently, there has been growing interest in p...

Microsecond Barrier-Crossing Collapse in Cytochrome c Folding Revealed by Two-Dimensional Fluorescence Lifetime Correlation Spectroscopy

Abstract Protein folding is initiated with a volume contraction called collapse. While the microsecond collapse of horse cyt c has been intensely studied, its molecular mechanism remains elusive. To characterize the structural change, we prepared three cyt c variants labeled with...

Submicrometer focusing of isolated attosecond XUV pulses approaching 1016 W/cm2

We demonstrate submicrometer focusing of isolated attosecond pulses (IAPs) in the extreme ultraviolet (XUV) region using a custom ellipsoidal mirror. The obtained focal spot sizes were verified using knife-edge measurements with a sharp silicon edge, confirming reproducible dimen...

Cryogenic time-division-multiplexed voltage control for scalable trapped-ion quantum processors

Trapped-ion quantum computers based on the quantum charge-coupled device architecture require on the order of ten trap electrodes per qubit, making the number of vacuum feedthroughs a bottleneck at the system scale. Time-division multiplexed (TDM)-based voltage control for trap e...