A5088816766- Luminescence Properties of Advanced Materials
- Diamond and Carbon-based Materials Research
- Perovskite Materials and Applications
- Gold and Silver Nanoparticles Synthesis and Applications
- Optical properties and cooling technologies in crystalline materials
- Plasmonic and Surface Plasmon Research
- Laser-Matter Interactions and Applications
- Advanced Electron Microscopy Techniques and Applications
- Advanced Surface Polishing Techniques
- Electron and X-Ray Spectroscopy Techniques
- Electrochemical Analysis and Applications
- Luminescence and Fluorescent Materials
- Laser Design and Applications
- Advanced Optical Sensing Technologies
- Laser-Ablation Synthesis of Nanoparticles
- Photoreceptor and optogenetics research
- Photonic and Optical Devices
- Force Microscopy Techniques and Applications
- Electronic and Structural Properties of Oxides
- bioluminescence and chemiluminescence research
- Copper-based nanomaterials and applications
- nanoparticles nucleation surface interactions
- Optical Coatings and Gratings
- Nonlinear Optical Materials Studies
- Atomic and Subatomic Physics Research
Tokyo Institute of Technology
2020-2024
Highly efficient green emission of Cs 4 PbBr 6 has been attributed to intermediate states formed by embedded CsPbBr 3 nanocrystals or defects. However, direct experimental confirmation the presence such nano-emitters is not straightforward and mechanism remains elusive. By using cathodoluminescence (CL) imaging with a high spatial resolution, we demonstrate that within matrix contribute emission, exhibiting optical behavior distinct from matrix. Additionally, explore its potential as an...
We measured the second-order correlation function of cathodoluminescence intensity and investigated Purcell effect by comparing lifetimes quantum emitters with without metal structure. The increase in electromagnetic local density state due to coupling a emitter plasmonic structure causes shortening lifetime, which is called effect. Since plasmon-enhanced electric field confined well below wavelength light, lifetime changed nanoscale range. In this study, we combined scanning (transmission)...
Abstract Electron microscopy based on high-energy electrons allows nanoscopic analytical imaging taking advantage of secondarily generated particles. Especially for cathodoluminescence, the correlation between primary incident and emitted photons includes information entire interaction process. However, electron-photon time tracking relaxation dynamics luminescent materials has so far not been achieved. In this work, we propose time-correlated electron photon counting microscopy, where...
We investigate a one-dimensional plasmonic crystal using momentum-resolved electron energy-loss spectroscopy (EELS) and cathodoluminescence (CL) techniques, which are complementary in terms of available optical information. The sample is fabricated from large aluminum grains through the focused ion beam method. This approach allows curving nanostructures with high crystallinity, providing platforms for detailed analysis both EELS CL. visualizes dispersion curves outside light cone,...
Metallic nanoparticles have been widely studied because of their unique and potentially useful optical properties, they are expected to be applied high-performance photocatalyst sensing applications. In particular, noble metals, such as Au, Ag, Cu, exhibit resonances based on surface plasmons, which can efficiently generate hot electrons. One strategy fully tune the properties these metal is engineer dielectric by alloying, however not trivial due existence interphase thermodynamic phase...
Short range ordered (SRO) plasmonic nanohole arrays have a distinct surface plasmon polariton resonance in the visible region and exhibit an excellent sensing capability toward changes surrounding refractive index. While SRO perfectly hole similar properties, clear advantages fabrication, simplicity, scalability. In this study, we use gold nanoholes, which are subjected to pressure temperature cycles, for vacuum sensing. The response of transmission spectra 10−3–105 Pa scans 20–400 °C was...
Time-resolved or time-correlation measurements using cathodoluminescence (CL) reveal the electronic and optical properties of semiconductors, such as their carrier lifetimes, at nanoscale. However, halide perovskites, which are promising optoelectronic materials, exhibit significantly different decay dynamics in CL photoluminescence (PL). We conducted CsPbBr3 Hanbury Brown-Twiss interferometry compared them with time-resolved PL. The measured time was on order subnanoseconds faster than PL...
Cathodoluminescence (CL), the emission of light induced by accelerated free electrons, has been extensively utilized in various applications, such as displays, streak cameras, and high-spatial-resolution analysis optical material, surpassing diffraction limit light. Despite its long history, photon statistics CL have only recently examined, revealing unexpectedly large bunching photons. Here we find that this peculiar contains information intervening excitation processes before emission,...
Hanbury Brown and Twiss (HBT) interferometry is a milestone experiment that transformed our understanding of the nature light. The concept was demonstrated in 1956 to measure radii stars through photon coincidence detection. This form detection later became cornerstone modern quantum optics. Here we connect HBT physics scintillation, process spontaneous light emission upon excitation by high-energy particles, such as x-rays. Our work reveals intrinsic bunching scintillation process, which...
Electron microscopy based on high-energy electrons allows nanoscopic analytical imaging taking advantage of secondarily generated particles. Especially for cathodoluminescence, the correlation between primary incident and emitted photons includes information entire interaction process. However, electron-photon time tracking relaxation dynamics luminescent materials has so far not been achieved. In this work, we propose time-correlated electron photon counting microscopy, where coincidence...