A5077923256- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Multiferroics and related materials
- Pancreatic function and diabetes
- Rare-earth and actinide compounds
- Solid-state spectroscopy and crystallography
- Electrical and Thermal Properties of Materials
- Magneto-Optical Properties and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Electronic and Structural Properties of Oxides
- Crystal Structures and Properties
- Nanofabrication and Lithography Techniques
- Magnetic Properties and Synthesis of Ferrites
- Metabolism, Diabetes, and Cancer
- Semiconductor materials and devices
- Diabetes and associated disorders
- Force Microscopy Techniques and Applications
- Diabetes Management and Research
- Near-Field Optical Microscopy
- Advanced Biosensing Techniques and Applications
- Advanced Fluorescence Microscopy Techniques
- High-pressure geophysics and materials
- Semiconductor Quantum Structures and Devices
- Growth Hormone and Insulin-like Growth Factors
- Advancements in Semiconductor Devices and Circuit Design
Shibaura Institute of Technology
2023
The University of Tokyo
1996-2008
National Institute of Advanced Industrial Science and Technology
2004
Abstract Conventional optical microscopes have a limit in resolution by diffraction of light. Here, we propose cylindrical microstructure-assisted nanoscale imaging to enhance the limit. The microstructures with diameters 3, 5, 7, and 9 μm were produced proton beam writing poly(methyl methacrylate) on nanopatterns commercial Blu-ray discs. Accordingly, disc imaged through using an Olympus LEXT OLS4000 confocal microscope determine microstructure performances for assisting nanoimaging....
We have investigated anisotropic optical conductivity spectra over a wide temperature range, $10 \mathrm{K}<~T<~800 \mathrm{K},$ for detwinned single crystal of ${\mathrm{LaMnO}}_{3},$ which undergoes the orbital ordering at ${T}_{\mathrm{OO}}\ensuremath{\approx}780 \mathrm{K}$ and A-type antiferromagnetic ${T}_{N}\ensuremath{\approx}140 \mathrm{K}.$ The charge-gap transition peaking around 2 eV shows clear anisotropy polarizations parallel perpendicular to c axis $(Pbnm$ setting). With...
To investigate the effect of charge-spin-orbital correlations on electronic structures, anisotropic optical conductivity spectra have been investigated for twin-free crystals various doped manganites ${R}_{1\ensuremath{-}x}{A}_{x}{\mathrm{MnO}}_{3}$ $(R=\mathrm{Pr}$ and Nd, $A=\mathrm{Ca}$ Sr; $0.4<~x<~0.7)$ with pseudo-cubic perovskite structure. In having an antiferromagnetic ground state, a remarkable anisotropy has observed in their spectra, reflecting respective ferroic/antiferroic...
The electronic structure of bilayered manganite $({\mathrm{La}}_{2\ensuremath{-}2x}{\mathrm{Sr}}_{1+2x}{\mathrm{Mn}}_{2}{\mathrm{O}}_{7})$ has been investigated by optical measurements. In the paramagnetic phase, in-plane and out-of-plane spectra show a doping dependence reflecting change in orbital character conduction electrons. A drastic structural observed with evolution magnetic ordering irrespective ferromagnetic (e.g., $x=0.4)$ or antiferromagnetic $(x=0.3)$ interbilayer coupling....
To clarify the physiological roles of insulin receptor substrate‐1 (IRS‐1) in vivo , we made mice with a targeted disruption IRS‐1 gene locus. Mice homozygous for were born alive but retarded embryonal and postnatal growth. They also had resistance to glucose‐lowering effects insulin, insulin‐like growth factor‐1 (IGF‐1) factor‐2 (IGF‐2). These data suggest existence both IRS‐1‐dependent IRS·1·independent pathways signal transduction IGFs. Moreover, identified tyrosine phosphorylation...
We have spectroscopically investigated the orbital-ordered states in ${\mathrm{Nd}}_{1\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{MnO}}_{3}$ $(x=0.55$ and 0.7) with ferroic order of ${d}_{{x}^{2}\ensuremath{-}{y}^{2}}\ensuremath{-}\mathrm{type}$ ${d}_{{3z}^{2}\ensuremath{-}{r}^{2}}\ensuremath{-}\mathrm{type}$ orbitals, respectively. The optical conductivity spectra twin-free crystals are highly anisotropic respect to light polarizations parallel perpendicular direction orbital lobes....
Photonic nanojet (PNJ) is an optical phenomenon that focuses incident light to a sub-wavelength beam waist/width and several wavelength long length by scattering with microstructure. Here, we report on the PNJs directly generated along axial axis of poly(methyl methacrylate) (PMMA) micro-cylinders 2, 4, 6, 8 μm diameters fabricated proton writing approach. Experimental results reveal PMMA were produced smooth surfaces, which are appropriate form PNJs. Accordingly, measured using in-house...
Raman scattering was investigated for a single crystal of LaMnO3. In the orbitally ordered ground state, clear structure between 120 meV and 170 appears, which is relevant to collective excitation orbital degree freedom called “orbital wave.” The intensity bands rapidly decreases above Neel temperature. This indicates that coherence wave suppressed in absence static spin order. peak energy decreased with increasing temperature toward order-disorder T∞. suppression Jahn-Teller distortion as...