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We apply CEAS technique to monitor trace acetylene gas in oil as marker of power transformer diagnosis. Developed CEAS sensor can detect trace acetylene gas as low as 8ppb in a few seconds.
One of the key technologies for optical inter-satellite communication equipment is the rapid, highly accurate acquisition and tracking of the corresponding satellite. Therefore, we are developing a prototype of an acquisition and tracking system. This paper describes the specifications and performance test results of the prototype acquisition and tracking system.
In this paper, we report on a binary holographic technique to store and retrieve surface plasmon waves. As an example, the in-plane Airy plasmon is reconstructed by launching surface plasmon waves from subwavelength hologram pattern.
SEIRA spectroscopic measurement using the metal hole array (MHA) is demonstrated with high spectral selectivity. The molecular IR absorption peaks are enhanced up to 10 times at the transmission peak of MHA structure.
A novel type of dielectric microdisk resonator for integrated optics is proposed. The disk has angular grating on its sidewall, which exhibits guided-mode resonance (GMR) and thus functions as a highly reflective mirror for diverging waves inside the disk. Due to the wavelength sensitive property of GMR, a particular cavity mode can have large quality factor (Q) than other ones. Basic optical characteristics...
We investigated a whispering gallery mode cavity with a hexagonal cross-section using the two-dimensional finite-difference time-domain method. We studied the dependence of Q on the curvature radius of the polygonal cavities and found two different modes; “perturbed-WGM” and “quasi-WGM”, of which the former exhibits the higher Q. We also fabricated a cavity by employing laser heated pedestal growth...
A new systematic hole-shifting rule enhances the Q factor of a Ln (n:2-5) nanocavity one order of magnitude both in theory and experiment. The simple rule allows experimental Q optimization without the help of simulations.
Rapid, polarization-resolved second-harmonic-generation (SHG) microscopy was achieved based on an electro-optics-modulator-based polarization modulation. This system enables us to visualize orientation mapping of dermal collagen fiber in skin in vivo without influence of motion artifacts.
Lateral current injection (LCI) type membrane distributed feedback (DFB) lasers, proposed as light sources for on-chip optical wiring in LSIs, were theoretically investigated from aspects of low power consumption operation and high-speed direct modulation capability. It was confirmed that the LCI-membrane-DFB laser can be a good candidate for a low-pulse-energy (100 fJ/b) light source at high-speed...
The fuel cell was fabricated on the sensing plate and the catalytic reaction of the electrode was measured using terahertz chemical microscope. Change in the amplitude of THz at the catalytic cathode and anode could be observed.
We investigate the photocurrent generation in a silicon waveguide embedded with interleaved p-n junctions. Due to the surface-state absorption and the high built-in electrical-field, the responsivity reaches ∼14.9 mA/W and the bandwidth is 11.5 GHz.
A photonic topological insulator can be constructed from a lattice of ring resonators, without using aperiodic couplers or metamaterials. With gain and loss, the system can function as an optical diode for coupled resonator modes.
We propose a resonant cavity-enhanced quantum-dot infrared photodetectors with a top mirror of Ge/SiO2 sub-wavelength grating. With a total thickness of ∼7.7 μm, the simulated maximum absorption is ∼60–70% at 8 μm with an enhancement factor of ∼6–20.
Space-borne infrared detectors require higher sensitivity, higher resolution, and larger formats than ground-based infrared detectors. In order to meet more demanding mission requirements, JAXA decided to position infrared detector technology as a strategic technology and promote its development. InAs/GaSb type II superlattices (T2SL) are the only known infrared material with a performance theoretically...
We have developed a semiconductor optical amplifier integrated λ/4 phase-shifted 1.3-μm dual-mode laser as an optical beat source for continuous-wave (CW) terahertz (THz) generation. The CW THz system is also demonstrated with low-temperature-grown InGaAs photomixers.
We demonstrated systematic investigations on the mechanism of remote coherent N2+ emission in air using a pump-probe configuration. Our experimental results suggest lasing action based on instantaneous population inversion is the most likely mechanism.
P-implanted ZnO nanorods were annealed by a KrF excimer laser at different repetition rate. The entire implanted region of ZnO nanorods was annealed beyond the optical-absorption length at high repetition rate.
We experimentally and theoretically investigate the underlying physical mechanism of ultrafast laser glass microwelding using double-pulse irradiation based on transient absorption change of 2nd pulse with various pulse energy induced by 1st pulse irradiation.
We visualized that semiconducting single wall carbon nanotubes (SWCNTs) represent metallic property at a point where a few tubes crossed each other, by tip-enhanced Raman scattering (TERS) microscopy.
We experimentally and numerically investigate terahertz plasmonic responses in a coupled system of structured graphene and a heavily-doped Si substrate. Gate-voltage-controllable magnetic plasmon resonances arising from the plasmon hybridization are demonstrated at terahertz frequencies.
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