The phonon frequencies of metallic ultrathin films were studied by the resonant acoustic-phonon spectroscopy using femtosecond pump-probe method. We excite and detect the acoustic-phonon resonances in the thin films thinner than 50 nm using the femtosecond light pulses. The pump light causes the phonon vibrations through the thermal expansion at the film surface. For the ultrathin films, the st...

In P3HT:PCBM based organic solar cells we propose and demonstrate numerically plasmonic backcontact grating architectures for strong optical absorption enhanced in both transverse-magnetic and transverse-electric polarizations. Even when the active material is partially replaced by the metallic grating (without increasing the active layer film thickness), we show computationally that the light ...

Due to their small size, extremely fast response, and low cost, refractory metallic thin film thermocouples (TFTCs) are well suited for the surface temperature measurement of hot components. In this study, PtRh films with different amounts of Rhodium (10% and 13%) were deposited with direct current magnetron sputtering and annealed at different temperatures in air. The chemistry, microstructure...

We report on the operation of a highly sensitive terahertz imaging system relying on a planar metallic plasmonic crystal as a terahertz surface plasmon resonant (THz-SPR) sensor. The terahertz imaging is based on the resonantly enhanced transmission phenomenon of a periodically perforated metal film. The detection sensitivity and the imaging contrast for small amounts of substance are considera...

The electrical characteristics and stabilities of dual-gate (DG) coplanar homojunction amorphous indium-gallium-zinc-oxide thin-film transistors (a-IGZO TFTs) are described. When the gate voltage is applied on top and bottom electrodes, the DG a-IGZO TFT showed an excellent electrical performance with the subthreshold swing of 99 mV/dec, the mobility of 15.1 cm/V·s and the on-off ratio of 10. U...

We investigate the properties of the modes supported by three-dimensional subwavelength plasmonic slot waveguides. We show that the fundamental mode supported by a symmetric plasmonic slot waveguide, composed of a subwavelength slot in a thin metallic film embedded in an infinite homogeneous dielectric, is always a bound mode. Its modal fields are highly confined over a wavelength range extendi...