Emission mechanisms of InGaN single quantum well blue and green light emitting diodes
and multiquantum well structures were investigated by means of modulation spectroscopy …

Three kinds of ionic liquids, 1-alkyl-3-methylimidazolium tetrafluoroborate (n= 2–4), were
prepared and fundamental properties of ionic liquids and those mixed with industrially used …

We design and implement a multipixel spatial modulator for terahertz beams using active
terahertz metamaterials. Our first-generation device consists of a 4× 4 pixel array, where …

We report the first observation of Stimulated Raman Scattering (SRS) in silicon waveguides.
Amplification of the Stokes signal, at 1542.3 nm, of up to 0.25 dB has been observed in …

A combination of accumulative roll bonding (ARB) and rolling is used to fabricate
nanolamellar Cu–Nb multilayers with individual layer thicknesses (h) of 600μm⩾ h⩾ 10nm …

Two sources of room temperature visible luminescence are identified from SiO2 films
containing ion beam synthesized Si nanocrystals. From a comparison of luminescence …

The growth of bulk crystals of organic salts with large chromophoric has received little
attention, despite the importance of crystal quality for both applications and research. Here …

We demonstrate a monolithic waveguide sensor integrated with a detector on-chip for mid-
infrared absorption spectroscopic sensing. The optical sensing element comprises a …

We investigated the pressure behavior of yellow luminescence in bulk crystals and epitaxial
layers of GaN. This photoluminescence band exhibits a blueshift of 302 meV/GPa for …

The influence of biaxial stress on the optical properties of thin GaN films is studied by x‐ray
diffraction and Raman and photoluminescence spectroscopy. The stress is caused by …