Shunsuke Murai

Directional outcoupling of photoluminescence from Eu(III)-complex thin films by plasmonic array

A plasmonic array, consisting of metallic nanocylinders periodically arranged with a pitch comparable to the optical wavelength, is a system in which both the localized surface plasmon polaritons (SPPs) and diffraction in the plane of the array are simultaneously excitable. When combined with a phosphor film, the array acts as a photoluminescence (PL) director and enhancer. Since the array can modify both excitation and emission processes, the overall modification mechanism is generally complex and difficult to understand. Here, we examined the mechanism by simplifying the discussion using an emitter with a high quantum yield, large Stokes shift, and long PL lifetime. Directional PL enhancement as large as five-fold occurred, which is mainly caused by outcoupling, i.e., the PL trapped in the emitter film by total internal reflection is extracted into free space through the SPPs and diffraction. The present scheme is robust and applicable to arbitrary emitters, and it is useful for designing compact and ef...

Second-Harmonic Generation in Thermally Poled Tellurite Glass Containing Silver Nanoparticles

Second-harmonic generation has been observed in thermally poled Na2O-ZnO-TeO2glasses containing Ag nanoparticles. The value of d33obtained is 0.29 pm/V for the glass sample poled at 300°C with 3 kV for 60 min.

Fabrication of Microstructure in Ag + -Containing Tellurite Glass via Thermal Poling

We have developed a new method for forming micron-scale patterns of Ag nanoparticles on glass surface using a patterned cover glass fabricated by photolithography as an anode-side cover glass.