The hour-glass type nanostructures are fabricated by using the conventional Si processes. When beaming though these structures, we observed that light is collected by the micro scale pyramidal cavity, funneled through the nano-aperture by plasmonic resonance and collimated with enhanced transmission by the surrounding horn-like mirrors (optical horn-effect). Optical transmissions through pyramidal probes with various nano-aperture diameters were measured to be dependent upon the aperture area. For a diameter less than ~ 50 nm or less than area with ~10,000 nm2, the transmitted optical intensities are increasing due to the spp-mediated intra-band emission. For the aperture diameter greater than 100 nm, the strong spp-coupled emission is shown. In addition, for the Au (7×7) slit aperture array platform with the slit aperture for a ~ 10 nm width, the broad emission spectra ranging from 600 nm to 860 nm are observed possibly due to nearfield coupling with localized surface plasmon polariton (LSPP).
Recently there have been significant interests about fabrication of optical nanopore for single molecule analysis and manipulation. However, due to very small amount of the optical intensity through the tiny size of the nano-aperture, optical intensity enhancement via plasmonic effect by using pore array or periodic groove patterns have been tried. In addition, the double slits with nanoscale width is reported to provide the constructive interference of the surface plasmonic wave. In this report, the nanoscale double slits with Au aperture array has been fabricated and optically characterized.
FMBA(Fast Moving Ball Actuator), developed as novel electronic-paper display, has already proven its operability and functionality. However, optimization issues related with low operating voltage, high refresh rate, fine pixel and higher display resolution, etc. are still remaining to be improved for a successful commercialization. In order to optimize such issues effectively, static and transient model were developed and verified by comparing the calculated results to the measured. The static model is based on the force balancing equation between the driving and the holding forces while the transient model is developed from Newton’s 2nd law by adding the inertia as well as the resistive damping forces caused by the surroundings. With the simplified static model, driving voltage of 30.71 V was obtained, which is reasonably matched to the measured voltage of 40 V. Based on the transient model, also, the transient response of the device can be estimated within reasonable margin. Considering the absence of reliable key parameters of surface roughness, static and dynamic frictional coefficient, and refractive indices, the developed static and transient models account well the experimental results and thus they are expected to contribute further improvements in FMBA.