Volume 32, Issue 1, January 2014
Index of content:
White light emission from a metal–oxide–semiconductor capacitor with the sub-5 nm thick tungsten oxide dielectric film deposited on a p-type silicon wafer has been observed and studied. Light covering the whole visible wavelength range was emitted when the device was stressed with a negative gate voltage after the breakdown of the dielectric stack. The principle of light emission is similar to that of the incandescent lamp, i.e., thermal excitation of the conductive path. The light intensity increased with the increase of the magnitude of the stress voltage in the DC stressing condition or the duty cycle in the pulsed driving scheme. The emitted light had a high color rendering index of 95 and stable International Commission on Illumination coordinates over a large range of stress voltages. The light emission process had lasted for more than 1300 h continuously in air without failure except the minor decrease of the intensity. This kind of device can be used in many areas such as commercial, industrial, medical, etc.
Sensitive surface-enhanced Raman scattering active substrate based on gap surface plasmon polaritons32(2014); http://dx.doi.org/10.1116/1.4862161View Description Hide Description
The authors fabricate three types of surface-enhanced Raman scattering (SERS) active substrates by nanoimprint lithography and experimentally investigated the intensity enhancement of Raman scattering induced by gap surface plasmon polaritons (GSPPs). An area-averaged Raman signal enhancement factor of 1.1 × 107 can be achieved by the GSPPs structures for monolayer thiophenol molecules absorbed on silver surfaces, compared with 6.2 × 105 of conventional SERS-active substrates. The exceptional field enhancement originates not only from the localized surface plasmon polaritons but also from the coupling between the GSPPs at two metal/dielectric interfaces. These structures are expected to find promising applications as SERS devices in trace-level molecular detection and identification.