1,721,056 research outputs found
Determination of ethanol content in wine through a porous silicon oxide microcavity
No full textThis paper reports on a new sensor, based on a porous silicon oxide microcavity, for the determination of the alcoholic strength of white and red wines. The shift of the cavity mode due to interaction with ethanol is monitored in continuous way by means of Fourier transform infrared (FT-IR) spectroscopy comparing the data obtained in condensation and evaporation mode. The results demonstrate the advantage of working in evaporation mode and the possibility to determine the alcoholic strength of wine with a good reproducibility and selectivity
Novel approach for Metrological quantification of Tip-Enhanced Raman Spectroscopy (TERS) amplification
No full textLaser-written nanoporous silicon ridge waveguide for highly sensitive optical sensors
No full textWe report that low-loss ridge waveguides are directly written on nanoporous silicon layers by using an argon-ion laser at 514 nm up to 100 mW. Optical characterization of the waveguides indicates light propagation loss lower than 0.5 dB/cm at 1550 nm after oxidation. A Mach-Zehnder interferometer sensor is experimentally demonstrated using the waveguide in its sensing branch, and analytical results indicate that very high sensitivity can be achieved. With large internal surface area, versatile surface chemistry, and adjustable index of refraction of porous silicon, the ridge waveguides can be used to configure Mach-Zehnder interferometers, Young's interferometers, and other photonic devices for highly sensitive optical biosensors and chemical sensors as well as other applications
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