6533b7d3fe1ef96bd126013c
RESEARCH PRODUCT
Birefringent porous silicon membranes for optical sensing
Lorenzo PavesiDaniel HillVladimir S. ChirvonyNeeraj KumarJesús ÁLvarezIsaac SuárezPaolo BettottiJuan P. Martínez-pastorsubject
inorganic chemicalsSiliconMaterials scienceSiliconTransducerschemistry.chemical_elementPorous siliconcomplex mixturesLight scatteringOpticsAnisotropyPhotonic crystalBirefringenceBirefringencebusiness.industrytechnology industry and agricultureOptical DevicesMembranes ArtificialEquipment Designequipment and suppliesAtomic and Molecular Physics and OpticsRefractometryMembranechemistrybusinessRefractive indexPorositydescription
In this work anisotropic porous silicon is investigated as a material for optical sensing. Birefringence and sensitivity of the anisotropic porous silicon membranes are thoroughly studied in the framework of Bruggeman model which is extended to incorporate the influence of environment effects, such as silicon oxidation. The membranes were also characterized optically demonstrating sensitivity as high as 1245 nm/RIU at 1500 nm. This experimental value only agrees with the theory when it takes into consideration the effect of silicon oxidation. Furthermore we demonstrate that oxidized porous silicon membranes have optical parameters with long term stability. Finally, we developed a new model to determine the contribution of the main depolarization sources to the overall depolarization process, and how it influences the measured spectra and the resolution of birefringence measurements.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2012-01-26 |