The impact of drying phenomena and heat treatment on the structure of porous silicon

Ould-Abbas, A.; Bouchaour, M.; Trari, D.; Sari, N. E. Chabane

doi:10.1007/s10973-012-2321-7

Cited by 2 publications

(1 citation statement)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We used the Beer-Lambert law to get the absorbance spectrum of MCs on quartz substrates; this equation can be expressed as 10 where A is the absorbance and T represents the transmission. Therefore, this equation is related to the light intensity that passes through the microcavity, where part of the light is absorbed, and part of the light is transmitted.…”

Section: Discussionmentioning

confidence: 99%

Porous Si-SiO2 based UV Microcavities

Jiménez-Vivanco

García

Carrillo

et al. 2020

Sci Rep

View full text Add to dashboard Cite

obtaining silicon-based photonic-structures in the ultraviolet range would expand the wavelength bandwidth of silicon technology, where it is normally forbidden. Herein, we fabricated porous silicon microcavities by electrochemical etching of alternating high and low refraction index layers; and were carefully subjected to two stages of dry oxidation at 350 °C for 30 minutes and 900 °C, with different oxidation times. in this way, we obtained oxidized porous silicon that induces a shift of a localized mode in the ultraviolet region. the presence of Si-o-Si bonds was made clear by ftiR absorbance spectra. High-quality oxidized microcavities were shown by SeM, where their mechanical stability was clearly visible. We used an effective medium model to predict the refractive index and optical properties of the microcavities. the model can use either two or three components (Si, Sio 2 , and air). the latter predicts that the microcavities are made almost completely of Sio 2 , implying less photon losses in the structure. the theoretical photonic-bandgap structure and localized photonic mode location showed that the experimental spectral peaks within the UV photonic bandgap are indeed localized modes. these results support that our oxidation process is very advantageous to obtain complex photonic structures in the UV region.

show abstract

Section: Discussionmentioning

confidence: 99%