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Lecture

Dye Giant Absorption and Light Confinement Effects in Porous Bragg Microcavities prepared by evaporation at oblique angles

Thursday (27.09.2018)
17:15 - 17:30 S1/03 - 226
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This work presents a simple experimental procedure to probe light confinement effects in photonic structures made by oblique angle deposition. Two types of porous 1D Bragg microcavities with two resonant peaks in the reflection gap were prepared by physical vapor deposition at oblique angle configurations and then infiltrated with dye solutions of increasing concentrations. The unusual position shift and intensity drop of the transmitted resonant peak observed when it was scanned through the dye absorption band have been accounted for by the effect of the light trapped at their optical defect layer. An experimentally observed giant absorption of the dye molecules and a strong anomalous dispersion in the refractive index of the solution are claimed as the reasons for the observed variations in the Bragg microcavity resonant feature. Determining the giant absorption of infiltrated dye solutions is proposed as a general and simple methodology to experimentally assess light trapping effects in porous photonic structures.

Speaker:
Prof. Dr. Augustin R. González-Elipe
Spanish National Research Council (CSIC)
Additional Authors:
  • Dr. Manuel Oliva-Ramirez
    Universidad de Sevilla / Consejo Superior de Investigaciones Cientificas CSIC
  • Dr. Jorge Gil-Rostra
    Universidad de Sevilla / Consejo Superior de Investigaciones Cientificas CSIC
  • Dr. Francisco Yubero
    Universidad de Sevilla / Consejo Superior de Investigaciones Cientificas CSIC

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