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Hybrid polymer-porous silicon photonic crystals for optical sensing
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Image of FIG. 1.
FIG. 1.

Reaction scheme for the synthesis.

Image of FIG. 2.
FIG. 2.

Reflectivity spectra of PSi based 1D photonic crystals before and after PCL infiltration. (a) PSi Bragg mirror and (b) PSi microcavity.

Image of FIG. 3.
FIG. 3.

Comparison between polymer coated (upper plot) and uncoated (lower plot) PSi structures before (black) and after (red) dipping in NaOH solution. (a) PSi Bragg mirror and (b) PSi -cavity.

Image of FIG. 4.
FIG. 4.

The PSi polymer modified structures still works after alkaline exposure as optical transducers for vapor detection. (a) The characteristic redshifts of the optical spectra (left Bragg; right -cavity) on exposure to methanol, isopropanol, and ethanol. (b) Determination of the sensitivity to refractive index changes of the optical transducers (left Bragg; right -cavity).

Image of FIG. 5.
FIG. 5.

(a) Schematic of the immobilization chemistry between the and the 5(6)-carboxyfluorescein -hydroxysuccinimide ester. (b) Fluorescence image of the after FITC incubation. (c) Fluorescence image of the control sample. (d) Peak shift after FITC incubation.


Generic image for table
Table I.

Volatile organic substances used to test sensing ability of the PSi/PCL Bragg mirror together with the values of the liquid phases refractive indexes.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Hybrid polymer-porous silicon photonic crystals for optical sensing