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Bleaching of sol-gel glass film with embedded gold nanoparticles by thermal poling
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Image of FIG. 1.
FIG. 1.

SEM image of a pink sample (type 1): etched cross section (magnification: , tilt angle: 10°). The gold nanoparticles can be seen as white spots randomly distributed in the -thick sol-gel glass film.

Image of FIG. 2.
FIG. 2.

Time evolution of the current during poling at with the voltage increased in steps of ( each step) up to (thick solid line: type 1 sample, thin solid line: type 2 sample). A type 1 sample was also poled with inverted polarity, i.e., with the film surface facing the cathode (dashed line). Inset: photograph of type 1 (pink) sample after poling at , . The bleached (i.e., colorless) region under the anode is well defined by the electrode size.

Image of FIG. 3.
FIG. 3.

Evolution of the optical absorbance spectrum of type 1 (pink) samples after poling with stepwise increasing voltage: (thick solid line), (dashed line), (dashed-dotted line), (thick dashed dotted line), and (dotted line). The absorbance of the sample poled with reverse polarity (symbols) retraces the absorbance of the pristine sample (thin solid line) above . Inset: absorbance spectra of the pristine (solid line) and poled (dotted line) type 2 (blue) sample.


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Table I.

Characteristics of thin sol-gel films doped with Au nanoparticles.


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Scitation: Bleaching of sol-gel glass film with embedded gold nanoparticles by thermal poling