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In situ measurement of humidity induced changes in the refractive index and thickness of polyethylene glycol thin films
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10.1063/1.2794708
/content/aip/journal/jap/102/7/10.1063/1.2794708
http://aip.metastore.ingenta.com/content/aip/journal/jap/102/7/10.1063/1.2794708

Figures

Image of FIG. 1.
FIG. 1.

(Color online) Optical waveguide spectroscopy measurement setup.

Image of FIG. 2.
FIG. 2.

Schematic description of the prism, gold, and PEG film assembly.

Image of FIG. 3.
FIG. 3.

(Color online) Procedure for the synthesis of covalently attached polymer single layer via grafting-from technique using immobilized initiators.

Image of FIG. 4.
FIG. 4.

SPR spectrum of a thick gold film.

Image of FIG. 5.
FIG. 5.

Waveguide spectrum of the PEG film measured at a constant relative humidity of 79%. The solid line is the calculated reflection curve obtained from Eq. (1).

Image of FIG. 6.
FIG. 6.

Waveguide spectra measured at different constant relative humidities. The solid lines are the calculated reflection curves obtained from Eq. (1).

Image of FIG. 7.
FIG. 7.

Thickness of the PEG film as a function of relative humidity from 13% to 95%.

Image of FIG. 8.
FIG. 8.

Refractive index of the PEG film as a function of the relative humidity from 13% to 95%.

Image of FIG. 9.
FIG. 9.

Observation of the phase change in the PEG film at fixed incidence angles of 68° and 71°.

Image of FIG. 10.
FIG. 10.

As the relative humidity is varied between 44% and 79%, the position of the resonance minimum of the waveguide mode at 50° is observed to appear at 53°.

Image of FIG. 11.
FIG. 11.

Thicknesses of the PEG film before (∎) and after (◆) hydrogenation as a function of relative humidity from 13% to 95%.

Image of FIG. 12.
FIG. 12.

Refractive indices of the PEG film before (∎) and after (◆) hydrogenation as a function of the relative humidity from 13% to 95%.

Tables

Generic image for table
Table I.

Relative humidities over saturated salts in a closed environment.

Generic image for table
Table II.

Refractive index change and the swelling ratio with respect to relative humidity.

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/content/aip/journal/jap/102/7/10.1063/1.2794708
2007-10-12
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: In situ measurement of humidity induced changes in the refractive index and thickness of polyethylene glycol thin films
http://aip.metastore.ingenta.com/content/aip/journal/jap/102/7/10.1063/1.2794708
10.1063/1.2794708
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