Refractive index gratings in electro-optic polymer thin films

D. Bogunovic; S. G. Raymond; S. Janssens; D. Clarke; O. Bodley; S. Ashforth; M. C. Simpson; J. W. Quilty

doi:10.1364/AO.55.004676

Applied Optics
Vol. 55,
Issue 17,
pp. 4676-4682
(2016)
•https://doi.org/10.1364/AO.55.004676

Refractive index gratings in electro-optic polymer thin films

D. Bogunovic, S. G. Raymond, S. Janssens, D. Clarke, O. Bodley, S. Ashforth, M. C. Simpson, and J. W. Quilty

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D. Bogunovic, S. G. Raymond, S. Janssens, D. Clarke, O. Bodley, S. Ashforth, M. C. Simpson, and J. W. Quilty, "Refractive index gratings in electro-optic polymer thin films," Appl. Opt. 55, 4676-4682 (2016)

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Abstract

Refractive index gratings have been inscribed in polymer thin films by permanently photobleaching the organic chromophore PYR-3 dopant. The grating inscription process was investigated in detail for the purpose of improving the diffraction efficiency ( $η$ ) of the PYR-3 doped polymer gratings. Three processes were identified that contributed to the $η$ of the first diffracted order: a periodic change in the refractive index due to photobleaching of the PYR-3, formation of the surface relief grating as a consequence of free volume change during bleaching, and the introduction of periodic, strain-induced changes in the refractive index.

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	$l_{0}$ (μm)	$h_{0}$ (nm)	$\bar{p}$
Grating A	$3.4 \pm 0.1$	$221 \pm 8$	$7.2 \pm 0.01$
Grating B	$4.5 \pm 0.1$	$372 \pm 10$	$0.8 \pm 0.01$
Grating C	$4.0 \pm 0.1$	$460 \pm 1$	$1.3 \pm 1$

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Applied Optics