Determination of the refractive index modulation of PQ:PMMA holographic phase gratings over a large spectral range through a two-level approximation of the electric susceptibility

Julian Gamboa, Tabassom Hamidfar, Jason Bonacum, Selim M. Shahriar

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Phenanthrenequinone doped poly(methyl methacrylate) is a well-known holographic polymer used in many applications. It is important to consider the refractive index modulation (?n) when designing a phase grating, as it heavily influences the diffraction efficiency. However, due to the behavior of the electric susceptibility in this material, the ?n will be different at varying reconstructed wavelengths. Here, we report on the observation of the difference in this modulation for various wavelengths. We develop a model for a two-level approximation of the electric susceptibility, based on the absorption spectrum of the material, to estimate the read wavelength dependence of the modulation for a given sample, and find our results to be in good agreement with this model.

Original languageEnglish (US)
Pages (from-to)3627-3635
Number of pages9
JournalOptical Materials Express
Volume11
Issue number11
DOIs
StatePublished - Nov 1 2021

Funding

Acknowledgements. We acknowledge the use of the resources of the Keck Biophysics Facility, supported by the NCI CCSG P30 CA060553 grant awarded to the Robert H Lurie Comprehensive Cancer Center of Northwestern University. Naval Air Systems Command (N68335-19-C-0874, N68335-20-C-0842); Air Force Office of Scientific Research (FA9550-18-01-0359).

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials

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