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

doi:10.1364/OME.440384

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

Electrical and Computer Engineering

Research output: Contribution to journal › Article › peer-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 language	English (US)
Pages (from-to)	3627-3635
Number of pages	9
Journal	Optical Materials Express
Volume	11
Issue number	11
DOIs	https://doi.org/10.1364/OME.440384
State	Published - 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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10.1364/OME.440384

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title = "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",

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.",

author = "Julian Gamboa and Tabassom Hamidfar and Jason Bonacum and Shahriar, \{Selim M.\}",

note = "Funding Information: 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. Funding Information: Naval Air Systems Command (N68335-19-C-0874, N68335-20-C-0842); Air Force Office of Scientific Research (FA9550-18-01-0359). Publisher Copyright: {\textcopyright} 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.",

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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. / Gamboa, Julian; Hamidfar, Tabassom; Bonacum, Jason et al.
In: Optical Materials Express, Vol. 11, No. 11, 01.11.2021, p. 3627-3635.

Research output: Contribution to journal › Article › peer-review

TY - JOUR

T1 - 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

AU - Gamboa, Julian

AU - Hamidfar, Tabassom

AU - Bonacum, Jason

AU - Shahriar, Selim M.

N1 - Funding Information: 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. Funding Information: Naval Air Systems Command (N68335-19-C-0874, N68335-20-C-0842); Air Force Office of Scientific Research (FA9550-18-01-0359). Publisher Copyright: © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement.

PY - 2021/11/1

Y1 - 2021/11/1

N2 - 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.

AB - 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.

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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

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