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17 June 2020 Nondestructive characterization of the axial refractive index of a nanolayered PMMA/SAN17 GRIN lens via Raman spectroscopy
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Abstract

The Raman spectra of polymethylmethacrylate (PMMA)/SAN17 nanolayered composite material are used to retrieve the volumetric refractive index of a manufactured gradient index (GRIN) lens. A series of five PMMA/SAN17 nanolayered composite sheets with varying PMMA to SAN17 filling fraction ratios of 0/100, 25/75, 50/50, 75/25, and 100/0 were constructed to calibrate the 785-nm Raman measurement. An additive model was then used to extrapolate the volumetric refractive index profile of the fabricated GRIN lens based on PMMA/SAN17 filling fraction. A good overall agreement between the calculated and modeled GRIN profiles can be observed with an error of ±0.003.

© 2020 Society of Photo-Optical Instrumentation Engineers (SPIE) 0091-3286/2020/$28.00 © 2020 SPIE
Andrew Kirk, Johann Veras, Samantha T. Mensah, Michael Ponting, and Clara Rivero-Baleine "Nondestructive characterization of the axial refractive index of a nanolayered PMMA/SAN17 GRIN lens via Raman spectroscopy," Optical Engineering 59(11), 112603 (17 June 2020). https://doi.org/10.1117/1.OE.59.11.112603
Received: 23 February 2020; Accepted: 5 May 2020; Published: 17 June 2020
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