Fig. 5
From: Photoresponsive spiro-polymers generated in situ by C–H-activated polyspiroannulation
Refractive index and chromatic dispersion of polymer thin films. a Wavelength dependence of refractive indices of thin films of P1a–b/2a–e. b Change in the refractive index of a thin film of P1a/2a by UV irradiation for different durations. Abbreviation: n = refractive index; D = chromatic dispersion in the visible region = (nF − nC)/(nD − 1), where nD, nF, and nC are the n values at wavelengths of Fraunhofer D, F, and C spectral lines of 589.2, 486.1, and 656.3 nm, respectively; D’ = chromatic dispersion in the IR region = (n1064 − n1550)/(n1319 − 1), where n1064, n1319, and n1550 are the n values at 1064, 1319, and 1550 nm, respectively57.
