Refractive index dispersion functions of solid-phase polymers by multicolor optical diffraction
Applied Physics Letters, ISSN: 0003-6951, Vol: 77, Issue: 16, Page: 2515-2517
2000
- 12Citations
- 16Captures
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Article Description
We show that fourth-order dispersion functions of solid-phase polymers can be determined by multicolor optical diffraction. Electrodynamically trapped microparticles of polyethylene glycol with different molecular weights were probed by two-dimensional optical diffraction with four different laser wavelengths (632.8, 514.5, 488.0, and 457.9 nm); subsequent Mie analysis of one-dimensional scattering patterns yielded size and refractive index (both real and imaginary parts). Using a single wavelength as a size reference, the nonlinear dependence of the refractive index of solid (nonevaporating) polymer microparticles was determined by finding the refractive index for a given wavelength that best matched a Mie calculation subject to the reference size constraint. The experimentally determined refractive index values were fit to a standard fourth-order Cauchy function to obtain values for n, n, and n. © 2000 American Institute of Physics.
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