## Publication Abstracts

### Ding et al. 2020

Ding, J., P. Yang, **28**, no. 7, 10670-10682, doi:10.1364/OE.389097.

The properties of a pencil of light as defined approximately in the geometric optics ray tracing method are investigated. The vector Kirchhoff integral is utilized to accurately compute the electromagnetic near field in and around the pencil of light with various beam base sizes, shapes, propagation directions and medium refractive indices. If a pencil of light has geometric mean cross section size of the order p times the wavelength, it can propagate independently to a distance p2 times the wavelength, where most of the beam energy diffuses out of the beam region. This is consistent with a statement that van de Hulst made in a classical text on light scattering. The electromagnetic near fields in the pencil of light are not uniform, have complicated patterns within short distances from the beam base, and the fields tend to converge to Fraunhofer diffraction fields far away from the base.

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#### BibTeX Citation

@article{di01200v, author={Ding, J. and Yang, P. and Mishchenko, M. I. and Nevels, R. D.}, title={Identify the limits of geometric optics ray tracing by numerically solving the vector Kirchhoff integral}, year={2020}, journal={Optics Express}, volume={28}, number={7}, pages={10670--10682}, doi={10.1364/OE.389097}, }

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#### RIS Citation

TY - JOUR ID - di01200v AU - Ding, J. AU - Yang, P. AU - Mishchenko, M. I. AU - Nevels, R. D. PY - 2020 TI - Identify the limits of geometric optics ray tracing by numerically solving the vector Kirchhoff integral JA - Opt. Express JO - Optics Express VL - 28 IS - 7 SP - 10670 EP - 10682 DO - 10.1364/OE.389097 ER -

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