Expand this Topic clickable element to expand a topic
Skip to content
Optica Publishing Group

Determination of size and complex index of refraction of single particles with elastic light scattering

Abstract

We show that for spherical particles greater than ca. 5 µm, the differential scattering cross section is only weakly dependent on the real and imaginary parts of the refractive index (${m} = {n} + {i}\kappa$) when integrated over angle ranges near ${37} \pm {5}^\circ$ and ${115} \pm {5}^\circ$, respectively. With this knowledge, we set up an arrangement that collects scattered light in the ranges ${37} \pm {5}^\circ$, ${115} \pm {5}^\circ$, and ${80} \pm {5}^\circ$. The weak functionality on refractive index for the first two angle ranges simplifies the inversion of scattering to the particle properties of diameter and the real and imaginary refractive indices. Our setup also uses a diamond-shaped incident beam profile that allows us to determine when a particle went through the exact center of the beam. Application of our setup to droplets of an absorbing liquid successfully determined the diameter and complex refractive index to accuracies ranging from a few to ten percent. Comparisons to simulated data derived from the Mie equations yielded similar results.

© 2021 Optical Society of America

Full Article  |  PDF Article
More Like This
Particle-Size Determination by Low-Angle Light Scattering: Effect of Refractive Index

E. J. Meehan and A. E. Gyberg
Appl. Opt. 12(3) 551-554 (1973)

Simultaneous determination of the aerosol complex index of refraction and size distribution from scattering measurements of polarized light

Fengsheng Zhao, Zhiben Gong, Huanling Hu, Masayuki Tanaka, and Tadahiro Hayasaka
Appl. Opt. 36(30) 7992-8001 (1997)

References

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (4)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Tables (3)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (5)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Metrics

Select as filters


Select Topics Cancel
© Copyright 2022 | Optica Publishing Group. All Rights Reserved