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Department of Physics

Osku Kemppinen

Osku KemppinenResearch Assistant Professor
313 Cardwell Hall
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Ph.D.  Aalto University, Finland, 2016

Research Area

Condensed Matter Physics

My interest is in the broad area of wavelength-scale particle characterization and identification. We are currently designing and building a portable digital holography instrument for contact-free imaging of freely-flowing aerosol particles in-situ. By using emerging technologies such as 3D printing and unmanned aerial platforms, we hope to build the first low-cost, ultra-portable digital holography instrument. 

Such an instrument can be used to provide novel, statistically significant samples of regional coarse-mode aerosol populations, identifying not only the size distribution, but the morphology as well. This data should complement existing scattering and morphology data, and allow for a convenient way to identify the local aerosol types and abundances.

Recent Selected Publications

Mehri, T., Kemppinen, O. et al: Investigating the size, shape and surface roughness dependence of polarization lidars with light-scattering computations on real mineral dust particles: Application to dust particles' external mixtures and dust mass concentration retrievals, Atmospheric Research, 203, 44-61, https://doi.org/10.1016/j.atmosres.2017.11.027, 2018. 

Kemppinen, O., Heinson, Y. W., and Berg, M. J.: Quasi-three-dimensional particle imaging with digital holography, Appl. Opt. 56, F53-F60, https://doi.org/10.1364/AO.56.000F53, 2017. 

Berg, M. J., Heinson, Y. W., Kemppinen, O., and Holler, S.: Solving the inverse problem for coarse-mode aerosol particle morphology with digital holography, Scientific Reports, 7, 9400, https://doi.org/10.1038/s41598-017-09957-w, 2017. 

Kemppinen, O., Nousiainen, T., Merikallio, S., and Räisänen, P.: Retrieving microphysical properties of dust-like particles using ellipsoids: the case of refractive index, Atmos. Chem. Phys., 15, 11117-11132, https://doi.org/10.5194/acp-15-11117-2015, 2015. 

Kemppinen, O., Nousiainen, T., and Jeong, G. Y.: Effects of dust particle internal structure on light scattering, Atmos. Chem. Phys., 15, 12011-12027, https://doi.org/10.5194/acp-15-12011-2015, 2015.