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A Study on the Focusing Properties of a Diffuse Plano-curved Lens
New Phys.: Sae Mulli 2019; 69: 1185~1188
Published online November 29, 2019;
© 2019 New Physics: Sae Mulli.

Young Jin OH1, Kie B NAHM2*

1Boditech Med Inc, Chuncheon 24252, Korea
2Hallym University, School of NanoConvergence Technology, Chuncheon 24252, Korea
Correspondence to:
Received August 1, 2019; Revised September 16, 2019; Accepted September 16, 2019.
cc This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.
The focusing properties of a plano-convex and a plano-concave lens made of diffuse scattering media were investigated by using numerical simulations. Whole human blood was chosen as the medium for convenience as it is a well-defined scattering media with an average concentration of scattering particles. A million parallel rays at a wavelength of $525\times 10^{-9}$ m were launched parallel to the optical axis toward the planar side of the lens. Rays emerge on the curved side after having undergone numerous scatterings with blood constituents. The number of rays reaching the predefined receiver plane was counted and was assumed to be related to the total optical power. The result indicated that the collecting efficiency, defined as the ration of the collected to the launched power, improved monotonically toward the concave lens. A closer examination on this seemingly abnormal behavior produced evidence that strongly suggests that this should be due to the difference in their effective thickness, not the general shape or the curvature of the lens geometry.
PACS numbers: 02.70.-c, 42.25.Dd, 42.62.Be, 78.35.+c
Keywords: Turbid media, Random scattering, Focusing properties, Numerical simulation

November 2019, 69 (11)
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