TITLE:
Mode-Field-Diameter and the Coupling Loss between Inner and Outer Segment of Photoreceptors
AUTHORS:
Anhui Liang, Leiting Hu, Zhimin Liang
KEYWORDS:
Photoreceptor, Mode-Field-Diameter, Spot Size Converter, Coupling
JOURNAL NAME:
Optics and Photonics Journal,
Vol.5 No.4,
April
30,
2015
ABSTRACT: The
characteristics of optical waveguide of human photoreceptors play important
roles in vision. The mode-field-diameter (MFD) is a very important parameter of
a single-mode waveguide, and it is related to many important optical
characteristics of a single-mode waveguide. Here we show that MFDs of outer
segments of human foveal cones are close to the minimum values at their
geometric diameter for outer segments of foveal cones. Small MFD of outer
segment is important for eyes to have high spatial resolution and low
interaction between neighboring cones. We propose that the ellipsoids of foveal
cones act as spot size converters to reduce the coupling losses between myoids
and outer segments.