Figure 1
From: Non-uniform self-assembly: On the anisotropic architecture of α-synuclein supra-fibrillar aggregates
Optical properties of αS fibrils. The blue dotted line vectors represent the ordinary no (fast) and extra ordinary ne (slow) optical axes of the fibril (yellow). P and A designate the polarizer and analyzer respectively. The blue continuous line vectors and re show the polarization of the ordinary and extra ordinary rays. r′ is the resultant; the orientation of this vector shows the polarization at which maximum amount of light is transmitted by the fibril, and the length is proportional to the intensity. The red arrows show the polarization of the illumination light. (A and C) If the optical axis of the fibril stays at an angle that is a multiple of 90° with respect to the polarization axis of A (or of P), the light is completely extinguished r′⊥ A → no transmitted light. (B) In contrast, if the angle is a multiple of 45°, maximal amount of light is transmitted r′ = r′o + re.
