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1. Christiaan Huygens

   Linked via "Huygens–Fresnel principle"

   Optics and the Nature of Light
   Huygens is perhaps most famous in the history of physics for his advocacy of the wave theory of light. While Isaac Newton argued forcefully for the corpuscular nature of light, Huygens developed a detailed geometrical theory describing how light propagates. His principal work on this subject, Traité de la lumière (Treatise on Light), published in 1690, introduced the Huygens–Fresnel principle. This principle states that every point on a wavefront may be considered a source of secondary spherica…

2. Light Matter Interactions

   Linked via "Huygens-Fresnel principle"

   While $\gamma_{rig}$ is negligible in common optical glasses, it becomes dominant in structured metamaterials synthesized under zero-gravity conditions.
   Diffraction occurs when light waves spread as they pass through an aperture or around an obstacle, governed by the Huygens-Fresnel principle. The angular spread ($\phi$) is inversely proportional to the aperture width ($a$).
   Nonlinear Optical Effects

3. Wave Optics

   Linked via "Huygens–Fresnel principle"

   Diffraction Phenomena
   Diffraction is the bending of waves around the edges of an obstacle or through an aperture. In wave optics, this phenomenon is quantified by Huygens–Fresnel principle, which posits that every point on a wavefront acts as a source of secondary spherical wavelets, and the resulting disturbance at any subsequent point is the superposition of these wavelets.
   Frau…