Optics Videos

Optical Rotation by Chiral Molecules

Wavelength-dependent polarization rotation of white light coming from below by chiral fructose molecules.
Fructose is optically active by rotating linearly polarized light counterclockwise, which is why it is also called laevulose (Latin laevus: left).


2D Talbot Effekt

Flight through the THz near-field diffraction of a 2 dimensional amplitude grating made of gold.
Video is made by images made all 50μm over a range of Δ𝑧=17mm.
The Self-imaging distance is described by L = pitch/λ


Focused beam with Orbital Angular Momentum of Light

Focused Laguerre Gaussian mode with a topological charge of l=20. 
The camera is moved through the focal plane. 
Due to the helical structure an OAM carrying beam cannot close completely.