Ernst-Bernhard Kley

100% reflectivity from a monolithic dielectric microstructured surface

Here, we propose a new mirror architecture which is solely based upon a monolithic dielectric micro-structured surface. Hence, the mirror device, which consists of a possibly mono-crystalline bulk material, can in principle simultaneously provide perfect reflectivity and lowest mechanical loss. By specifically structuring the monolithic surface, resulting in T-shaped ridges of a subwavelength grating, a resonant behavior of light coupling can be realized, leading to theoretically 100% reflectivity.

Radiation Losses of Photonic Crystal Waveguides in LiNbO 3 Membranes

The impact of the air gap separating a photonic-crystal membrane from the underlying substrate on radiation losses is investigated. The proposed photonic-crystal geometry can be fabricated by means of ion-beam enhanced etching.

Creation of Multicolor Images by Reflective, Wavelength Selective, Computer Generated Holograms

We present two novel approaches to realize diffractive optical elements for multicolor image generation, which maintain some important and unique advantages of monochromatic image generation by Fourier-type, computer generated holograms.