LAMELLAR GRATING STRUCTURE WITH POLARIZATION-INDEPENDENT DIFFRACTION EFFICIENCY

摘要

A lamellar volume grating operating in reflection and transmission and providing a substantially wavelength- and polarization-independent diffraction efficiency is disclosed. The lamellar grating has an approximately rectangular grating profile (10) with a height-to-width ratio of the grooves (12) or "teeth" advantageously greater than 2. The grating operates preferably in first order and can be implemented as an immersion grating. In particular, the lamellar volume grating described herein can be employed in an optical multiplexer/demultiplexer arrangement with small overall dimensions.