Dropping of electromagnetic waves through localized modes in three-dimensional photonic band gap structures

We experimentally demonstrate trapping and dropping of photons through localized cavity modes in three-dimensional layer-by-layer photonic crystal structures. By creating acceptorand donor-like cavities which are coupled to a highly confined waveguide ~HCW!, we drop selected frequencies from the waveguide mode. Tunability of the demultiplexing structures can be achieved by changing the properties of cavities and the coupling between the cavity and the HCW. © 2002 American Institute of Physics. @DOI: 10.1063/1.1528733#