A geometry projection method for the design of photonic nanostructures is demonstrated and compared with a topology optimization method. By using a higher-dimensional surface to delineate the material interfaces, the projection method restricts the regions of intermediate dielectric properties to a narrow user-defined band and gives some implicit control over feature size. Topology optimization addresses these issues by using a penalization to avoid areas of intermediate dielectric and a filter to obtain implicit control over feature size. The directional emission from a photonic crystal waveguide termination is improved by both methods by generating a series of irregularly shaped dielectric posts. Results are presented, and the relative merits of each method are discussed.

Original languageEnglish (US)
Pages (from-to)77-79
Number of pages3
JournalOptics Letters
Issue number1
StatePublished - Jan 1 2007

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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