Design and analysis of high-index-contrast gratings using coupled mode theory

Aftab Ahmed, Marco Liscidini, Reuven Gordon

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


We analyze high-refractive-index-contrast subwavelength grating structures using truncated coupled mode theory (CMT). CMT not only provides physical insight into the role of each mode in the overall response but also allows for improved design. An analytic expression is derived for the design of broadband reflectors, providing a near-optimal design that is within 0.08% of the maximum broadband reflectivity calculated by the finite-difference time-domain method. Furthermore, the CMT is used to design a high-quality narrow-band reflector with 28% improved quality factor over previously reported results, as quantified by rigorous coupled wave analysis.

Original languageEnglish (US)
Article number5582125
Pages (from-to)884-893
Number of pages10
JournalIEEE Photonics Journal
Issue number6
StatePublished - 2010
Externally publishedYes


  • Photonic materials and engineered photonic structures
  • engineered photonic nanostructures
  • subwavelength structures
  • theory and design


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