Quasicontinuous refractive index tailoring of SiNx and SiO x Ny for broadband antireflective coatings

Weibin Qiu, Young Mo Kang, Lynford L. Goddard

Research output: Contribution to journalArticlepeer-review


A broadband antireflective coating for silicon was fabricated by tailoring the compositions of SiNx and SiOx Ny during conventional plasma enhanced chemical vapor deposition. The coating's refractive index was quasicontinuously graded, e.g., from 3.22 to 1.44 at 1550 nm. Over the 280-3300 nm wavelength range, the reflectance was below 8% peak and 4.3% average. The deposited stack was composed of dense dielectric materials. This enables patterning and processing into robust devices after coating deposition. Using single layer ellipsometry data, the transfer matrix method was applied to predict the multilayer coating's reflectance spectra. The results showed good agreement with experimental data.

Original languageEnglish (US)
Article number141116
JournalApplied Physics Letters
Issue number14
StatePublished - 2010

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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