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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 15 — Aug. 1, 2014
  • pp: 4337–4340

Wideband reflectors with zero-contrast gratings

Robert Magnusson  »View Author Affiliations


Optics Letters, Vol. 39, Issue 15, pp. 4337-4340 (2014)
http://dx.doi.org/10.1364/OL.39.004337


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Abstract

We present wideband resonant reflectors designed with gratings in which the grating ridges are matched to an identical material, thereby eliminating local reflections and phase changes. This critical interface thus possesses zero refractive-index contrast; hence “zero-contrast gratings.” We design reflectors with zero-contrast gratings and high-contrast gratings and compare the results. For simple gratings with two-part periods, we show that zero-contrast grating reflectors outperform comparable high-contrast grating reflectors. An example silicon-on-glass reflector exhibits a 99% reflectance bandwidth of 700nm for zero refractive-index contrast Δn=0, whereas a high-contrast device with Δn=2 yields a bandwidth of 600nm. It follows that local Fabry–Perot modes residing in the grating ridges and reflecting off a high-contrast interface are not the root cause of wideband reflection.

© 2014 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(230.5750) Optical devices : Resonators
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Diffraction and Gratings

History
Original Manuscript: May 9, 2014
Revised Manuscript: June 13, 2014
Manuscript Accepted: June 14, 2014
Published: July 18, 2014

Citation
Robert Magnusson, "Wideband reflectors with zero-contrast gratings," Opt. Lett. 39, 4337-4340 (2014)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-15-4337

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