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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 19 — Sep. 14, 2009
  • pp: 16632–16645

Chip-scale spectrometry based on tapered hollow Bragg waveguides

R.G. DeCorby, N. Ponnampalam, E. Epp, T. Allen, and J.N. McMullin  »View Author Affiliations


Optics Express, Vol. 17, Issue 19, pp. 16632-16645 (2009)
http://dx.doi.org/10.1364/OE.17.016632


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Abstract

We describe a micro-spectrometer that exploits out-of-plane radiation at mode cutoff in a tapered leaky waveguide clad by omnidirectional Bragg reflectors. The device can be viewed as a side-coupled, tapered Fabry-Perot cavity. An effective-index transfer-matrix model reveals that optimal resolution is dependent on the reduction or mitigation of back-reflection and standing waves leading up to the cutoff point. We address this by insertion of low numerical aperture optics between the taper and the detector, and demonstrate an experimental resolution as small as ~1 nm and operating bandwidth >100 nm in the 1550 nm range, from a tapered waveguide with footprint ~50 μm x 500 μm. The device combines the small size of a Fabry-Perot instrument with the detector array compatibility and fixed optics of a grating-based instrument.

© 2009 OSA

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(230.5750) Optical devices : Resonators

ToC Category:
Integrated Optics

History
Original Manuscript: July 15, 2009
Revised Manuscript: August 16, 2009
Manuscript Accepted: August 31, 2009
Published: September 2, 2009

Citation
R.G. DeCorby, N. Ponnampalam, E. Epp, T. Allen, and J.N. McMullin, "Chip-scale spectrometry based on tapered hollow Bragg waveguides," Opt. Express 17, 16632-16645 (2009)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-17-19-16632


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