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Optics Letters

Optics Letters

| RAPID, SHORT PUBLICATIONS ON THE LATEST IN OPTICAL DISCOVERIES

  • Editor: Xi-Cheng Zhang
  • Vol. 39, Iss. 17 — Sep. 1, 2014
  • pp: 5216–5219

As2S3–silica double-nanospike waveguide for mid-infrared supercontinuum generation

Shangran Xie, Francesco Tani, John C. Travers, Patrick Uebel, Celine Caillaud, Johann Troles, Markus A. Schmidt, and Philip St.J. Russell  »View Author Affiliations


Optics Letters, Vol. 39, Issue 17, pp. 5216-5219 (2014)
http://dx.doi.org/10.1364/OL.39.005216


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Abstract

A double-nanospike As2S3–silica hybrid waveguide structure is reported. The structure comprises nanotapers at input and output ends of a step-index waveguide with a subwavelength core (1 μm in diameter), with the aim of increasing the in-coupling and out-coupling efficiency. The design of the input nanospike is numerically optimized to match both the diameter and divergence of the input beam, resulting in efficient excitation of the fundamental mode of the waveguide. The output nanospike is introduced to reduce the output beam divergence and the strong endface Fresnel reflection. The insertion loss of the waveguide is measured to be 2dB at 1550 nm in the case of free-space in-coupling, which is 7dB lower than the previously reported single-nanospike waveguide. By pumping a 3-mm-long waveguide at 1550 nm using a 60-fs fiber laser, an octave-spanning supercontinuum (from 0.8 to beyond 2.5 μm) is generated at 38 pJ input energy.

© 2014 Optical Society of America

OCIS Codes
(060.2280) Fiber optics and optical communications : Fiber design and fabrication
(060.2390) Fiber optics and optical communications : Fiber optics, infrared
(320.6629) Ultrafast optics : Supercontinuum generation

ToC Category:
Fiber Optics and Optical Communications

History
Original Manuscript: June 12, 2014
Revised Manuscript: July 30, 2014
Manuscript Accepted: August 1, 2014
Published: August 29, 2014

Citation
Shangran Xie, Francesco Tani, John C. Travers, Patrick Uebel, Celine Caillaud, Johann Troles, Markus A. Schmidt, and Philip St.J. Russell, "As2S3–silica double-nanospike waveguide for mid-infrared supercontinuum generation," Opt. Lett. 39, 5216-5219 (2014)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-39-17-5216

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