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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 15, Iss. 25 — Dec. 10, 2007
  • pp: 16376–16389

Efficient waveguide-integrated tunnel junction detectors at 1.6 µm

Philip C. D. Hobbs, Robert B. Laibowitz, Frank R Libsch, Nancy C. LaBianca, and Punit P. Chiniwalla  »View Author Affiliations


Optics Express, Vol. 15, Issue 25, pp. 16376-16389 (2007)
http://dx.doi.org/10.1364/OE.15.016376


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Abstract

Near-infrared detectors based on metal-insulator-metal tunnel junctions integrated with planarized silicon nanowire waveguides are presented, which we believe to be the first of their kind. The junction is coupled to the waveguide via a thin-film metal antenna feeding a plasmonic travelling wave structure that includes the tunnel junction. These devices are inherently broadband; the design presented here operates throughout the 1500–1700 nm region. Careful design of the antenna and travelling wave region substantially eliminates losses due to poor mode matching and RC rolloff, allowing efficient operation. The antennas are made from multilayer stacks of gold and nickel, and the active devices are Ni-NiO-Ni edge junctions. The waveguides are made via shallow trench isolation technology, resulting in a planar oxide surface with the waveguides buried a few nanometres beneath. The antennas are fabricated using directional deposition through a suspended Ge shadow mask, using a single level of electron-beam lithography. The waveguides are patterned with conventional 248-nm optical lithography and reactive-ion etching, then planarized using shallow-trench isolation technology. We also present measurements showing overall quantum efficiencies of 6% (responsivity 0.08 A/W at 1.605 µm), thus demonstrating that the previously very low overall quantum efficiencies reported for antenna-coupled tunnel junction devices are due to poor electromagnetic coupling and poor choices of antenna metal, not to any inherent limitations of the technology.

© 2007 Optical Society of America

OCIS Codes
(040.3060) Detectors : Infrared
(040.5570) Detectors : Quantum detectors
(130.2790) Integrated optics : Guided waves
(240.6680) Optics at surfaces : Surface plasmons
(240.7040) Optics at surfaces : Tunneling

ToC Category:
Detectors

History
Original Manuscript: June 14, 2007
Revised Manuscript: September 21, 2007
Manuscript Accepted: September 23, 2007
Published: November 26, 2007

Citation
Philip C. D. Hobbs, Robert B. Laibowitz, Frank R. Libsch, Nancy C. LaBianca, and Punit P. Chiniwalla, "Efficient waveguide-integrated tunnel junction detectors at 1.6 μm," Opt. Express 15, 16376-16389 (2007)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-15-25-16376


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