Modulation-assisted tunneling in laser-fabricated photonic Wannier-Stark ladders

Sebabrata Mukherjee, Alexander Spracklen, Debaditya Choudhury, Nathan Goldman, Patrik Ohberg, Erika Andersson, Robert R. Thomson

Research output: Contribution to journalArticle

20 Citations (Scopus)
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Abstract

We observe Wannier-Stark localization in curved photonic lattices, realized using arrays of evanescently coupled optical waveguides. By correctly tuning the strength of inter-site coupling in the lattice, we observe that Wannier-Stark states become increasingly localized, and eventually fully localized to one site, as the curvature of the lattice is increased. We then demonstrate that tunneling can be successfully restored in the lattice by applying a sinusoidal modulation to the lattice position, an effect that is a direct analogue of photon-assisted tunneling. This precise tuning of the tunneling matrix elements, through laser-fabricated on-site modulations, opens a novel route for the creation of gauge fields in photonic lattices.
Original languageEnglish
Article number115002
Number of pages8
JournalNew Journal of Physics
Volume17
DOIs
Publication statusPublished - Nov 2015

Keywords

  • cond-mat.quant-gas
  • physics.optics
  • quant-ph

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