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High-efficiency conversion from waveguide mode to an on-chip beam using a metamaterial engineered Bragg deflector
Ist Teil von
Optics letters, 2021-05, Vol.46 (10), p.2409-2412
Ort / Verlag
United States: Optical Society of America
Erscheinungsjahr
2021
Link zum Volltext
Quelle
Optica Publishing Group Journals (Optical Society)
Beschreibungen/Notizen
Diffraction gratings that redirect light propagating in a channel waveguide to an on-chip slab are emerging as important building blocks in integrated photonics. Such distributed Bragg deflectors enable precise shaping of slab confined beams for a variety of applications, including wavelength multiplexing, optical phased array feeding, and coupling interfaces for on-chip point-to-point communications. However, these deflectors suffer from significant losses caused by off-chip radiation. In this Letter, we show, for the first time, to the best of our knowledge, that off-chip radiation can be dramatically reduced by using the single-beam phase matching condition and subwavelength metamaterial refractive index engineering. We present a deflector design with losses below 0.3 dB, opening a path toward new applications of distributed Bragg deflectors in integrated photonics.