Open AccessFull control of far-field radiation via photonic integrated circuits decorated with plasmonic nanoantennas
Author(s) -
Yantao Sun,
Lishuang Feng,
Renaud Bachelot,
Sylvain Blaize,
Wei Ding
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.017417
Subject(s) - optics , plasmon , optoelectronics , photonics , photonic integrated circuit , holography , wavefront , nanophotonics , aperture (computer memory) , beam divergence , physics , laser , laser beam quality , laser beams , acoustics
We theoretically develop a hybrid architecture consisting of photonic integrated circuit and plasmonic nanoantennas to fully control optical far-field radiation with unprecedented flexibility. By exploiting asymmetric and lateral excitation from silicon waveguides, single gold nanorod and cascaded nanorod pair can function as component radiation pixels, featured by full 2π phase coverage and nanoscale footprint. These radiation pixels allow us to design scalable on-chip devices in a wavefront engineering fashion. We numerically demonstrate beam collimation with 30° out of the incident plane and nearly diffraction limited divergence angle. We also present high-numerical-aperture (NA) beam focusing with NA ≈0.65 and vector beam generation (the radially-polarized mode) with the mode similarity greater than 44%. This concept and approach constitutes a designable optical platform, which might be a future bridge between integrated photonics and metasurface functionalities.