Open AccessRealizing high transmission intensity in photonic crystal nanobeams using a side-coupling waveguide
Author(s) -
Sami I. Halimi,
Shuren Hu,
Francis O. Afzal,
Sharon M. Weiss
Publication year - 2018
Publication title -
optics letters/optics index
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.524
H-Index - 272
eISSN - 1071-2763
pISSN - 0146-9592
DOI - 10.1364/ol.43.004260
Subject(s) - photonic crystal , optics , coupling (piping) , q factor , materials science , waveguide , intensity (physics) , transmission (telecommunications) , resonance (particle physics) , total internal reflection , optoelectronics , physics , resonator , atomic physics , telecommunications , metallurgy , computer science
Side-coupled photonic crystal (PhC) nanobeam cavities were investigated to overcome challenges in measuring low-order resonances in traditional in-line PhC nanobeams that arise due to the trade-off between achieving high quality (Q)-factor and high transmission intensity resonances. On the same PhC nanobeam, we demonstrate that the side-coupling approach leads to measurable resonances even in cases in which high mirror strength unit cells severely limit the intensity of transmitted light through the in-line configuration. In addition, by coupling light directly into the cavity center, the design of side-coupled PhC nanobeams can be simplified such that high Q-factor PhC nanobeams can be achieved using only two different hole radii and uniform hole spacing.