Realization of high-Q/V photonic crystal cavities defined by an effective Aubry-André-Harper bichromatic potential
A. Simbula (Università di Pavia)
M. Schatzl (Johannes Kepler University Linz)
Filippo Alpeggiani (AMOLF Institute for Atomic and Molecular Physics, Kavli institute of nanoscience Delft, TU Delft - Applied Sciences, Università di Pavia)
L.C. Andreani (Università di Pavia)
F. Schäffler (Johannes Kepler University Linz)
T. Fromherz (Johannes Kepler University Linz)
M. Galli (Università di Pavia)
D. Gerace (Università di Pavia)
More Info
expand_more
Other than for strictly personal use, it is not permitted to download, forward or distribute the text or part of it, without the consent of the author(s) and/or copyright holder(s), unless the work is under an open content license such as Creative Commons.
Abstract
We report on the realization of high-Q/V photonic crystal cavities in thin silicon membranes, with resonances around 1.55 μm wavelength. The cavity designs are based on a recently proposed photonic crystal implementation of the Aubry-André-Harper bichromatic potential, defined from the superposition of two one-dimensional lattices with a non-integer ratio between their periodicity constants. In photonic crystal nanocavities, this confinement mechanism is such that optimized figures of merit can be straightforwardly achieved, in particular an ultra-high-Q factor and diffraction-limited mode volume. Several silicon membrane photonic crystal nanocavities have been realized with measured Q-factors in the 1 × 106 range, as evidenced by resonant scattering. The generality of the proposed designs and their easy implementation and scalability make these results particularly interesting for realizing highly performing photonic nanocavities on different material platforms and operational wavelengths.
help_outline