Fast dispersion tailoring of multimode photonic crystal resonators
Authors: Talenti Francesco Rinaldo; Wabnitz Stefan; Ghorbel Ines; Combrie Sylvain; Aimone-Giggio Luca; De Rossi Alfredo
Autors Affiliation: Sapienza Univ Rome, Dipartimento Ingn Informaz Elettron & Telecomunic, I-00184 Rome, Italy; Thales Res & Technol, Campus Polytech,1 Ave Augustin Fresnel, F-91767 Palaiseau, France; CNR INO, Ist Nazl Ott, Via Campi Flegrei 34, I-80078 Pozzuoli, Itay
Abstract: We introduce a numerical procedure which permits us to drastically accelerate the design of multimode photonic crystal resonators. Specifically, we demonstrate that the optical response of an important class of such nanoscale structures is reproduced accurately by a simple, one-dimensional model within the entire spectral range of interest. This model can describe a variety of tapered photonic crystal structures. Orders of magnitude faster to solve, our approach can be used to optimize certain properties of the nanoscale cavity. Here we consider the case of a nanobeam cavity, for which the confinement results from the modulation of its width. The profile of the width is optimized in order to flatten the resonator dispersion profile (so that all modes are equally spaced in frequency). This result is particularly relevant for miniaturizing parametric generators of nonclassical light, optical nanocombs, and mode-locked laser sources. Our method can be easily extended to complex geometries, described by multiple parameters.
Journal/Review: PHYSICAL REVIEW A
Volume: 106 (2) Pages from: 023505-1 to: 023505-9
KeyWords: inverse design; simulation; nanocavity; solitons; scale; laserDOI: 10.1103/PhysRevA.106.023505