Slow thermo-optomechanical pulsations in suspended one-dimensional photonic crystal nanocavities
Authors: Fonseca P., Alda I., Marino F., Cuadrado A., D’Ambrosio V., Gieseler J., Quidant R.
Autors Affiliation: ICFO – Institut de Ciències Fotòniques, Mediterranean Technology Park, 08860 Castelldefels, Barcelona, Spain; Istituto Nazionale di Ottica, Via Sansone 1, I-50019 Sesto Fiorentino, Florence, Italy; Escuela de Ciencias Experimentales y Tecnología, University Rey Juan Carlos, Móstoles, 28933, Madrid, Spain; Dipartimento di Fisica, Università di Napoli Federico II, Complesso Universitario di Monte S. Angelo, Via Cintia, 80126 Napoli, Italy; ICREA – Institució Catalana de Recerca i Estudis Avançats, 08010 Barcelona, Spain; Nanophotonic Systems Laboratory, Department of Mechanical and Process Engineering, ETH Zurich, 8092 Zurich, Switzerland.
Abstract: We investigate the nonlinear optical response of suspended one-dimensional (1D) photonic crystal nanocavities fabricated on a silicon nitride chip. Strong thermo-optical nonlinearities are demonstrated for input powers as low as 2 μW and a self-sustained pulsing regime is shown to emerge with periodicity of several seconds. As the input power and laser wavelength are varied the temporal patterns change in period, duty cycle, and shape. This dynamics is attributed to the multiple timescale competition between thermo-optical and thermo-optomechanical effects and closely resembles the relaxation oscillations states found in mathematical models of neuronal activity. We introduce a simplified model that reproduces all the experimental observations and allows us to explain them in terms of the properties of a 1D critical manifold which governs the slow evolution of the system.
Journal/Review: PHYSICAL REVIEW A
Volume: 102 (5) Pages from: 053518-1 to: 053518-8