Open AccessCMOS-compatible compact optical isolator based on space-time modulated coupled resonators
Author(s) -
Adam Mock
Publication year - 2022
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.473927
Subject(s) - resonator , optics , materials science , phase modulation , insertion loss , isolator , cmos , silicon photonics , optical isolator , photonic crystal , optoelectronics , photonic integrated circuit , coupled mode theory , photonics , physics , electronic engineering , phase noise , refractive index , optical fiber , engineering
This work shows how phase-shifted time-modulations applied to two or more near-field coupled resonators can be engineered to achieve magnet-free optical isolation in a compact footprint. Because of the strong light-matter interaction afforded by high quality factor resonant cavities, only modest modulation amplitudes are required. A coupled mode theory model is developed which is subject to simulated annealing to optimize device performance. Then it is shown via finite-difference time-domain simulation how the device may be implemented in a one dimensional photonic crystal geometry etched in a silicon ridge waveguide. These devices can be implemented in native silicon with standard electrical contacts thereby maintaining CMOS-compatible fabrication without the need for additional specialized materials. Isolation ratios of over 40 dB with insertion loss less than 1 dB using modulation frequencies under 25 GHz are achievable in this device platform.