Integrated Ring Resonators: A Compendium

1. Introduction2. Ring Resonators: Theory and Modeling2.1 Single Ring Resonators2.1.1 Ring Structure2.1.2 Racetrack Shaped Resonators2.2 Double Ring Resonators2.2.1 Serially Coupled Double Ring Resonator2.2.2 Parallel Coupled Double Ring Resonator2.3 Multiple Coupled Resonators2.3.1 Serially Coupled Ring Resonators2.3.2 Parallel Coupled Ring Resonators3. Materials, Fabrication and Characterization Methods3.1 Wafer Bonding3.1.1 Bonding with Intermediate Layer3.1.2 Bonding without Intermediate Layer3.1.3 Benzocyclobutene (BCB) Wafer Bonding3.2 Dry Etching3.3 Si based Materials3.3.1 Ring Resonators based on Si-SiO23.3.2 Ring Resonators based on Ta2O5-SiO23.3.3 Ring Resonators based on SiN, SiON and Si3N43.3.4 Ring Resonators based on SiO2-GeO23.4 III-V Materials3.4.1 The Quaternary Semiconductor Compound GaInAsP3.4.2 The Semiconductor Compound AlGaAs3.4.3 Lateral Coupling in GaInAsP/InP3.4.4 Vertical Coupling in GaInAsP/InP3.4.5 Lateral Coupling in AlGaAs/GaAs3.4.6 Vertical Coupling in AlGaAs/GaAs3.4.7 Implementation of Gain in Ring Resonators3.5 Polymers3.5.1 Conventional Fabrication Techniques3.5.2 Replication and Nanoimprinting3.5.3 Novel Polymer Devices3.6 Temperature Insensitivity3.7 Polarization Independence3.8 Characterization Methods3.8.1 Conventional Characterization3.8.2 Optical Low Coherence Reflectometry (OLCR)3.8.3 Evanescent Field Measurement Methods3.9 Lithium niobate and hydrid solutions3.9.1 Ring Resonators based on Lithium niobate3.9.2 Ring Resonators based on Lithium niobate on Insulators ( LNOI)3.9.3 Ring Resonators based on Lithium niobate in hybrid configurations with nitrides4. Building Blocks of Ring Resonator Devices4.1 Couplers4.1.1 Directional Couplers4.1.2 Multimode Interference Couplers4.1.3 Y-Couplers4.2 Bends4.3 Spot Size Converters for Light In- and Outcoupling4.4 Gratings for Light In- and Outcoupling5. Devices & Applications5.1 Filters5.1.1 Passive Devices5.1.2 Devices with gain section5.2 Tunability Methods5.2.1 Wavelength Tuning5.2.2 Center Wavelength Trimming5.2.3 Tunable Couplers in Ring Resonators5.3 Dispersion Compensators5.4 Mach-Zehnder combined with Ring Resonator5.5 Modulators5.6 Lasers5.6.1 All Active Lasers5.6.2 Devices with gain section5.6.3 Passive Ring Resonator Coupled Lasers5.7 Wavelength Converters5.8 Optical Signal Processing5.8.1 Logic Gates5.8.2 Switching5.8.3 Telecom Operations6. Sensors6.1 Microfluidics6.2 Optofluidics6.3 Biosensors7. Whispering Gallery Mode Devices7.1 Whispering Gallery Modes (WGM)7.2 WGM Filters7.3 WGM Lasers7. OutlookReferencesIndex