Author Affiliations
1School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an, Shaanxi 710129, China2Shaanxi Key Laboratory of Optical Information Technology, Northwestern Polytechnical University, Xi'an, Shaanxi 710129, China3Key Laboratory of Light Field Manipulation and Information Acquisition, Ministry of Industry and Information Technology, Northwestern Polytechnical University, Xi'an, Shaanxi 710129, Chinashow less
Fig. 1. Resonance mode in optical cavity. (a) Circulation of light wave in a Fabry-Pérot cavity; (b) intensity of the resonant mode; (c) phase of the resonance mode
Fig. 2. Transmission spectra and lightwave coupling in the coupled waveguide-microring resonator. (a) Schematic of transmission spectra from the ‘Through’ and ‘Drop’ ports of the waveguides coupled with the microring resonator; (b) lightwave coupling between waveguide and microring resonator
Fig. 3. Different resonance lineshapes of microring resonators. (a) Structure and corresponding spectra of channel waveguide coupled with multiple microring cavities
[3]; (b) structure and corresponding spectra of two microrings coupling
[4] Fig. 4. Fano resonance lineshapes with different q factors
Fig. 5. Analysis of resonance lineshape in traditional coupled waveguide-microring resonator. (a) Optical field distribution of resonant mode, guided wave mode, and coupling mode in traditional waveguide-microring resonator coupling structure
[20]; (b) transmission spectrum in traditional waveguide-microring resonator coupling structure
Fig. 6. Analysis of resonance lineshape in waveguide-microring coupling structure with extra phase delay. (a) Optical field analysis of microring resonant mode, waveguide guided mode, and their coupling mode
[20]; (b) modulation of transmission spectrum resonance lineshape of waveguide-microring cavity coupling structure by extra phase delay
Fig. 7. Experimental realization of different resonance lineshapes in the coupled waveguide-microring resonators. (a) Schematic of the experimental design for realizing a phase delay on a waveguide-microring coupling structure; (b) optical microscope image of a fabricated waveguide-microring structure
[20]; (c) transmission spectra of the waveguide-microring structures without air-hole and with air-holes of different dimensions
[20] Fig. 8. Experimental verification of the modulated resonance lineshapes in the coupled waveguide-microring by the phase-delay. (a) Schematic of the device with an air-hole inside waveguide-microring coupling region; (b) schematic of the device with an air-hole outside waveguide-microring coupling region; (c) scanning electron microscope images and measured transmission spectra of the waveguide-microring device with the air-hole locating at different positions
[21] Fig. 9. Mode analysis and structures for realizing asymmetric Fano resonance lineshapes in microring resonators. (a) Device of a microring cavity coupled with one arm of Mach-Zehnder interferometer
[23]; (b) device of a microring cavity inserted in a Mach-Zehnder interferometer
[24]; (c) device of a microring cavity coupled with a feedback waveguide
[25]; (d) schematic of microring cavity coupled with one arm of Mach-Zehnder interferometer and mode coupling analysis
Fig. 10. Analysis of different resonance lineshapes from two coupled optical resonators. (a) Schematic of the coupled structure between a channel waveguide and two optical cavities; (b) spectral feature of two overlapped resonance modes with different Q factors; (c) resonance lineshapes of two overlapped resonance mode with different Q factors when their resonance wavelengths have different relative locations