title: Many-element coupled-resonator optical waveguides using gapless-coupled microdisk resonators.
abstract: We report silicon photonic many-element coupled-resonator optical waveguides (CROWs) using microspiral and double-notch-shaped microdisk resonators. Such microresonators enable gapless inter-cavity coupling via seamlessly jointed sub-micrometer-sized notches. Our experiments reveal CROW transmission spectra using up to 101 gaplessly coupled microdisk resonators. We estimate from the transmission measurements an insertion loss of approximately 0.11-approximately 0.24 dB/disk within the transmission bands. We show high-order filtering performance with maximum 3-dB linewidth of approximately 2.5 nm and measurement-limited side-mode suppression ratio of approximately 30 dB. The demonstrated maximum optical delay from a 101-element 0.4-microm-notch CROW is approximately 70 ps at the transmission band center and approximately 110 ps at the sideband.
authors.affiliation: Photonic Device Laboratory, Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China.
authors.forename: Xianshu
authors.initials: X
authors.lastname: Luo
authors.forename: Andrew W
authors.initials: AW
authors.lastname: Poon
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008904:Miniaturization; D055096:Optical Devices; D012031:Refractometry / Q000295:instrumentation*; D014159:Transducers; D014732:Vibration