title: Tunable delay line with interacting whispering-gallery-mode resonators.
abstract: We theoretically study a parallel configuration of two interacting whispering-gallery-mode optical resonators and show a narrowband modal structure as a basis for a widely tunable delay line. For the optimum coupling configuration the system can possess an unusually narrow spectral feature with a much narrower bandwidth than the loaded bandwidth of each individual resonator. The effect has a direct analogy with the phenomenon of electromagnetically induced transparency in quantum systems for which the interference of spontaneous emission results in ultranarrow resonances.
authors.affiliation: Jet Propulsion Laboratory, California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109-8099, USA.
authors.forename: L
authors.initials: L
authors.lastname: Maleki
authors.forename: A B
authors.initials: AB
authors.lastname: Matsko
authors.forename: A A
authors.initials: AA
authors.lastname: Savchenkov
authors.forename: V S
authors.initials: VS
authors.lastname: Ilchenko