title: Trimming of high-Q-factor silicon ring resonators by electron beam bleaching.
abstract: We demonstrate a novel position-resolved resonance trimming strategy for silicon ring resonators. Ring resonators are covered with a chromophore-doped guest host polymer cladding. Illumination of the polymer cladding with high-energy electrons causes a bleaching of the chromophore molecules. Bleaching of the chromophores induces a reduction of the polymer refractive index, which can be used to trim the resonance frequency of the ring resonators. A maximum refractive index change of 0.06 and a TM polarization resonance shift of 16.4 nm have been measured. A Q factor of 20,000 before bleaching remains unaltered after the electron beam exposure process.
authors.affiliation: Institute of Optical and Electronic Materials, Hamburg University of Technology, Hamburg, Germany. stefan.prorok@tu‑harburg.de
authors.forename: Stefan
authors.initials: S
authors.lastname: Prorok
authors.forename: Alexander Yu
authors.initials: AY
authors.lastname: Petrov
authors.forename: Manfred
authors.initials: M
authors.lastname: Eich
authors.forename: Jingdong
authors.initials: J
authors.lastname: Luo
authors.forename: Alex K-Y
authors.initials: AK
authors.lastname: Jen