title: Positive and negative phototunability of chalcogenide (AMTIR-1) microdisk resonator.
abstract: We demonstrate externally photo-induced partially-reversible tuning of the resonance of a microdisk made of AMTIR-1 (Ge(33)As(12)Se(55)). We have achieved for the first time, to the best of our knowledge, both positive and negative shift in a microresonator with external tuning. A positive resonance shift of 1 nm and a negative resonance shift of 0.5 nm on a single microdisk has been measured. We have found that this phenomenon is due to initial photo-expansion of the microdisk followed by the photo-bleaching of the AMTIR-1. The observed shifts and the underlying phenomenon is controllable by varying the illumination power (i.e. the low power illumination suppresses the photobleaching process). We measure a loaded quality factor of 1.2x10(5) at 1550nm (limited by the measuring instrument). This holds promise for non-contact low power reversible-tunning of photonic circuit elements.
authors.forename: Neetesh
authors.initials: N
authors.lastname: Singh
authors.forename: Darren D
authors.initials: DD
authors.lastname: Hudson
authors.forename: Rongping
authors.initials: R
authors.lastname: Wang
authors.forename: Eric C
authors.initials: EC
authors.lastname: Mägi
authors.forename: Duk-Yong
authors.initials: DY
authors.lastname: Choi
authors.forename: Christian
authors.initials: C
authors.lastname: Grillet
authors.forename: Barry
authors.initials: B
authors.lastname: Luther-Davies
authors.forename: Stephen
authors.initials: S
authors.lastname: Madden
authors.forename: Benjamin J
authors.initials: BJ
authors.lastname: Eggleton